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Prof. Luciano Lamberti
Politecnico di Bari - DMMM

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0 Experimental Mechanics
0 Structural Optimization
0 Optical methods
0 Bioengineering and Biomechanics
0 Nanoscience and Nanotechnology

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Experimental Mechanics
Structural Optimization
Optical methods

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Editorial
Published: 23 April 2021 in Materials
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Materials can be considered the backbone of all technological applications

ACS Style

Luciano Lamberti. In Situ TEM and AFM for Investigation of Materials. Materials 2021, 14, 2140 .

AMA Style

Luciano Lamberti. In Situ TEM and AFM for Investigation of Materials. Materials. 2021; 14 (9):2140.

Chicago/Turabian Style

Luciano Lamberti. 2021. "In Situ TEM and AFM for Investigation of Materials." Materials 14, no. 9: 2140.

Journal article
Published: 06 April 2021 in Applied Sciences
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Metaheuristic algorithms currently represent the standard approach to engineering optimization. A very challenging field is large-scale structural optimization, entailing hundreds of design variables and thousands of nonlinear constraints on element stresses and nodal displacements. However, very few studies documented the use of metaheuristic algorithms in large-scale structural optimization. In order to fill this gap, an enhanced hybrid harmony search (HS) algorithm for weight minimization of large-scale truss structures is presented in this study. The new algorithm, Large-Scale Structural Optimization–Hybrid Harmony Search JAYA (LSSO-HHSJA), developed here, combines a well-established method like HS with a very recent method like JAYA, which has the simplest and inherently most powerful search engine amongst metaheuristic optimizers. All stages of LSSO-HHSJA are aimed at reducing the number of structural analyses required in large-scale structural optimization. The basic idea is to move along descent directions to generate new trial designs, directly through the use of gradient information in the HS phase, indirectly by correcting trial designs with JA-based operators that push search towards the best design currently stored in the population or the best design included in a local neighborhood of the currently analyzed trial design. The proposed algorithm is tested in three large-scale weight minimization problems of truss structures. Optimization results obtained for the three benchmark examples, with up to 280 sizing variables and 37,374 nonlinear constraints, prove the efficiency of the proposed LSSO-HHSJA algorithm, which is very competitive with other HS and JAYA variants as well as with commercial gradient-based optimizers.

ACS Style

Sadik Degertekin; Mohammad Minooei; Lorenzo Santoro; Bartolomeo Trentadue; Luciano Lamberti. Large-Scale Truss-Sizing Optimization with Enhanced Hybrid HS Algorithm. Applied Sciences 2021, 11, 3270 .

AMA Style

Sadik Degertekin, Mohammad Minooei, Lorenzo Santoro, Bartolomeo Trentadue, Luciano Lamberti. Large-Scale Truss-Sizing Optimization with Enhanced Hybrid HS Algorithm. Applied Sciences. 2021; 11 (7):3270.

Chicago/Turabian Style

Sadik Degertekin; Mohammad Minooei; Lorenzo Santoro; Bartolomeo Trentadue; Luciano Lamberti. 2021. "Large-Scale Truss-Sizing Optimization with Enhanced Hybrid HS Algorithm." Applied Sciences 11, no. 7: 3270.

Journal article
Published: 15 March 2021 in Solar Energy
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The solar cooker represents a challenging scientific design. Its non-regular rechargeable system and the restriction imposed by the required availability quantity are the main issues. The use of a bar plate coated with nanolayer materials helps to stimulate and control the multifaceted performances for the cooker vessels. Further, it was noted that the traditional human methods are not capable to stimulate an efficient design for thermal applications, because the environment cannot adapt to the variable source. To overcome these challenges, we have used the approaches of adaptive neural network-based controls which further consider other parameters as the smaller family, measured conjunction, enormous period of feeding and below performances. Therefore, a novel solar cooker based on adaptive control through an online Sequential Extreme Learning Machine (OSELM) is presented and discussed. The use of OSELM enables also to detect an off-line physical activity process. The proposed solar cooker includes a bar plate coated with nanolayer materials (SiO2/TiO2 nanoparticles) which is responsible for physical accelerated activity of energy absorption. The feasibility scheme to validate this study is based on the calculation of extensive heat transfer process. By using the furious SiO2/TiO2 nanoparticles for the Stepped solar bar plate cooker (SSBC) the efficiency was increased by 37.69% and 49.21% using 10% and 15% volume fractions of nanoparticles.

ACS Style

P. Thamizharasu; S. Shanmugan; S. Sivakumar; Catalin I. Pruncu; A.E. Kabeel; J. Nagaraj; Lakshmi Sarvani Videla; K. Vijai Anand; L. Lamberti; Meena Laad. Revealing an OSELM based on traversal tree for higher energy adaptive control using an efficient solar box cooker. Solar Energy 2021, 218, 320 -336.

AMA Style

P. Thamizharasu, S. Shanmugan, S. Sivakumar, Catalin I. Pruncu, A.E. Kabeel, J. Nagaraj, Lakshmi Sarvani Videla, K. Vijai Anand, L. Lamberti, Meena Laad. Revealing an OSELM based on traversal tree for higher energy adaptive control using an efficient solar box cooker. Solar Energy. 2021; 218 ():320-336.

Chicago/Turabian Style

P. Thamizharasu; S. Shanmugan; S. Sivakumar; Catalin I. Pruncu; A.E. Kabeel; J. Nagaraj; Lakshmi Sarvani Videla; K. Vijai Anand; L. Lamberti; Meena Laad. 2021. "Revealing an OSELM based on traversal tree for higher energy adaptive control using an efficient solar box cooker." Solar Energy 218, no. : 320-336.

Journal article
Published: 05 March 2021 in Materials
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This article presents a very detailed study on the mechanical characterization of a highly nonlinear material, the immature equine zona pellucida (ZP) membrane. The ZP is modeled as a visco-hyperelastic soft matter. The Arruda–Boyce constitutive equation and the two-term Prony series are identified as the most suitable models for describing the hyperelastic and viscous components, respectively, of the ZP’s mechanical response. Material properties are identified via inverse analysis based on nonlinear optimization which fits nanoindentation curves recorded at different rates. The suitability of the proposed approach is fully demonstrated by the very good agreement between AFM data and numerically reconstructed force–indentation curves. A critical comparison of mechanical behavior of two immature ZP membranes (i.e., equine and porcine ZPs) is also carried out considering the information on the structure of these materials available from electron microscopy investigations documented in the literature.

ACS Style

Elisa Ficarella; Mohammad Minooei; Lorenzo Santoro; Elisabetta Toma; Bartolomeo Trentadue; Marco De Spirito; Massimiliano Papi; Catalin Pruncu; Luciano Lamberti. Visco-Hyperelastic Characterization of the Equine Immature Zona Pellucida. Materials 2021, 14, 1223 .

AMA Style

Elisa Ficarella, Mohammad Minooei, Lorenzo Santoro, Elisabetta Toma, Bartolomeo Trentadue, Marco De Spirito, Massimiliano Papi, Catalin Pruncu, Luciano Lamberti. Visco-Hyperelastic Characterization of the Equine Immature Zona Pellucida. Materials. 2021; 14 (5):1223.

Chicago/Turabian Style

Elisa Ficarella; Mohammad Minooei; Lorenzo Santoro; Elisabetta Toma; Bartolomeo Trentadue; Marco De Spirito; Massimiliano Papi; Catalin Pruncu; Luciano Lamberti. 2021. "Visco-Hyperelastic Characterization of the Equine Immature Zona Pellucida." Materials 14, no. 5: 1223.

Journal article
Published: 21 January 2021 in Materials
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Polycrystalline cubic boron nitride (PcBN) are super-hard materials with high hardness and excellent abrasive resistance, widely used in cutting tools for precision machining of automotive and aerospace parts; however, their brittle properties make them prone to premature failure. Coatings are often applied to PcBN to extend their range of applicability and durability. Conventional coating methods are limited to the thickness range of a few hundred nanometres, poor adhesion to the substrate, and limited stability under ambient conditions. To further the properties of PcBN composites, in this paper, we explore the use of ultrasonic bonding to apply thick coatings (30–80 μm) on PcBN cutting tools. For the first time, a multi-walled carbon nanotube (MWCNT) powder is preplaced on a PcBN substrate to allow an unconventional coating technique to take place. The effects of ultrasonic bonding parameters on the change of mechanical properties of the coated tools are investigated through scanning electron microscopy (SEM), energy dispersive X-Ray spectroscopy (EDX), micro-hardness analyses, and white light interferometry. The structure of the carbon nanotubes is investigated through transmission electron microscopy (pre coating) and cross-section of the bonded MWCNTs is studied via focused ion beam milling and SEM to evaluate the bonding between the multi-walled nanotubes. Optimum processing windows (i.e., bonding speed, energy, and pressure) are discovered for coating MWCNTs on PcBN. Focus ion beam milling analyses revealed a relationship between consolidation parameters and porosity of MW(pCNT) bonds. The proposed method paves the way for the novel design of functional coatings with attunable properties (i.e., thickness and hardness) and therefore improved productivity in the machining of aerospace and automotive parts.

ACS Style

Manuela Pacella; Sina Saremi-Yarahmadi; Luciano Lamberti. Ultrasonic Deposition of Carbon Nanotubes on Polycrystalline Cubic Boron Nitride Composites. Materials 2021, 14, 516 .

AMA Style

Manuela Pacella, Sina Saremi-Yarahmadi, Luciano Lamberti. Ultrasonic Deposition of Carbon Nanotubes on Polycrystalline Cubic Boron Nitride Composites. Materials. 2021; 14 (3):516.

Chicago/Turabian Style

Manuela Pacella; Sina Saremi-Yarahmadi; Luciano Lamberti. 2021. "Ultrasonic Deposition of Carbon Nanotubes on Polycrystalline Cubic Boron Nitride Composites." Materials 14, no. 3: 516.

Journal article
Published: 21 November 2020 in Computers & Structures
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Computational efficiency of metaheuristic optimization algorithms depends on appropriate balance between exploration and exploitation. An important concern in metaheuristic optimization is that there is no guarantee that new trial designs will always improve the current best record. In this regard, there not exist any metaheuristic algorithm inherently superior over all other methods. This study compares three advanced formulations of state-of-the-art metaheuristic optimization algorithms – Simulated Annealing (SA), Harmony Search (HS) and Big Bang-Big Crunch (BBBC) – including enhanced approximate line search and computationally cheap gradient evaluation strategies. The rationale behind the new formulations is to generate high quality trial designs lying on a properly chosen set of descent directions. This is done throughout the optimization process. Besides hybridizing the metaheuristic search engines of HS/BBBC/SA with gradient information and approximate line search, HS and BBBC are also hybridized with an enhanced 1-D probabilistic search derived from SA. All these enhancements allow to approach more quickly the region of design space hosting the global optimum. The new algorithms are tested in four weight minimization problems of skeletal structures and three mechanical/civil engineering design problems with up to 204 continuous/discrete variables and 20,070 nonlinear constraints. All test problems may contain multiple local minima. The optimization results and an extensive comparison with the literature clearly demonstrate the validity of the proposed approach which allows to significantly reduce the number of function evaluations/structural analyses with respect to the literature and improves robustness of metaheuristic search engines.

ACS Style

E. Ficarella; L. Lamberti; S.O. Degertekin. Comparison of three novel hybrid metaheuristic algorithms for structural optimization problems. Computers & Structures 2020, 244, 106395 .

AMA Style

E. Ficarella, L. Lamberti, S.O. Degertekin. Comparison of three novel hybrid metaheuristic algorithms for structural optimization problems. Computers & Structures. 2020; 244 ():106395.

Chicago/Turabian Style

E. Ficarella; L. Lamberti; S.O. Degertekin. 2020. "Comparison of three novel hybrid metaheuristic algorithms for structural optimization problems." Computers & Structures 244, no. : 106395.

Review
Published: 13 October 2020 in Nanomaterials
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One of the most important ideas ever produced by the application of materials science to the medical field is the notion of biomaterials. The nanostructured biomaterials play a crucial role in the development of new treatment strategies including not only the replacement of tissues and organs, but also repair and regeneration. They are designed to interact with damaged or injured tissues to induce regeneration, or as a forest for the production of laboratory tissues, so they must be micro-environmentally sensitive. The existing materials have many limitations, including impaired cell attachment, proliferation, and toxicity. Nanotechnology may open new avenues to bone tissue engineering by forming new assemblies similar in size and shape to the existing hierarchical bone structure. Organic and inorganic nanobiomaterials are increasingly used for bone tissue engineering applications because they may allow to overcome some of the current restrictions entailed by bone regeneration methods. This review covers the applications of different organic and inorganic nanobiomaterials in the field of hard tissue engineering.

ACS Style

Pawan Kumar; Meenu Saini; Brijnandan S. Dehiya; Anil Sindhu; Vinod Kumar; Ravinder Kumar; Luciano Lamberti; Catalin I. Pruncu; Rajesh Thakur. Comprehensive Survey on Nanobiomaterials for Bone Tissue Engineering Applications. Nanomaterials 2020, 10, 2019 .

AMA Style

Pawan Kumar, Meenu Saini, Brijnandan S. Dehiya, Anil Sindhu, Vinod Kumar, Ravinder Kumar, Luciano Lamberti, Catalin I. Pruncu, Rajesh Thakur. Comprehensive Survey on Nanobiomaterials for Bone Tissue Engineering Applications. Nanomaterials. 2020; 10 (10):2019.

Chicago/Turabian Style

Pawan Kumar; Meenu Saini; Brijnandan S. Dehiya; Anil Sindhu; Vinod Kumar; Ravinder Kumar; Luciano Lamberti; Catalin I. Pruncu; Rajesh Thakur. 2020. "Comprehensive Survey on Nanobiomaterials for Bone Tissue Engineering Applications." Nanomaterials 10, no. 10: 2019.

Journal article
Published: 16 April 2020 in Materials
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In this study, natural deposits of Kankara kaolin clay were collected and investigated in order to determine physical, microstructural, thermal, and firing properties and assess clay’s suitability as starting material for various ceramic applications. Chemical analysis of the clay was performed using XRF. Mineralogical analysis and thermal analysis of the clay were conducted using XRD and thermogravimetric thermal analysis (TGA)/differential thermal analysis (DTA), respectively. In order to assess its ceramic behavior, the clay was fired at 900–1200 °C. Maturation characteristics of fired ceramics were assessed by measuring bulk density, apparent porosity, and shrinkage. It was found that main oxides in the clay are alumina, silica, and potassium oxide, while other oxides are present in trace quantities. Kaolinite, quartz, and illite are the phases found from the XRD results, while mullite ceramic phase formed at firing temperature above 1100 °C. Maturation tests showed that ceramic properties such as bulk density and shrinkage increase with temperature, while apparent porosity decreases with temperature. The results presented in this study prove that the clay is an appropriate material for producing traditional ceramics.

ACS Style

Muazu Abubakar; Ayyankalai Muthuraja; Dipen Kumar Rajak; Norhayati Ahmad; Catalin I. Pruncu; Luciano Lamberti; Ashwini Kumar. Influence of Firing Temperature on the Physical, Thermal and Microstructural Properties of Kankara Kaolin Clay: A Preliminary Investigation. Materials 2020, 13, 1872 .

AMA Style

Muazu Abubakar, Ayyankalai Muthuraja, Dipen Kumar Rajak, Norhayati Ahmad, Catalin I. Pruncu, Luciano Lamberti, Ashwini Kumar. Influence of Firing Temperature on the Physical, Thermal and Microstructural Properties of Kankara Kaolin Clay: A Preliminary Investigation. Materials. 2020; 13 (8):1872.

Chicago/Turabian Style

Muazu Abubakar; Ayyankalai Muthuraja; Dipen Kumar Rajak; Norhayati Ahmad; Catalin I. Pruncu; Luciano Lamberti; Ashwini Kumar. 2020. "Influence of Firing Temperature on the Physical, Thermal and Microstructural Properties of Kankara Kaolin Clay: A Preliminary Investigation." Materials 13, no. 8: 1872.

Original article
Published: 05 March 2020 in Engineering with Computers
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The performance-based optimum seismic design of steel frames is one of the most complicated and computationally demanding structural optimization problems. Metaheuristic optimization methods have been successfully used for solving engineering design problems over the last three decades. A very recently developed metaheuristic method called school-based optimization (SBO) will be utilized in the performance-based optimum seismic design of steel frames for the first time in this study. The SBO actually is an improved/enhanced version of teaching–learning-based optimization (TLBO), which mimics the teaching and learning process in a class where learners interact with the teacher and between themselves. Ad hoc strategies are adopted in order to minimize the computational cost of SBO results. The objective of the optimization problem is to minimize the weight of steel frames under interstory drift and strength constraints. Three steel frames previously designed by different metaheuristic methods including particle swarm optimization, improved quantum particle swarm optimization, firefly and modified firefly algorithms, teaching–learning-based optimization, and JAYA algorithm are used as benchmark optimization examples to verify the efficiency and robustness of the present SBO algorithm. Optimization results are compared with those of other state-of-the-art metaheuristic algorithms in terms of minimum structural weight, convergence speed, and several statistical parameters. Remarkably, in all test problems, SBO finds lighter designs with less computational effort than the TLBO and other methods available in metaheuristic optimization literature.

ACS Style

S. O. Degertekin; H. Tutar; L. Lamberti. School-based optimization for performance-based optimum seismic design of steel frames. Engineering with Computers 2020, 1 -15.

AMA Style

S. O. Degertekin, H. Tutar, L. Lamberti. School-based optimization for performance-based optimum seismic design of steel frames. Engineering with Computers. 2020; ():1-15.

Chicago/Turabian Style

S. O. Degertekin; H. Tutar; L. Lamberti. 2020. "School-based optimization for performance-based optimum seismic design of steel frames." Engineering with Computers , no. : 1-15.

Journal article
Published: 22 December 2019 in Materials
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The general goal of the study is to connect theoretical predictions of continuum mechanics with actual experimental observations that support these predictions. The representative volume element (RVE) bridges the theoretical concept of continuum with the actual discontinuous structure of matter. This paper presents an experimental verification of the RVE concept. Foundations of continuum kinematics as well as mathematical functions relating displacement vectorial fields to the recording of these fields by a light sensor in the form of gray-level scalar fields are reviewed. The Eulerian derivative field tensors are related to the deformation of the continuum: the Euler–Almansi tensor is extracted, and its properties are discussed. The compatibility between the Euler–Almansi tensor and the Cauchy stress tensor is analyzed. In order to verify the concept of the RVE, a multiscale analysis of an Al–SiC composite material is carried out. Furthermore, it is proven that the Euler–Almansi strain tensor and the Cauchy stress tensor are conjugate in the Hill–Mandel sense by solving an identification problem of the constitutive model of urethane rubber.

ACS Style

Cesar A. Sciammarella; Luciano Lamberti; Federico M. Sciammarella. Verification of Continuum Mechanics Predictions with Experimental Mechanics. Materials 2019, 13, 77 .

AMA Style

Cesar A. Sciammarella, Luciano Lamberti, Federico M. Sciammarella. Verification of Continuum Mechanics Predictions with Experimental Mechanics. Materials. 2019; 13 (1):77.

Chicago/Turabian Style

Cesar A. Sciammarella; Luciano Lamberti; Federico M. Sciammarella. 2019. "Verification of Continuum Mechanics Predictions with Experimental Mechanics." Materials 13, no. 1: 77.

Conference paper
Published: 10 November 2019 in Conference Proceedings of the Society for Experimental Mechanics Series
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The most abundant component of the human umbilical cord, the Wharton Jelly (WJ), is a mucous connective tissue consisting in a spongy network of interlacing collagen fibers that forms a continuous soft skeleton encasing umbilical vessels. The link between WJ structure and the pivotal cord function in providing unimpeded blood flow to the developing fetus is still poorly understood. We performed an advanced biomechanical characterization of human umbilical cord samples by planar equibiaxial tension tests. The intrinsic moiré technique was utilized for that purpose. A 3-D finite element analysis was then implemented to simulate the biomechanical response of the cord.

ACS Style

Roberto Brunelli; Massimiliano Papi; Tiziana Parasassi; Marco De Spirito; Carmine Pappalettere; Luciano Lamberti. On the Role of Human Umbilical Cord Biomechanics. Conference Proceedings of the Society for Experimental Mechanics Series 2019, 81 -86.

AMA Style

Roberto Brunelli, Massimiliano Papi, Tiziana Parasassi, Marco De Spirito, Carmine Pappalettere, Luciano Lamberti. On the Role of Human Umbilical Cord Biomechanics. Conference Proceedings of the Society for Experimental Mechanics Series. 2019; ():81-86.

Chicago/Turabian Style

Roberto Brunelli; Massimiliano Papi; Tiziana Parasassi; Marco De Spirito; Carmine Pappalettere; Luciano Lamberti. 2019. "On the Role of Human Umbilical Cord Biomechanics." Conference Proceedings of the Society for Experimental Mechanics Series , no. : 81-86.

Journal article
Published: 07 August 2019 in Optics Letters
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Optical gyroscopes measure the angular velocity using the Sagnac effect. However, the resonance splitting due to the Sagnac effect is directly proportional to the linear dimensions of the device. Consequently, integrated optical gyroscopes are still the subject of research. We propose the idea and the design of an anti-parity-time (APT)-symmetric optical gyroscope exhibiting a resonance splitting independent from the dimensions of the device. With a 80 μm×40 μm footprint integrated device, we demonstrated that it is possible to achieve a resonance splitting 106 times higher than the one obtained through the classical Sagnac effect. With respect to the previously proposed parity-time (PT)-symmetric gyroscope, our solution exhibits a real frequency splitting, directly measurable at the output power spectrum. Moreover, it can be kept at its exceptional point more accurately than the PT-symmetric counterpart. Finally, the anti-PT-symmetric gyroscope presented here can detect the sign of the angular velocity differently from the PT-symmetric one.

ACS Style

Martino De Carlo; Francesco De Leonardis; Luciano Lamberti; Vittorio M. N. Passaro. High-sensitivity real-splitting anti-PT-symmetric microscale optical gyroscope. Optics Letters 2019, 44, 3956 -3959.

AMA Style

Martino De Carlo, Francesco De Leonardis, Luciano Lamberti, Vittorio M. N. Passaro. High-sensitivity real-splitting anti-PT-symmetric microscale optical gyroscope. Optics Letters. 2019; 44 (16):3956-3959.

Chicago/Turabian Style

Martino De Carlo; Francesco De Leonardis; Luciano Lamberti; Vittorio M. N. Passaro. 2019. "High-sensitivity real-splitting anti-PT-symmetric microscale optical gyroscope." Optics Letters 44, no. 16: 3956-3959.

Journal article
Published: 02 July 2019 in Materials
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This study presents a hybrid framework for mechanical identification of materials and structures. The inverse problem is solved by combining experimental measurements performed by optical methods and non-linear optimization using metaheuristic algorithms. In particular, we develop three advanced formulations of Simulated Annealing (SA), Harmony Search (HS) and Big Bang-Big Crunch (BBBC) including enhanced approximate line search and computationally cheap gradient evaluation strategies. The rationale behind the new algorithms-denoted as Hybrid Fast Simulated Annealing (HFSA), Hybrid Fast Harmony Search (HFHS) and Hybrid Fast Big Bang-Big Crunch (HFBBBC)-is to generate high quality trial designs lying on a properly selected set of descent directions. Besides hybridizing SA/HS/BBBC metaheuristic search engines with gradient information and approximate line search, HS and BBBC are also hybridized with an enhanced 1-D probabilistic search derived from SA. The results obtained in three inverse problems regarding composite and transversely isotropic hyperelastic materials/structures with up to 17 unknown properties clearly demonstrate the validity of the proposed approach, which allows to significantly reduce the number of structural analyses with respect to previous SA/HS/BBBC formulations and improves robustness of metaheuristic search engines.

ACS Style

Elisa Ficarella; Luciano Lamberti; Sadik Ozgur Degertekin. Mechanical Identification of Materials and Structures with Optical Methods and Metaheuristic Optimization. Materials 2019, 12, 2133 .

AMA Style

Elisa Ficarella, Luciano Lamberti, Sadik Ozgur Degertekin. Mechanical Identification of Materials and Structures with Optical Methods and Metaheuristic Optimization. Materials. 2019; 12 (13):2133.

Chicago/Turabian Style

Elisa Ficarella; Luciano Lamberti; Sadik Ozgur Degertekin. 2019. "Mechanical Identification of Materials and Structures with Optical Methods and Metaheuristic Optimization." Materials 12, no. 13: 2133.

Journal article
Published: 03 June 2019 in Materials
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Macroscopic behavior of materials depends on interactions of atoms and molecules at nanometer/sub-nanometer scale. Experimental mechanics (EM) can be used for assessing relationships between the macro world and the atomic realm. Theoretical models developed at nanometric and sub-nanometric scales may be verified using EM techniques with the final goal of deriving comprehensive but manageable models. Recently, the authors have carried out studies on EM determination of displacements and their derivatives at the macro and microscopic scales. Here, these techniques were applied to the analysis of high-resolution transmission electron microscopy patterns of a crystalline array containing dislocations. Utilizing atomic positions as carriers of information and comparing undeformed and deformed configurations of observed area, displacements and their derivatives, as well as stresses, have been obtained in the Eulerian description of deformed crystal. Two approaches are introduced. The first establishes an analogy between the basic crystalline structure and a 120° strain gage rosette. The other relies on the fact that, if displacement information along three directions is available, it is possible to reconstruct the displacement field; all necessary equations are provided in the paper. Remarkably, the validity of the Cauchy-Born conjecture is proven to be correct within the range of observed deformations.

ACS Style

Cesar A. Sciammarella; Federico M. Sciammarella; Luciano Lamberti. Determination of Displacement Fields at the Sub-Nanometric Scale. Materials 2019, 12, 1804 .

AMA Style

Cesar A. Sciammarella, Federico M. Sciammarella, Luciano Lamberti. Determination of Displacement Fields at the Sub-Nanometric Scale. Materials. 2019; 12 (11):1804.

Chicago/Turabian Style

Cesar A. Sciammarella; Federico M. Sciammarella; Luciano Lamberti. 2019. "Determination of Displacement Fields at the Sub-Nanometric Scale." Materials 12, no. 11: 1804.

Journal article
Published: 14 December 2018 in Optics and Lasers in Engineering
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In preceding publications, the authors have analyzed different aspects of the recovery of displacement information encoded in scalar fields of gray levels. The signals that contain displacement information can be generated by different optical methods or can be computer generated, for example, in the images of the magnetic resonance method (MRI). This paper merges ideas of the authors’ previous developments, included in the manuscript references, with new developments. These developments simplify fundamental basic steps of the process of retrieving displacement information. They also extend the applicability of basic algorithms to a very diverse variety of patterns, including patterns that contain displacement singularities. Singularities in displacement fields indicate departures of the standard continuity conditions assumed in the mathematical model of Continuum Mechanics, these discontinuities can be local or can divide the field into piecewise continuous regions. To illustrate the practical aspect of these derivations the proposed methodology is applied to very complex patterns. The analysis of these patterns with standard techniques will require complex and time-consuming pattern processing procedures. In the approach presented in this paper, the same task can be accomplished by a much simpler and general scheme.

ACS Style

Cesar A. Sciammarella; Luciano Lamberti; Federico M. Sciammarella. The optical signal analysis (OSA) method to process fringe patterns containing displacement information. Optics and Lasers in Engineering 2018, 115, 225 -237.

AMA Style

Cesar A. Sciammarella, Luciano Lamberti, Federico M. Sciammarella. The optical signal analysis (OSA) method to process fringe patterns containing displacement information. Optics and Lasers in Engineering. 2018; 115 ():225-237.

Chicago/Turabian Style

Cesar A. Sciammarella; Luciano Lamberti; Federico M. Sciammarella. 2018. "The optical signal analysis (OSA) method to process fringe patterns containing displacement information." Optics and Lasers in Engineering 115, no. : 225-237.

Journal article
Published: 01 May 2018 in Optics and Lasers in Engineering
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ACS Style

Cesar A. Sciammarella; Luciano Lamberti. Determination of displacements and their derivatives from 3D fringe patterns via extended monogenic phasor method. Optics and Lasers in Engineering 2018, 104, 117 -125.

AMA Style

Cesar A. Sciammarella, Luciano Lamberti. Determination of displacements and their derivatives from 3D fringe patterns via extended monogenic phasor method. Optics and Lasers in Engineering. 2018; 104 ():117-125.

Chicago/Turabian Style

Cesar A. Sciammarella; Luciano Lamberti. 2018. "Determination of displacements and their derivatives from 3D fringe patterns via extended monogenic phasor method." Optics and Lasers in Engineering 104, no. : 117-125.

Articles
Published: 01 March 2017 in Latin American Journal of Solids and Structures
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Heat transfer search (HTS) is a novel metaheuristic optimization algorithm that simulates the laws of thermodynamics and heat transfer. In this study, the HTS algorithm is adapted to truss structure optimization. Sizing optimization searches for the minimum weight of a structure subject to stress and displacement constraints. Three truss structures often taken as benchmarks in the optimization literature are selected here in order to verify the efficiency and robustness of the HTS algorithm. Optimization results indicate that HTS can obtain better designs (i.e. lighter trusses) than most of the state-of-the-art metaheuristic optimizers. The convergence behaviour of HTS also is as good as the other algorithms.

ACS Style

S.O. Degertekin; L. Lamberti; M.S. Hayalioglu. Heat Transfer Search Algorithm for Sizing Optimization of Truss Structures. Latin American Journal of Solids and Structures 2017, 14, 373 -397.

AMA Style

S.O. Degertekin, L. Lamberti, M.S. Hayalioglu. Heat Transfer Search Algorithm for Sizing Optimization of Truss Structures. Latin American Journal of Solids and Structures. 2017; 14 (3):373-397.

Chicago/Turabian Style

S.O. Degertekin; L. Lamberti; M.S. Hayalioglu. 2017. "Heat Transfer Search Algorithm for Sizing Optimization of Truss Structures." Latin American Journal of Solids and Structures 14, no. 3: 373-397.

Book chapter
Published: 21 September 2016 in Conference Proceedings of the Society for Experimental Mechanics Series
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The usual assumption made in mechanical characterization of soft tissues with Atomic Force Microscopy (AFM) is that the specimen behaves as a purely elastic material. Recent investigations have shown that in the case of immature porcine zona pellucida (ZP) samples viscous effects become more significant for sharp tips. Interestingly, a linear relationship between the limit indentation rate and the geometry of the AFM probe was derived, which is similar to the relationship existing between hardness and radius of curvature of the indenter typically observed for elasto-plastic materials. This study will analyze soft biotissues with different elasticity and viscous properties showing different response to nanoindentation. The relationship between limit indentation rate and tip geometry will be derived for each material to confirm previous experimental observations.

ACS Style

E. Ficarella; L. Lamberti; Massimiliano Papi; Marco De Spirito; C. Pappalettere. Viscohyperelastic Calibration in Mechanical Characterization of Soft Matter. Conference Proceedings of the Society for Experimental Mechanics Series 2016, 33 -37.

AMA Style

E. Ficarella, L. Lamberti, Massimiliano Papi, Marco De Spirito, C. Pappalettere. Viscohyperelastic Calibration in Mechanical Characterization of Soft Matter. Conference Proceedings of the Society for Experimental Mechanics Series. 2016; ():33-37.

Chicago/Turabian Style

E. Ficarella; L. Lamberti; Massimiliano Papi; Marco De Spirito; C. Pappalettere. 2016. "Viscohyperelastic Calibration in Mechanical Characterization of Soft Matter." Conference Proceedings of the Society for Experimental Mechanics Series , no. : 33-37.

Book chapter
Published: 08 September 2016 in Conference Proceedings of the Society for Experimental Mechanics Series
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The extraction of the displacement field and its derivatives from fringe patterns entails the following steps: (1) information inscription; (2) data recovery; (3) data processing; (4) data analysis. Phase information is a powerful representation of the information contained in a signal. In a previous work, the above mentioned steps were formulated and discussed for a 1D signal, indicating that the extension to 2-D was a non trivial process. Proceeding along the same line of thought when one moves from the one dimension to two dimensions it is necessary to consider a 3D abstract space to generate the additional dimension that can handle the analysis of 2D signals and simultaneously extend the Hilbert transform to 2D. In this study the basic theory developed in the preceding reference is further elaborated to produce a version of the monogenic function yielding the necessary answers to the previously described processes. The monogenic signal, a 3D vector in a Cartesian complex space, is graphically represented by a Poincare sphere which provides a generalization of the Hilbert transform to a 2D version of what is called the generalized Hilbert transform or Riesz transform. These theoretical derivations are supported by the actual application of the theory and corresponding algorithms to 2D fringe patterns and by comparing the obtained results with known results.

ACS Style

C. A. Sciammarella; L. Lamberti. A General Mathematical Model to Retrieve Displacement Information from Fringe Patterns. Conference Proceedings of the Society for Experimental Mechanics Series 2016, 1 -24.

AMA Style

C. A. Sciammarella, L. Lamberti. A General Mathematical Model to Retrieve Displacement Information from Fringe Patterns. Conference Proceedings of the Society for Experimental Mechanics Series. 2016; ():1-24.

Chicago/Turabian Style

C. A. Sciammarella; L. Lamberti. 2016. "A General Mathematical Model to Retrieve Displacement Information from Fringe Patterns." Conference Proceedings of the Society for Experimental Mechanics Series , no. : 1-24.

Journal article
Published: 01 February 2016 in Optics and Lasers in Engineering
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ACS Style

Cesar A. Sciammarella; Luciano Lamberti. Mathematical models utilized in the retrieval of displacement information encoded in fringe patterns. Optics and Lasers in Engineering 2016, 77, 100 -111.

AMA Style

Cesar A. Sciammarella, Luciano Lamberti. Mathematical models utilized in the retrieval of displacement information encoded in fringe patterns. Optics and Lasers in Engineering. 2016; 77 ():100-111.

Chicago/Turabian Style

Cesar A. Sciammarella; Luciano Lamberti. 2016. "Mathematical models utilized in the retrieval of displacement information encoded in fringe patterns." Optics and Lasers in Engineering 77, no. : 100-111.