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Prof. Luigi Solazzi
Department of Mechanical and Industrial Engineering, University of Brescia, Italy

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0 Lifting Equipment
0 composite material
0 dynamic load
0 Experimental Tests
0 Dynamic Behaviour

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Crane
composite material
Experimental Tests
Finite element analyses
dynamic load
Lifting Equipment
Dynamic Behaviour
Structural vibration
Pressure vessel
Load movement
Impulse loading
Dynamic analyses

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Journal article
Published: 06 February 2021 in Metals
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This study shows the application of a system to monitor the state of damage of railway wheel steel specimens during rolling contact fatigue tests. This system can make continuous measurements with an evaluation of damage without stopping the tests and without destructive measurements. Four tests were carried out to train the system by recording torque and vibration data. Both statistical and spectral features were extracted from the sensors signals. A Principal Component Analysis (PCA) was performed to reduce the volume of the initial dataset; then, the data were classified with the k-means algorithm. The results were then converted into probabilities curves. Metallurgical investigations (optical micrographs, wear curves) and hardness tests were carried out to assess the trends of machine learning analysis. The training tests were used to train the proposed algorithm. Three validation tests were performed by using the real-time results of the k-means algorithm as a stop condition. Metallurgical analysis was performed also in this case. The validation tests follow the results of the training test and metallurgical analysis confirms the damage found with the machine learning analysis: when the membership probability of the cluster corresponding to the damage state reaches a value higher than 0.5, the metallurgical analysis clearly shows the cracks on the surface of the specimen due to the rolling contact fatigue (RCF) damage mechanism. These preliminary results are positive, even if reproduced on a limited set of specimens. This approach could be integrated in rolling contact fatigue tests to provide additional information on damage progression.

ACS Style

Luca Provezza; Ileana Bodini; Candida Petrogalli; Matteo Lancini; Luigi Solazzi; Michela Faccoli. Monitoring the Damage Evolution in Rolling Contact Fatigue Tests Using Machine Learning and Vibrations. Metals 2021, 11, 283 .

AMA Style

Luca Provezza, Ileana Bodini, Candida Petrogalli, Matteo Lancini, Luigi Solazzi, Michela Faccoli. Monitoring the Damage Evolution in Rolling Contact Fatigue Tests Using Machine Learning and Vibrations. Metals. 2021; 11 (2):283.

Chicago/Turabian Style

Luca Provezza; Ileana Bodini; Candida Petrogalli; Matteo Lancini; Luigi Solazzi; Michela Faccoli. 2021. "Monitoring the Damage Evolution in Rolling Contact Fatigue Tests Using Machine Learning and Vibrations." Metals 11, no. 2: 283.

Journal article
Published: 11 November 2020 in Composite Structures
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The focus of this research is to evaluate the variability of the stress state in hydraulic cylinder, due to the deviation respect to the nominal values for both the geometrical and the material properties. The element is composed by a multilayer in which the inner layer is made by means of a thin tubular aluminum part, while the coating is made of composite material. The analytical work developed is based on the theory of axial symmetric elements and finds its application in a real hydraulic cylinder made for heavy duty i.e. for an earth moving machine (internal pressure 350 bar). The research is also developed by considering and comparing the results obtained by designing a component made of a single aluminum layer. From the results, it is clear that the multilayer solution has a variability, much higher than the component made by a single layer. This result, therefore, requires at least a complete revision of the safety coefficient evaluated and imposed by standards.

ACS Style

Luigi Solazzi. Stress variability in multilayer composite hydraulic cylinder. Composite Structures 2020, 259, 113249 .

AMA Style

Luigi Solazzi. Stress variability in multilayer composite hydraulic cylinder. Composite Structures. 2020; 259 ():113249.

Chicago/Turabian Style

Luigi Solazzi. 2020. "Stress variability in multilayer composite hydraulic cylinder." Composite Structures 259, no. : 113249.

Journal article
Published: 25 July 2020 in Actuators
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This research was derived from the experimental observation that hydraulic actuators are positioned on machines that are subjected to movements and whose dynamic actions, the accelerations, are very high; it is acceptable to think of an actuator for an anthropomorphic robot. From this point of view, the weight of the actuator plays a fundamental role in the performance of the machine. In order to face this problem, a real hydraulic cylinder has been designed (for use on an earth moving machine) both analytically (adopting the theories of continuous mechanics) and numerically through finite element analysis. The results obtained were then generalized by determining functions that in relation to specific values of the variables, such as working pressure, allow one to determine the minimum weight of the component and its geometric configuration. The functions also made it possible to identify the most significant contributions to the overall weight of the component and therefore the elements on which to focus the subsequent lightening process. In particular, the greatest contribution is made by obtaining relations that are completely general and therefore adaptable to different case studies.

ACS Style

Luigi Solazzi; Andrea Buffoli; Raffaele Formicola. The Multi-Parametric Weight Optimization of a Hydraulic Actuator. Actuators 2020, 9, 60 .

AMA Style

Luigi Solazzi, Andrea Buffoli, Raffaele Formicola. The Multi-Parametric Weight Optimization of a Hydraulic Actuator. Actuators. 2020; 9 (3):60.

Chicago/Turabian Style

Luigi Solazzi; Andrea Buffoli; Raffaele Formicola. 2020. "The Multi-Parametric Weight Optimization of a Hydraulic Actuator." Actuators 9, no. 3: 60.

Journal article
Published: 01 January 2020 in FME Transactions
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Izučava se dinamičko ponašanje realne portalne dizalice izložene većem broju pokreta kolica i korisnog tereta. Razvijen je poseban numerički postupak koji je primenjen metodom konačnih elemenata na simulaciju različitih načina kretanja glavne grede. Rezultati jasno pokazuju da pomeraj krana, naročito longitudinalni, u velikoj meri zavisi od ubrzanja kako u početnoj tako i u fazi zaustavljanja, čemu su kolica izložena za vreme kretanja glavne grede krana. Poslednji deo rada prikazuje simulaciju iznenadnog zaustavljanja kretanja kolica i potonjeg ljuljanja korisnog tereta; u ovom slučaju, dužina užeta koje zaustavlja koristan teret na kolicima ima glavnu ulogu u određivanju kretanja i maksimalnog longitudinalnog pomeraja dizalice. dynamic load; load movement; dynamic behaviour; dynamic analyses; lifting equipment; crane; finite element analyses

ACS Style

Luigi Solazzi; Nenad Zrnić. Dynamic analyses of gantry crane under several trolley and payload movements. FME Transactions 2020, 48, 281 -286.

AMA Style

Luigi Solazzi, Nenad Zrnić. Dynamic analyses of gantry crane under several trolley and payload movements. FME Transactions. 2020; 48 (2):281-286.

Chicago/Turabian Style

Luigi Solazzi; Nenad Zrnić. 2020. "Dynamic analyses of gantry crane under several trolley and payload movements." FME Transactions 48, no. 2: 281-286.

Journal article
Published: 01 January 2020 in FME Transactions
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Rad se bavi numeričkim istraživanjem uticaja ponavljanog opterećenja na derik dizalicu. Istraživanjem su obuhvaćene dve različite geometrijske konfiguracije dizalice i dve različite dužine užeta. Posle preliminarne evaluacije statičkih i dinamičkih performansi dizalice izvršene su analize primenom različitih ciklusa opterećenja. Primenjeno je više impulsnih opterećenja tokom aktivnog korišćenja dizalice. Impulsno opterećenje odlikuju dva parametra: trajanje opterećenja i kašnjenje između njegova dva uzastopna delovanja. Stanje opterećenja, koje ne postoji u standardima za projektovanje dizalice, eksperimentalno je provereno instaliranjem dizalize za rad u kamenolomu. Rezultati pokazuju da se kod specifične konfiguracije dizalice, koju odlikuje položaj glavne strele, dužina užeta i ciklusi opterećenja, vibracije i magnituda pomeraja povećavaju u vremenu, što izaziva porast vrednosti napona kod komponenata dizalice, a što bi moglo da dovede do njenog rušenja. dynamic load; impulse load; structural vibration; moving load; derrick crane

ACS Style

Luigi Solazzi. Effect of recurrent impulse load actions on a crane. FME Transactions 2020, 48, 266 -271.

AMA Style

Luigi Solazzi. Effect of recurrent impulse load actions on a crane. FME Transactions. 2020; 48 (2):266-271.

Chicago/Turabian Style

Luigi Solazzi. 2020. "Effect of recurrent impulse load actions on a crane." FME Transactions 48, no. 2: 266-271.

Journal article
Published: 05 October 2019 in Composite Structures
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The goal of this research is to design, implement and then perform experimental analyses on a hydraulic actuator made of innovative materials such as composite material (carbon fibers and epoxy resin) and the aluminium alloy under high pressure. The cylinder tube is made of an aluminium alloy tubular element wrapped in a composite material; the piston rod is made of composite material and the ends, the attachments and the flanges are made of aluminium alloy. The sizing of the cylinder tube, being a multilayer component under internal pressure, was performed by developing a new theory. Then, a series of numerical finite element analyses were carried out. After the construction of the component, the next phase is experimental tests also made by applying numerous strain gauges to the actuator. The experimental results confirmed the results obtained through analytical and numerical methods. The hydraulic actuator is made up of a composite material and aluminium alloy. The hydraulic actuator made of composite material and aluminium alloy, has a weight of about 12% of the one in a classic structural steel and seems to be a very good result for a continuous lightening of the structural components of the machine.

ACS Style

Luigi Solazzi. Design and experimental tests on hydraulic actuator made of composite material. Composite Structures 2019, 232, 111544 .

AMA Style

Luigi Solazzi. Design and experimental tests on hydraulic actuator made of composite material. Composite Structures. 2019; 232 ():111544.

Chicago/Turabian Style

Luigi Solazzi. 2019. "Design and experimental tests on hydraulic actuator made of composite material." Composite Structures 232, no. : 111544.

Conference paper
Published: 25 July 2019 in Journal of Physics: Conference Series
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Overhead cranes are machines designed to lift and transport heavy equipment and materials. For this reason, their design is regulated by rigorous standards (for example, the series EN13000 in Europe). However, the standards do not take into account the effect of cyclic loading due to, for example, rapid successions of short commands to place heavy machines and structures in a required position. Therefore, the aim of this research is to study the structural effect of rapid successions of command impulses. The preliminary results show that the displacement of the structure over time increases when the command impulses have a frequency equal or close to the natural frequency of the structure.

ACS Style

L Solazzi; C Remino; G Incerti. Overhead crane subjected to impulse loading. Journal of Physics: Conference Series 2019, 1264, 012045 .

AMA Style

L Solazzi, C Remino, G Incerti. Overhead crane subjected to impulse loading. Journal of Physics: Conference Series. 2019; 1264 (1):012045.

Chicago/Turabian Style

L Solazzi; C Remino; G Incerti. 2019. "Overhead crane subjected to impulse loading." Journal of Physics: Conference Series 1264, no. 1: 012045.

Conference paper
Published: 25 July 2019 in Journal of Physics: Conference Series
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The present work concerns the oscillations and therefore the displacements present on a portal crane in the case in which the trolley is moved with different laws and in particular with different maximum accelerations. The work also investigates the effects of an abrupt stop of the trolley movement and also how the load oscillations, following the stop of the trolley movement, generates vibrations in the crane structure which are correlated to the crane natural frequencies. The work was developed on a real geometry of portal cranes using the finite element method. A new procedure was developed and implemented to simulate variable forces on the crane i.e. the forces induced by the trolley movement. The results show that in determinate conditions, the displacement and therefore the relative oscillations are very significant and therefore cannot be neglected.

ACS Style

L Solazzi; M Cima. Structural dynamics of big gantry crane subjected to different trolley move laws. Journal of Physics: Conference Series 2019, 1264, 012046 .

AMA Style

L Solazzi, M Cima. Structural dynamics of big gantry crane subjected to different trolley move laws. Journal of Physics: Conference Series. 2019; 1264 (1):012046.

Chicago/Turabian Style

L Solazzi; M Cima. 2019. "Structural dynamics of big gantry crane subjected to different trolley move laws." Journal of Physics: Conference Series 1264, no. 1: 012046.

Article
Published: 12 June 2019 in Applied Composite Materials
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The aim of this research is to design a telescopic hydraulic cylinder, normally used in industrial filed, made of different materials and in particular composite material instead of classical structural steel. Specifically it will refer to the application of this actuator on a dump truck and designated to the transport of soil material, starting from hard load conditions and from the minimum incline to guarantee the complete emptying of the dump truck, the geometry of the cylinder has been defined. The peculiarity of this research is about the materials employed for the design, and the future fulfilment of this component. The work deal with the custom of 4 different materials, or rather: 2 type of steel (structural: S235 JR and stainless AISI 304), aluminum alloy 7075-T6 (Ergal) and a composite material made of epoxy resin and carbon fibers. The elaboration of the new solutions presented, has been realized evaluating the barrel of the cylinder as a container in a pressure vessel with thin walled, whereas the rod as a beam prone to buckling. Is possible to observe how the study has been faced also with the aid of analysis about finite elements, as well as to verify the design of the component, also to prove others phenomena, as the instability for peak load. Moreover is possible to highlight that the adopted theory for the planning of composite barrel, despite load conditions are the same, they differs from the theory used for aluminum and steel because of his anisotropic behavior. Given the particular nature of the composite material, the arguments related with technology are set out, about technology production through filament winding and the assembly of the components of the telescopic cylinder. Thanks to the achieved results, is possible to observe how the use of the composite material, for the realization of that component, can be extremely favorable for the weight achieving a reduction of the 96% starting from 5537 N, reaching 196 N.

ACS Style

Luigi Solazzi; Andrea Buffoli. Telescopic Hydraulic Cylinder Made of Composite Material. Applied Composite Materials 2019, 26, 1189 -1206.

AMA Style

Luigi Solazzi, Andrea Buffoli. Telescopic Hydraulic Cylinder Made of Composite Material. Applied Composite Materials. 2019; 26 (4):1189-1206.

Chicago/Turabian Style

Luigi Solazzi; Andrea Buffoli. 2019. "Telescopic Hydraulic Cylinder Made of Composite Material." Applied Composite Materials 26, no. 4: 1189-1206.

Journal article
Published: 26 February 2019 in Composite Structures
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The aim of this work is to design the arms of a specific excavator adopting unconventional materials and comparing the machine performance due to components lightweight. A real excavator is numerically studied under specific load conditions; subsequently a series of experimental tests were performed in order to quantify the dynamic effects induced by moving load. On the basis of the actions determined by the load diagram and the inertia ones, a structural evaluation was performed on the arms in their original configuration. The results obtained were assumed like minimum performance for new design components using aluminum alloy and composite material with carbon fibers instead of structural steel. The geometry developed by adopting the composite material has an elliptical section instead of a classical rectangular section. With the adoption of the new solutions there is a total weight reduction up to 64.1% for the solution made of composite materials.

ACS Style

Luigi Solazzi; Ahmad Assi; Federico Ceresoli. Excavator arms: Numerical, experimental and new concept design. Composite Structures 2019, 217, 60 -74.

AMA Style

Luigi Solazzi, Ahmad Assi, Federico Ceresoli. Excavator arms: Numerical, experimental and new concept design. Composite Structures. 2019; 217 ():60-74.

Chicago/Turabian Style

Luigi Solazzi; Ahmad Assi; Federico Ceresoli. 2019. "Excavator arms: Numerical, experimental and new concept design." Composite Structures 217, no. : 60-74.

Journal article
Published: 12 February 2019 in Metals
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Weight reduction and material substitution are increasing trends in the automotive industry. High pressure die casting (HPDC) is the conventional casting technology for the high volume production of light alloys; it has recently found wide application in the manufacturing of critical components, such as complex and thin geometry automotive parts. However, the major restriction of this affordable technology is the difficulty to design and realize hollow sections or components with undercuts. An innovative way to further increase the competitiveness of HPDC is to form complex undercut shaped parts through the use of new lost cores that are able endure the high pressures used in HPDC. This paper investigates the use of innovative ceramic lost cores in the production of a passenger car aluminum crossbeam by HPDC. Firstly, process and structural simulations were performed to improve the crossbeam design and check the technology features. The results led to the selection of the process parameters and the production of some prototypes that were finally characterized. These analyses demonstrate the feasibility of the production of hollow components by HPDC using ceramic cores.

ACS Style

Giovanna Cornacchia; Daniele Dioni; Michela Faccoli; Claudio Gislon; Luigi Solazzi; Andrea Panvini; Silvia Cecchel. Experimental and Numerical Study of an Automotive Component Produced with Innovative Ceramic Core in High Pressure Die Casting (HPDC). Metals 2019, 9, 217 .

AMA Style

Giovanna Cornacchia, Daniele Dioni, Michela Faccoli, Claudio Gislon, Luigi Solazzi, Andrea Panvini, Silvia Cecchel. Experimental and Numerical Study of an Automotive Component Produced with Innovative Ceramic Core in High Pressure Die Casting (HPDC). Metals. 2019; 9 (2):217.

Chicago/Turabian Style

Giovanna Cornacchia; Daniele Dioni; Michela Faccoli; Claudio Gislon; Luigi Solazzi; Andrea Panvini; Silvia Cecchel. 2019. "Experimental and Numerical Study of an Automotive Component Produced with Innovative Ceramic Core in High Pressure Die Casting (HPDC)." Metals 9, no. 2: 217.

Journal article
Published: 09 November 2018 in Composite Structures
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The present research concerns the feasibility study of a hydraulic cylinder for high pressures made of composite material and aluminium alloy. The study concerns the design of a hydraulic cylinder, for applications on a big excavator (pressure = 300 bar), adopting structural steel, aluminium alloy and finally composite material (carbon fibres and epoxy resin). The design methods adopted are both analytical and numerical. The construction technique hypothesized to make the composite component (cylinder tube) is filament winding. To avoid the damage caused by the sliding of the piston seals on the inside diameter of the cylinder tube, an aluminium tube is provided on which the composite material is wound. A series of experimental tests were carried out on a scale prototype. The results show that the solution created by the composite material and the aluminium alloy has a significantly lower weight compared to the steel solution; the value is about 10.5%.

ACS Style

Luigi Solazzi. Feasibility study of hydraulic cylinder subject to high pressure made of aluminum alloy and composite material. Composite Structures 2018, 209, 739 -746.

AMA Style

Luigi Solazzi. Feasibility study of hydraulic cylinder subject to high pressure made of aluminum alloy and composite material. Composite Structures. 2018; 209 ():739-746.

Chicago/Turabian Style

Luigi Solazzi. 2018. "Feasibility study of hydraulic cylinder subject to high pressure made of aluminum alloy and composite material." Composite Structures 209, no. : 739-746.

Journal article
Published: 01 September 2018 in Case Studies in Thermal Engineering
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ACS Style

Antonio Giuffrida; Gianluca Valenti; Davide Palamini; Luigi Solazzi. On the conceptual design of the novel balanced rolling piston expander. Case Studies in Thermal Engineering 2018, 12, 38 -46.

AMA Style

Antonio Giuffrida, Gianluca Valenti, Davide Palamini, Luigi Solazzi. On the conceptual design of the novel balanced rolling piston expander. Case Studies in Thermal Engineering. 2018; 12 ():38-46.

Chicago/Turabian Style

Antonio Giuffrida; Gianluca Valenti; Davide Palamini; Luigi Solazzi. 2018. "On the conceptual design of the novel balanced rolling piston expander." Case Studies in Thermal Engineering 12, no. : 38-46.

Conference paper
Published: 03 August 2018 in EPJ Web of Conferences
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The interaction of very low energy antiprotons (ps) and antineutrons (ns) with nuclei is interesting for its influence on both fundamental cosmology and nuclear physics. Measuring the annihilation cross section of antimatter on matter can help in solving the universe matter-antimatter puzzle and could give relevant hints in the definition of strong interaction model parameters as well. The ASACUSA collaboration recently measured the antiproton-carbon annihilation cross section at 5.3 MeV of kinetic energy of the incoming antiproton. The experimental apparatus consisted in a vacuum chamber containing thin foils (~0.7-1 μm) of carbon crossed by a bunched beam of antiprotons from the CERN Antiproton Decelerator (AD). The fraction of antiprotons annihilating on the target nucleons gives origin to charged pions which can be detected and counted by segmented scintillators placed outside the chamber. This work describes the experimental details of the apparatus and the technique to perform the cross section measurements.

ACS Style

H. Aghai-Khozani; M. Corradini; R. Hayano; M. Hori; M. Leali; E. Lodi-Rizzini; V. Mascagna; Y. Murakami; M. Prest; L. Solazzi; E. Vallazza; L. Venturelli; H. Yamada. Experimental technique for antiproton-nucleus annihilation cross section measurements at low energy. EPJ Web of Conferences 2018, 182, 03009 .

AMA Style

H. Aghai-Khozani, M. Corradini, R. Hayano, M. Hori, M. Leali, E. Lodi-Rizzini, V. Mascagna, Y. Murakami, M. Prest, L. Solazzi, E. Vallazza, L. Venturelli, H. Yamada. Experimental technique for antiproton-nucleus annihilation cross section measurements at low energy. EPJ Web of Conferences. 2018; 182 ():03009.

Chicago/Turabian Style

H. Aghai-Khozani; M. Corradini; R. Hayano; M. Hori; M. Leali; E. Lodi-Rizzini; V. Mascagna; Y. Murakami; M. Prest; L. Solazzi; E. Vallazza; L. Venturelli; H. Yamada. 2018. "Experimental technique for antiproton-nucleus annihilation cross section measurements at low energy." EPJ Web of Conferences 182, no. : 03009.

Conference paper
Published: 01 August 2018 in Journal of Physics: Conference Series
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A machine learning technique was used to monitor the state of damage of steel specimens subjected to cyclic contact fatigue tests and to make a continuous measurement without coming into contact with the specimens examined. Six different sets of specimens were considered and the torque and vibration data obtained from their respective tests were analyzed. Different statistical and spectral characteristics were obtained from each dataset, to represent their information content. The correlation existing between the characteristics was studied to select only the essential ones. The global data volume was reduced by a principal component analysis. The data thus obtained were subsequently processed, and classified, developing a K-means algorithm. The results were formulated in probabilistic terms with the aid of membership charts, confusion matrices and probability curves. The results obtained from this first analysis are highly encouraging. The algorithm is able to assess the damage status of the specimens, as well as detect the operating conditions of the machine. A substantial advantage of this method is the ability to estimate quantitatively the damage by calculating the distance of the current data from specific references. The performances of this approach were numerically estimated in terms of sensitivity, specificity and accuracy.

ACS Style

M. Bini Chiesa; I. Bodini; C. Petrogalli; L. Provezza; M. Faccoli; A. Mazzù; L. Solazzi; G. Sansoni; M. Lancini. K-means clustering approach for damage evolution monitoring in RCF tests. Journal of Physics: Conference Series 2018, 1065, 102018 .

AMA Style

M. Bini Chiesa, I. Bodini, C. Petrogalli, L. Provezza, M. Faccoli, A. Mazzù, L. Solazzi, G. Sansoni, M. Lancini. K-means clustering approach for damage evolution monitoring in RCF tests. Journal of Physics: Conference Series. 2018; 1065 (10):102018.

Chicago/Turabian Style

M. Bini Chiesa; I. Bodini; C. Petrogalli; L. Provezza; M. Faccoli; A. Mazzù; L. Solazzi; G. Sansoni; M. Lancini. 2018. "K-means clustering approach for damage evolution monitoring in RCF tests." Journal of Physics: Conference Series 1065, no. 10: 102018.

Journal article
Published: 01 January 2018 in FME Transactions
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ACS Style

Luigi Solazzi. Stochastic wind loading applied to container crane. FME Transactions 2018, 46, 299 -305.

AMA Style

Luigi Solazzi. Stochastic wind loading applied to container crane. FME Transactions. 2018; 46 (3):299-305.

Chicago/Turabian Style

Luigi Solazzi. 2018. "Stochastic wind loading applied to container crane." FME Transactions 46, no. 3: 299-305.

Journal article
Published: 30 December 2017 in International Journal of Automotive and Mechanical Engineering
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ACS Style

Massimo Collotta; Luigi Solazzi. New design concept of a tank made of plastic material for firefighting vehicle. International Journal of Automotive and Mechanical Engineering 2017, 14, 4603 -4615.

AMA Style

Massimo Collotta, Luigi Solazzi. New design concept of a tank made of plastic material for firefighting vehicle. International Journal of Automotive and Mechanical Engineering. 2017; 14 (4):4603-4615.

Chicago/Turabian Style

Massimo Collotta; Luigi Solazzi. 2017. "New design concept of a tank made of plastic material for firefighting vehicle." International Journal of Automotive and Mechanical Engineering 14, no. 4: 4603-4615.

Article
Published: 27 September 2017 in Experimental Techniques
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This paper presents an experimental investigation on a middle tension (MT) specimen made of a low carbon structural steel subjected to cyclic loading. The work was aimed to assess the effectiveness of Barkhausen Noise method in detecting the crack closure phenomenon. The Influence of probe orientation and position ahead the crack tip was examined, in order to optimize the magnetic measurements. A filtering procedure was also used to treat the Barkhausen Noise signal. A procedure was proposed to determine the crack-opening load from it. On the same specimen, some strain gauge measurements were carried out to determine the crack-opening load by the local compliance method. The results showed a good agreement of the results obtained with the two experimental techniques.

ACS Style

G. Donzella; L. Solazzi; C. Petrogalli. Experimental Investigation on the Crack Closure Phenomenon Using Barkhausen Noise Method. Experimental Techniques 2017, 41, 605 -613.

AMA Style

G. Donzella, L. Solazzi, C. Petrogalli. Experimental Investigation on the Crack Closure Phenomenon Using Barkhausen Noise Method. Experimental Techniques. 2017; 41 (6):605-613.

Chicago/Turabian Style

G. Donzella; L. Solazzi; C. Petrogalli. 2017. "Experimental Investigation on the Crack Closure Phenomenon Using Barkhausen Noise Method." Experimental Techniques 41, no. 6: 605-613.

Article
Published: 05 September 2017 in Applied Composite Materials
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The purpose of the present paper is to lightweight design an excavator arms, by using a different materials and in particular composite material. Specifically, the research is based on the study of a commercial excavator, by determining its geometry and analyzing the load conditions to which it is exposed. These are determined in relation to either the load diagram of the machine or the possible utilities of the excavator, such as the rotation of the machine. The materials used and implemented in the different analytical and numerical elaborations are classic construction steel S 355 (UNI EN 10025–3), high-resistance steel S 890 (UNI EN 10025–6), aluminum Al 6063 T6 (UNI EN 573–3) and the composite material made by carbon fiber and epoxy resin. The adopted constraints for the design of new arms with different materials, non-conventional for these applications, are numerous. The new solutions must present a safety factor either with respect to the yield tensile strength or to the critical load of buckling greater than or equal to the one determined for the excavator in its original geometrical conformation. Another criterion, which has heavily conditioned the geometry of the arms, was given by the fact that the developed solutions must present a very similar value of the maximum displacement in the different load conditions analyzed. A new geometry for arms made by composite material was developed. It was an elliptical conic section, instead of the classic rectangular section, in order to use the filament winding technological process. As for the adoption of the composite material, we focused on the study and the design of this material as long as the interaction with the extremities (made of aluminum) which are interfaced either with the link between the arms or with the elements of the hydraulic plant which serves for the arms movement. From the results developed, it emerges that the solution developed by adopting composite materials is the one that permits the maximum weight reduction for all arms, about 68.1%, which can be seen as an increment of the maximum mass transportable about 45.5% i.e. passing from 5000 kg to 7277 kg.

ACS Style

Luigi Solazzi; Ahmad Assi; F. Ceresoli. New Design Concept for an Excavator Arms by Using Composite Material. Applied Composite Materials 2017, 25, 601 -617.

AMA Style

Luigi Solazzi, Ahmad Assi, F. Ceresoli. New Design Concept for an Excavator Arms by Using Composite Material. Applied Composite Materials. 2017; 25 (3):601-617.

Chicago/Turabian Style

Luigi Solazzi; Ahmad Assi; F. Ceresoli. 2017. "New Design Concept for an Excavator Arms by Using Composite Material." Applied Composite Materials 25, no. 3: 601-617.

Journal article
Published: 06 March 2017 in Materials
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This study is a detailed failure analysis of galvanized high carbon steel wires, which developed coating cracks during the torsion test performed as a quality control at the end of the manufacturing process. Careful visual inspections showed that the cracks are already present in the coating before the torsion test. In order to explain the origin of these cracks, systematic metallographic investigations were performed by means of optical and scanning electron microscope on both the wires and the rods that have been cold drawn to produce the wire. The chemical composition of the galvanized coatings was evaluated by means of energy dispersive spectroscopy. Micro bidimensional X-ray diffraction experiments were also performed to measure the residual stresses in the galvanized coating. The results showed that the failure is related to two main factors: the relatively high content of silicon in the steel and the unsuitable cooling rate of the rods at the exit from the galvanizing bath. The mechanism proposed to explain the origin of the defects was supported by Finite Elements Methods simulations and verified with in-plant tests. The proper countermeasures were then applied and the problem successfully solved.

ACS Style

Marcello Gelfi; Luigi Solazzi; Sandro Poli. Influence of the Manufacturing Process on Defects in the Galvanized Coating of High Carbon Steel Wires. Materials 2017, 10, 264 .

AMA Style

Marcello Gelfi, Luigi Solazzi, Sandro Poli. Influence of the Manufacturing Process on Defects in the Galvanized Coating of High Carbon Steel Wires. Materials. 2017; 10 (3):264.

Chicago/Turabian Style

Marcello Gelfi; Luigi Solazzi; Sandro Poli. 2017. "Influence of the Manufacturing Process on Defects in the Galvanized Coating of High Carbon Steel Wires." Materials 10, no. 3: 264.