This page has only limited features, please log in for full access.

Prof. JERZY SMARDZEWSKI
Faculty of Wood Technology, Uniwersytet Przyrodniczy w Poznaniu, Poznań, Poland

Basic Info


Research Keywords & Expertise

0 CAD
0 CAE
0 FEM
0 Joints
0 Metamaterials

Fingerprints

Wood
Joints
sandwich panels
FEM
wood-based composites
Metamaterials
Auxetic structures

Honors and Awards

The user has no records in this section


Career Timeline

The user has no records in this section.


Short Biography

The user biography is not available.
Following
Followers
Co Authors
The list of users this user is following is empty.
Following: 0 users

Feed

Journal article
Published: 01 June 2021 in Materials
Reads 0
Downloads 0

The elastic properties of f.c.c. hard sphere crystals with periodic arrays of nanoinclusions filled by hard spheres of another diameter are the subject of this paper. It has been shown that a simple modification of the model structure is sufficient to cause very significant changes in its elastic properties. The use of inclusions in the form of joined (mutually orthogonal) layers and channels showed that the resulting tetragonal system exhibited a complete lack of auxetic properties when the inclusion spheres reached sufficiently large diameter. Moreover, it was very surprising that this hybrid inclusion, which can completely eliminate auxeticity, was composed of components that, alone, in these conditions, enhanced the auxeticity either slightly (layer) or strongly (channel). The study was performed with computer simulations using the Monte Carlo method in the isothermal-isobaric (NpT) ensemble with a variable box shape.

ACS Style

Jakub Narojczyk; Krzysztof Wojciechowski; Jerzy Smardzewski; Attila Imre; Joseph Grima; Mikołaj Bilski. Cancellation of Auxetic Properties in F.C.C. Hard Sphere Crystals by Hybrid Layer-Channel Nanoinclusions Filled by Hard Spheres of Another Diameter. Materials 2021, 14, 3008 .

AMA Style

Jakub Narojczyk, Krzysztof Wojciechowski, Jerzy Smardzewski, Attila Imre, Joseph Grima, Mikołaj Bilski. Cancellation of Auxetic Properties in F.C.C. Hard Sphere Crystals by Hybrid Layer-Channel Nanoinclusions Filled by Hard Spheres of Another Diameter. Materials. 2021; 14 (11):3008.

Chicago/Turabian Style

Jakub Narojczyk; Krzysztof Wojciechowski; Jerzy Smardzewski; Attila Imre; Joseph Grima; Mikołaj Bilski. 2021. "Cancellation of Auxetic Properties in F.C.C. Hard Sphere Crystals by Hybrid Layer-Channel Nanoinclusions Filled by Hard Spheres of Another Diameter." Materials 14, no. 11: 3008.

Original article
Published: 11 March 2021 in European Journal of Wood and Wood Products
Reads 0
Downloads 0

The research determined the resistance to compression and low velocity impact of wood-based sandwich panels, the face sheet made of high-density fiber board, and high pressure laminate, while its auxetic lattice core was made by 3D printing using LayWood bio-composite filament. The core's auxetic property (i.e. exhibiting negative Poisson's ratio) was observed within the planes parallel to the facings. The ability of particular types of multilayer panels to absorb the energy was also determined. Based on the analysis of the obtained test results, it was proven that the core denoted as B, with inclination angle of the cell ribs $${{\varphi }_{x}=\varphi }_{y}=65^\circ$$ φ x = φ y = 65 ∘ , shows the highest compressive strength. It was determined that the dynamic load causes a very high overload in high-density fiber board face sheets. This results in damage to the sandwich panel surface and core structure. Cells of type B favorably minimize the differences in absorbed energy when using different face sheets and the energy value for low velocity impact. Taking into account the amount of absorbed energy, the most attractive is the panel with the D-type orthotropic core characterized by an inclination angle of the cell ribs $${\varphi }_{x}= 30^\circ , {\varphi }_{y}=60^\circ$$ φ x = 30 ∘ , φ y = 60 ∘ . The amount of energy absorbed by samples with high-density fiberboard face sheets increases significantly depending on the impactor's energy. For panels with face sheets manufactured from high-pressure laminate, the amount of energy absorbed decreases.

ACS Style

Jerzy Smardzewski; Michał Maslej; Krzysztof W. Wojciechowski. Compression and low velocity impact response of wood-based sandwich panels with auxetic lattice core. European Journal of Wood and Wood Products 2021, 79, 797 -810.

AMA Style

Jerzy Smardzewski, Michał Maslej, Krzysztof W. Wojciechowski. Compression and low velocity impact response of wood-based sandwich panels with auxetic lattice core. European Journal of Wood and Wood Products. 2021; 79 (4):797-810.

Chicago/Turabian Style

Jerzy Smardzewski; Michał Maslej; Krzysztof W. Wojciechowski. 2021. "Compression and low velocity impact response of wood-based sandwich panels with auxetic lattice core." European Journal of Wood and Wood Products 79, no. 4: 797-810.

Journal article
Published: 10 October 2020 in Engineering Structures
Reads 0
Downloads 0

Limited number of papers describe the practical use of auxetics in the wood and furniture sector. Only one paper describes the auxetic nails. None of them analyzed the impact of using auxetics on the strength of furniture joints. The aim of this investigation was to design and manufacture different kinds of auxetic dowels with corresponding muffs and experimentally, theoretically, and numerically analyze the minimum mounting forces, contact pressures, and friction coefficients of these dowels in particleboard. Firstly, auxetic properties of the dowels were numerically determined, and then obtained values were confirmed by real compression tests in order to be sure that the dowels had negative Poisson’s ratios. All dowels were manufactured from polyamide (PA12) with 3D printing Selective Laser Sintering (SLS) technology. Static compression tests were carried out for obtaining the minimum mounting force needed to insert the dowel into the muff. Numerical analyses were performed by means of Abaqus/Explicit v6.14-2 software. Contact pressures and friction coefficients were also theoretically calculated and compared to the results of numerical analyses and real tests. At the end of the tests, the auxetic dowels gave lower mounting force values than the non-auxetic dowels. Mounting force values of dowels decreased as the dowel hole diameter and size of inclusions are increased. Furthermore, the contact pressures on the surface of the auxetic dowels were considerably lower than in the non-auxetic dowels. In conclusion, it could be said that the auxetic dowels could be utilized as an alternative fastener for the traditional furniture dowels. Therefore, withdrawal strength and corner joint tests of the auxetic dowels should be investigated in future studies.

ACS Style

Tolga Kuşkun; Jerzy Smardzewski; Ali Kasal. Experimental and numerical analysis of mounting force of auxetic dowels for furniture joints. Engineering Structures 2020, 226, 111351 .

AMA Style

Tolga Kuşkun, Jerzy Smardzewski, Ali Kasal. Experimental and numerical analysis of mounting force of auxetic dowels for furniture joints. Engineering Structures. 2020; 226 ():111351.

Chicago/Turabian Style

Tolga Kuşkun; Jerzy Smardzewski; Ali Kasal. 2020. "Experimental and numerical analysis of mounting force of auxetic dowels for furniture joints." Engineering Structures 226, no. : 111351.

Journal article
Published: 24 September 2020 in Materials
Reads 0
Downloads 0

Studies on the application of the auxetic metamaterials and structures in furniture joints are very limited. However, they have huge potential for use in ready-to-assemble furniture. This study aimed to design and produce different types of auxetic dowels in 3D printing technology, and experimentally and numerically analyze the withdrawal strength of these dowels. In the scope of the study, 24 auxetic dowels with different types and size of inclusions, a different diameter of holes, and a non-auxetic reference dowel were designed and produced with appropriate muffs. Dowels were 3D printed from polyamide (PA12). Poisson’s ratios, withdrawal strength, contact pressures, and friction coefficients of dowels were determined theoretically by means of numerical analyses and real static compression tests. After the pre-production of dowels, the dowels with triangular inclusions have not been found to have sufficient strength and stiffness. Withdrawal strength of dowels decreased as the size of inclusions is decreased, or dowel hole diameter is increased. Furthermore, contact pressures and stresses in auxetic dowels were considerably lower than non-auxetic dowels under the withdrawal force.

ACS Style

Ali Kasal; Tolga Kuşkun; Jerzy Smardzewski. Experimental and Numerical Study on Withdrawal Strength of Different Types of Auxetic Dowels for Furniture Joints. Materials 2020, 13, 4252 .

AMA Style

Ali Kasal, Tolga Kuşkun, Jerzy Smardzewski. Experimental and Numerical Study on Withdrawal Strength of Different Types of Auxetic Dowels for Furniture Joints. Materials. 2020; 13 (19):4252.

Chicago/Turabian Style

Ali Kasal; Tolga Kuşkun; Jerzy Smardzewski. 2020. "Experimental and Numerical Study on Withdrawal Strength of Different Types of Auxetic Dowels for Furniture Joints." Materials 13, no. 19: 4252.

Journal article
Published: 23 September 2020 in Composite Structures
Reads 0
Downloads 0

An important factor affecting the quality of furniture joints is the value of mounting forces. Most of the research to date described in the literature focuses mainly on the reaction of furniture joints to the static loads. However, there is a lack of knowledge about the properties of these joints under dynamic loading conditions. This study aimed to verify the research hypothesis that mounting forces in L-type furniture corner joints have a significant effect on the amount of energy absorbed during low speed impact. The reasons for the damaged joints and the effect of the material type and load schemes used were explained. Newly designed, innovative furniture fasteners and traditional eccentric fittings were examined. Fasteners were mounted in particleboards and medium density fiberboards. The corner joints were subjected to dynamic tension and compression loads. Appropriate numerical models were developed to simulate the response of joints to dynamic loads. As a result, it was demonstrated that the ability of connections to absorb energy significantly depends on the value of the mounting forces and the type of materials used. Furthermore, a positive correlation between the mounting forces and the stiffness and strength of these joints was confirmed.

ACS Style

Łukasz Krzyżaniak; Jerzy Smardzewski. Impact damage response of L-type corner joints connected with new innovative furniture fasteners in wood-based composites panels. Composite Structures 2020, 255, 113008 .

AMA Style

Łukasz Krzyżaniak, Jerzy Smardzewski. Impact damage response of L-type corner joints connected with new innovative furniture fasteners in wood-based composites panels. Composite Structures. 2020; 255 ():113008.

Chicago/Turabian Style

Łukasz Krzyżaniak; Jerzy Smardzewski. 2020. "Impact damage response of L-type corner joints connected with new innovative furniture fasteners in wood-based composites panels." Composite Structures 255, no. : 113008.

Journal article
Published: 22 September 2020 in Materials
Reads 0
Downloads 0

The development of both light and strong wood-derived materials is an interesting research area, particularly in terms of usability in, e.g., furniture constructions. Honeycomb panels being current industry standard are relatively thick (32 mm and 40 mm), thus their attractiveness in designing furniture is limited. In a few studies, it has been shown that honeycomb panels with paper cores are characterized by unsatisfactory mechanical properties, especially when the composite thickness is less than 20 mm. From the literature, it is also evident that mechanical properties might be improved by introducing auxetic features into the core structure. Even though it is a concept with great potential, there are a few studies dealing with honeycomb panels with auxetic cores made of paper. Furthermore, there is no research on the corner joints made from such material. For this reason, the aim of the study was to test the bending behavior of the corner adhesive joints made of honeycomb panels with double arrow-shaped auxetic cores. Within the research, the core cell was adopted based on literature and preliminary studies, paper auxetic cores were produced by the use of the designed and 3d printed device, and joints stiffness and strength were calculated analytically based on the experiment results. Evaluated corner joints stiffness, both in compression and tension test, is greater for samples made of panels with designed auxetic cores. Surprisingly, in the analyzed range of elasticity, it was statistically proved that the values of joint stiffness coefficient K did not vary significantly between compared joints pairs.

ACS Style

Adam Majewski; Tomasz Krystofiak; Jerzy Smardzewski. Mechanical Properties of Corner Joints Made of Honeycomb Panels with Double Arrow-Shaped Auxetic Cores. Materials 2020, 13, 4212 .

AMA Style

Adam Majewski, Tomasz Krystofiak, Jerzy Smardzewski. Mechanical Properties of Corner Joints Made of Honeycomb Panels with Double Arrow-Shaped Auxetic Cores. Materials. 2020; 13 (18):4212.

Chicago/Turabian Style

Adam Majewski; Tomasz Krystofiak; Jerzy Smardzewski. 2020. "Mechanical Properties of Corner Joints Made of Honeycomb Panels with Double Arrow-Shaped Auxetic Cores." Materials 13, no. 18: 4212.

Journal article
Published: 31 July 2020 in Polymers
Reads 0
Downloads 0

The work concerns a three-point bending test of beams made of plywood, high density fibre boards, cardboard, and wood-epoxy mass. The goal of the investigation was to determine the effect of thickness and type of wood-based facings on stiffness, strength, ability to absorb, and dissipate the energy of sandwich beams with an auxetic core. The cognitive goal of the work was to demonstrate the possibility of using recycled materials for facings and cores instead of popular wood composites. Experimental studies and numerical calculations were performed on correctly calibrated models. Experimental studies have shown that the beams with HDF facings ( = 1528 MPa, = 12.61 MPa) and plywood facings ( = 1248–1395 MPa, = 8.34–10.40 MPa) have the most favourable mechanical properties. Beams with plywood facings also have a good ability to absorb energy (1.380–1.746 J), but, in this respect, the beams manufactured of HDF (2.223 J) exhibited better capacity. The use of an auxetic core and facings of plywood and cardboard significantly reduces the amount of dissipated energy (0.0093 J, 0.0067 J). Therefore, this type of structures can be used for modeling beams carrying high deflections.

ACS Style

Krzysztof Peliński; Jerzy Smardzewski. Bending Behavior of Lightweight Wood-Based Sandwich Beams with Auxetic Cellular Core. Polymers 2020, 12, 1723 .

AMA Style

Krzysztof Peliński, Jerzy Smardzewski. Bending Behavior of Lightweight Wood-Based Sandwich Beams with Auxetic Cellular Core. Polymers. 2020; 12 (8):1723.

Chicago/Turabian Style

Krzysztof Peliński; Jerzy Smardzewski. 2020. "Bending Behavior of Lightweight Wood-Based Sandwich Beams with Auxetic Cellular Core." Polymers 12, no. 8: 1723.

Journal article
Published: 07 May 2020 in Sustainability
Reads 0
Downloads 0

The paper concerns the importance of the trend of mass customization in building the competitive advantage of companies in the door joinery sector in Poland. Its purpose is an attempt at assessing the effects of mass customization carried out on a newly designed TechnoPORTA technological line for automated door production on the basis of an analysis of selected technical and economic indexes related to manufacturing costs. The basis for the calculation of these indexes was the value of material and labor costs and the projected production value in relation to eleven selected types of industrial doors. Based on the analysis of technical and economic indexes, it can be concluded that the introduction of the concept of mass customization will reduce gross costs of manufactured products which, with the assumed level of sales, will translate into annual profit. The results obtained allow for optimistic conclusions about the possibility of building the long-term competitive advantage of door manufacturers.

ACS Style

Marta Pędzik; Joanna Bednarz; Zdzisław Kwidziński; Tomasz Rogoziński; Jerzy Smardzewski. The Idea of Mass Customization in the Door Industry Using the Example of the Company Porta KMI Poland. Sustainability 2020, 12, 3788 .

AMA Style

Marta Pędzik, Joanna Bednarz, Zdzisław Kwidziński, Tomasz Rogoziński, Jerzy Smardzewski. The Idea of Mass Customization in the Door Industry Using the Example of the Company Porta KMI Poland. Sustainability. 2020; 12 (9):3788.

Chicago/Turabian Style

Marta Pędzik; Joanna Bednarz; Zdzisław Kwidziński; Tomasz Rogoziński; Jerzy Smardzewski. 2020. "The Idea of Mass Customization in the Door Industry Using the Example of the Company Porta KMI Poland." Sustainability 12, no. 9: 3788.

Journal article
Published: 29 April 2020 in Materials
Reads 0
Downloads 0

The research hypothesis states that the impregnation of the honeycomb paper core of lightweight sandwich panels with modified starch, sodium silicate and epoxy resin (LiquidWood®) resin has a significant effect on its elastic properties. In this study, a recycled paper was used in three thicknesses, seven types of cell shapes, including two after numerical optimization and three types of impregnating agents. The method of digital image analysis determined the elastic constants of manufactured paper cores, which were subjected to axial compression in two directions. Based on the experimental results, elastic constants of the cores were calculated and compared with the results of numerical calculations. It has been shown that each of the impregnating solutions used improved the stiffness of the paper core. The best results were obtained for LiquidWood® epoxy resin and modified starch. An important parameter of cell geometry affecting their rigidity is the angle of the cell wall φ, as well as the arrangement of the common cell wall in relation to the direction of load. The numerical models developed were positively verified.

ACS Style

Michał Słonina; Dorota Dziurka; Jerzy Smardzewski. Experimental Research and Numerical Analysis of the Elastic Properties of Paper Cell Cores before and after Impregnation. Materials 2020, 13, 2058 .

AMA Style

Michał Słonina, Dorota Dziurka, Jerzy Smardzewski. Experimental Research and Numerical Analysis of the Elastic Properties of Paper Cell Cores before and after Impregnation. Materials. 2020; 13 (9):2058.

Chicago/Turabian Style

Michał Słonina; Dorota Dziurka; Jerzy Smardzewski. 2020. "Experimental Research and Numerical Analysis of the Elastic Properties of Paper Cell Cores before and after Impregnation." Materials 13, no. 9: 2058.

Preprint
Published: 12 April 2020
Reads 0
Downloads 0

The research hypothesis states that the impregnation of the honeycomb paper core of lightweight sandwich panels with modified starch, sodium silicate and LiquidWood® resin has a significant effect on the elastic properties of it. In the study, a recycled paper was used in three thicknesses, seven types of cell shapes, including two after numerical optimization and three types of impregnating agents. The method of digital image analysis determined the elastic constants of manufactured paper cores, which were subjected to axial compression in two directions. Based on the experimental results, elastic constants of the cores were calculated and compared with the results of numerical calculations. It has been shown that each of the impregnating solutions used improves the stiffness of the paper core. The best results were obtained for LiquidWood® epoxy resin and modified starch. An important parameter of cell geometry affecting their rigidity is the angle of the cell wall φ, as well as the arrangement of the common cell wall in relation to the direction of load. The numerical models developed were positively verified.

ACS Style

Michał Słonina; Dorota Dziurka; Jerzy Smardzewski. Experimental Research and Numerical Analysis of the Elastic Properties of Paper Cell Cores Before and After Impregnation. 2020, 1 .

AMA Style

Michał Słonina, Dorota Dziurka, Jerzy Smardzewski. Experimental Research and Numerical Analysis of the Elastic Properties of Paper Cell Cores Before and After Impregnation. . 2020; ():1.

Chicago/Turabian Style

Michał Słonina; Dorota Dziurka; Jerzy Smardzewski. 2020. "Experimental Research and Numerical Analysis of the Elastic Properties of Paper Cell Cores Before and After Impregnation." , no. : 1.

Original paper
Published: 26 March 2020 in physica status solidi (b)
Reads 0
Downloads 0

Auxeticity of materials improves several of their mechanical properties, especially shear, impact and bending resistance. It also improves ability of materials to absorb impact energy as well as the overall stiffness of structures. In this research authors examined synclastic panels made from novel wood‐based composites. The aim was to determine the force‐displacement characteristics during uniaxial compression and obtain the stiffness of the panels. These data allow one to predict the behaviour of a panel during two‐axial bending with different support scenarios. FEM analysis was performed, with the use of model material, to determine the impact of varied facings thickness as well as different types of materials and core structures, on the stiffness of synclastic panels. It has been demonstrated that proposed multilayer composites allow forming (technologically difficult) spherical shapes, without additional heat and pressure treatment. The type of an outer layer material strictly determines the usability and ease of two‐axial bending process. Presented composites are interesting materials, that could have been adopted into the wood industry as a replacement for traditional materials e.g. bent plywood. This article is protected by copyright. All rights reserved.

ACS Style

Krzysztof Peliński; Jerzy Smardzewski; Jakub Narojczyk. Stiffness of Synclastic Wood‐Based Auxetic Sandwich Panels. physica status solidi (b) 2020, 257, 1 .

AMA Style

Krzysztof Peliński, Jerzy Smardzewski, Jakub Narojczyk. Stiffness of Synclastic Wood‐Based Auxetic Sandwich Panels. physica status solidi (b). 2020; 257 (10):1.

Chicago/Turabian Style

Krzysztof Peliński; Jerzy Smardzewski; Jakub Narojczyk. 2020. "Stiffness of Synclastic Wood‐Based Auxetic Sandwich Panels." physica status solidi (b) 257, no. 10: 1.

Journal article
Published: 05 October 2019 in Composite Structures
Reads 0
Downloads 0

Sandwich panels manufactured from wood and wood-based materials promote optimal management of natural resources, as they are obtained from renewable materials. For this reason numerous attempts are being made to use wood in the manufacture of light-weight layer composites exhibiting high rigidity and relatively low density. The aim of the study was to determine the energy absorption capacity in wooden sandwich panels with a prismatic core. This paper describes a method to manufacture a novel wood-based material with a prismatic core. Uniaxial compression tests and 3-point bending performed on the panels were discussed together with the method to determine the amounts of absorbed energy. Numerical models were presented for panels in compression and bending tests along with the method to calculate the results applying the Finite Element Method (FEM). These models were verified based on the results of experimental analyses to facilitate predictability for a new class of composite materials. It was shown that panels with a triple core are more resistant compared to panels with a single core. Moreover, these panels exhibit greater energy absorption capacity.

ACS Style

Jerzy Smardzewski. Wooden sandwich panels with prismatic core – Energy absorbing capabilities. Composite Structures 2019, 230, 111535 .

AMA Style

Jerzy Smardzewski. Wooden sandwich panels with prismatic core – Energy absorbing capabilities. Composite Structures. 2019; 230 ():111535.

Chicago/Turabian Style

Jerzy Smardzewski. 2019. "Wooden sandwich panels with prismatic core – Energy absorbing capabilities." Composite Structures 230, no. : 111535.

Journal article
Published: 26 August 2019 in Materials & Design
Reads 0
Downloads 0

Wood consumption is constantly being rationalized by the production of modern wood-based materials, especially honeycomb plates. Due to the beneficial properties of the auxetics, wooden honeycomb panels with auxetic cores can be used as structural elements. In particularly as walls and partitions in wooden houses, as well as shelves and bodies for cabinet furniture. Thus the aim of this study was to determine rigidity, strength and capacity to absorb energy in novel sandwich honeycomb boards manufactured from beech wood with oval cells of the auxetic core. Samples with honeycomb boards were subjected to uniaxial compression and three-point bending. Based on testing results it was shown that cores of oval cells exhibited auxetic properties and a strong orthotropy. Density of honeycomb panels is below 400 kg/m3, thus they may be classified as lightweight boards. Thanks to a high value of the modulus of linear elasticity and bending strength the designed board is a good substitute for traditional wood-based panels. During bending honeycomb panels with auxetic cores more effectively absorb energy compared to the same panels subjected to axial compression. These investigations provide the foundation for further studies on optimization of the board structure and its applicability in industrial practice.

ACS Style

Jerzy Smardzewski. Experimental and numerical analysis of wooden sandwich panels with an auxetic core and oval cells. Materials & Design 2019, 183, 108159 .

AMA Style

Jerzy Smardzewski. Experimental and numerical analysis of wooden sandwich panels with an auxetic core and oval cells. Materials & Design. 2019; 183 ():108159.

Chicago/Turabian Style

Jerzy Smardzewski. 2019. "Experimental and numerical analysis of wooden sandwich panels with an auxetic core and oval cells." Materials & Design 183, no. : 108159.

Journal article
Published: 02 March 2019 in Composite Structures
Reads 0
Downloads 0

The aim of the present study was to initiate an investigation based on the design of a thin sandwich panel with an auxetic (i.e. exhibiting negative Poisson’s ratio) lattice core using wood composites and 3D print technology. The sandwich panels were fabricated by attaching the 3D LayWooden pyramidal truss structures to HDF face sheets with the PVCa adhesive. The mechanical strengths and failure mechanisms under bending load were estimated experimentally, analytically and numerically. The results showed that the mechanical properties of beams increase with an increasing inclination angle of struts and/or relative density of the core. No signs of damage were observed, such as face sheet crushing (FC) or wrinkling (FW), core member crushing (CB, CC) (delamination or fracture). Damage to the composites occurred due to shearing in the struts of the cells. The greatest rigidity was recorded for beams with a D-core. The data could provide insight into the design of optimized or near-optimized sandwich panels.

ACS Style

Jerzy Smardzewski; Krzysztof Witold Wojciechowski. Response of wood-based sandwich beams with three-dimensional lattice core. Composite Structures 2019, 216, 340 -349.

AMA Style

Jerzy Smardzewski, Krzysztof Witold Wojciechowski. Response of wood-based sandwich beams with three-dimensional lattice core. Composite Structures. 2019; 216 ():340-349.

Chicago/Turabian Style

Jerzy Smardzewski; Krzysztof Witold Wojciechowski. 2019. "Response of wood-based sandwich beams with three-dimensional lattice core." Composite Structures 216, no. : 340-349.

Journal article
Published: 02 February 2019 in Engineering Structures
Reads 0
Downloads 0

The aim of this study was to determine the mechanical properties of newly designed joints for frame furniture. The posts and rails of the joints were manufactured from glued HDF layer panels. The joints were manufactured from ABS using 3D printing technology. The stiffness and strength of the designed joints and assembly forces found in the joints were determined experimentally. The Finite Element Method was applied to calculate deflections, values of the factor of safety in joint elements and to map loads on the surfaces of the elements in contact. The results of experimental studies were compared with the data provided by numerical calculations. It was shown that the newly designed joints exhibit good mechanical properties. The most advantageous results were recorded for a double self-compression fastener. In the compression and tension test, this fastener showed the smallest differences in stiffness and strength.

ACS Style

Marcin Podskarbi; Jerzy Smardzewski. Numerical modelling of new demountable fasteners for frame furniture. Engineering Structures 2019, 185, 221 -229.

AMA Style

Marcin Podskarbi, Jerzy Smardzewski. Numerical modelling of new demountable fasteners for frame furniture. Engineering Structures. 2019; 185 ():221-229.

Chicago/Turabian Style

Marcin Podskarbi; Jerzy Smardzewski. 2019. "Numerical modelling of new demountable fasteners for frame furniture." Engineering Structures 185, no. : 221-229.

Journal article
Published: 25 January 2019 in Thin-Walled Structures
Reads 0
Downloads 0

Furniture users as a rule consider low prices, lower product weight and easy transport of furniture items to the intended location as obvious advantages. However, practically no studies in available literature are found to assess the effect of variable climate conditions on the stiffness of shelves and furniture made from honeycomb panels. The aim of this study was to determine the effect of these changes on the value of Young's modulus and on the stiffness of whole furniture units subjected to torsional loads. Tests were performed on furniture units, which elements were manufactured in five structural design variants. It was shown that the applied materials retain high quality of the furniture units only at the temperature T = 26 °C and humidity H = 40%. An increase in the values of these climate parameters to T = 28 °C and H = 85% results in a drastic deterioration of furniture quality.

ACS Style

J. Smardzewski; D. Kramski. Modelling stiffness of furniture manufactured from honeycomb panels depending on changing climate conditions. Thin-Walled Structures 2019, 137, 295 -302.

AMA Style

J. Smardzewski, D. Kramski. Modelling stiffness of furniture manufactured from honeycomb panels depending on changing climate conditions. Thin-Walled Structures. 2019; 137 ():295-302.

Chicago/Turabian Style

J. Smardzewski; D. Kramski. 2019. "Modelling stiffness of furniture manufactured from honeycomb panels depending on changing climate conditions." Thin-Walled Structures 137, no. : 295-302.

Original paper
Published: 05 December 2018 in physica status solidi (b)
Reads 0
Downloads 0

Preliminary results on the influence of periodically distributed cylindrical nanoinclusions introduced into the f.c.c. hard sphere crystal on its elastic properties and the Poisson's ratio are presented. The nanoinclusions are oriented along the [001]‐direction and filled with hard spheres of diameter different from the spheres forming the matrix crystal. The Monte Carlo simulations show that symmetry of the crystal changes from the cubic to tetragonal one. In the case when spheres inside the inclusion are smaller than spheres forming the crystal, the changes of Poisson's ratio are qualitatively similar to the changes observed earlier in the Yukawa sphere crystal, that is, the introduction of nanochannels causes simultaneous decrease of the Poisson's ratio in the [110][1 1¯0]‐direction, and its increase in [110][001]‐direction. Filling the nanochannel with spheres having diameters greater than that of the spheres in the crystalline matrix, causes a decrease of the Poisson's ratio value from 0.065 down to −0.365 in [111][11 2¯]‐direction. The dependence of the minimal Poisson's ratio on the direction of the applied load is shown in a form of surfaces in spherical coordinates, for selected values of nanochannel particle diameters. The most negative value of the Poisson's ratio found amongst all systems studied was as low as −0.873.

ACS Style

Jakub W. Narojczyk; Krzysztof W. Wojciechowski; Konstantin V. Tretiakov; Jerzy Smardzewski; Fabrizio Scarpa; Pawel M. Piglowski; Mikolaj Kowalik; Attila R. Imre; Mikolaj Bilski. Auxetic Properties of a f.c.c. Crystal of Hard Spheres with an Array of [001]-Nanochannels Filled by Hard Spheres of Another Diameter. physica status solidi (b) 2018, 256, 1 .

AMA Style

Jakub W. Narojczyk, Krzysztof W. Wojciechowski, Konstantin V. Tretiakov, Jerzy Smardzewski, Fabrizio Scarpa, Pawel M. Piglowski, Mikolaj Kowalik, Attila R. Imre, Mikolaj Bilski. Auxetic Properties of a f.c.c. Crystal of Hard Spheres with an Array of [001]-Nanochannels Filled by Hard Spheres of Another Diameter. physica status solidi (b). 2018; 256 (1):1.

Chicago/Turabian Style

Jakub W. Narojczyk; Krzysztof W. Wojciechowski; Konstantin V. Tretiakov; Jerzy Smardzewski; Fabrizio Scarpa; Pawel M. Piglowski; Mikolaj Kowalik; Attila R. Imre; Mikolaj Bilski. 2018. "Auxetic Properties of a f.c.c. Crystal of Hard Spheres with an Array of [001]-Nanochannels Filled by Hard Spheres of Another Diameter." physica status solidi (b) 256, no. 1: 1.

Journal article
Published: 01 February 2018 in BioResources
Reads 0
Downloads 0

One likely reason why cross-laminated timber (CLT) panels are not applied in furniture designing is their unaesthetic appearance, with a crosswise arrangement of layers visible on narrow surfaces of furniture panels. The objective of this investigation was to manufacture and determine physic-mechanical properties of solid and cell Longitudinally-Laminated Timber (LLT) panels. The cognitive goal of the performed experiments was to determine orthotropy, linear elasticity moduli, and bending strength of LLTs. It was also decided to ascertain swelling coefficients of composites caused by changes in air humidity. Advantageous MOE and MOR values of LLTs were determined in relation to similar solid panels. In addition, it was demonstrated that, for furniture panel designing, it was rational to employ facings from beech wood as well as cores from beech wood free from anatomical defects.

ACS Style

Jerzy Smardzewski; Karol Łabeda. Mechanical and Hygroscopic Properties of Longitudinally-Laminated Timber (LLT) Panels for the Furniture Industry. BioResources 2018, 13, 2871-2886 .

AMA Style

Jerzy Smardzewski, Karol Łabeda. Mechanical and Hygroscopic Properties of Longitudinally-Laminated Timber (LLT) Panels for the Furniture Industry. BioResources. 2018; 13 (2):2871-2886.

Chicago/Turabian Style

Jerzy Smardzewski; Karol Łabeda. 2018. "Mechanical and Hygroscopic Properties of Longitudinally-Laminated Timber (LLT) Panels for the Furniture Industry." BioResources 13, no. 2: 2871-2886.

Journal article
Published: 01 May 2017 in Composite Structures
Reads 0
Downloads 0
ACS Style

Jerzy Smardzewski; Michał Słonina; Michał Maslej. Stiffness and failure behaviour of wood based honeycomb sandwich corner joints in different climates. Composite Structures 2017, 168, 153 -163.

AMA Style

Jerzy Smardzewski, Michał Słonina, Michał Maslej. Stiffness and failure behaviour of wood based honeycomb sandwich corner joints in different climates. Composite Structures. 2017; 168 ():153-163.

Chicago/Turabian Style

Jerzy Smardzewski; Michał Słonina; Michał Maslej. 2017. "Stiffness and failure behaviour of wood based honeycomb sandwich corner joints in different climates." Composite Structures 168, no. : 153-163.

Journal article
Published: 01 March 2017 in Holzforschung
Reads 0
Downloads 0

Light layer honeycomb panels could replace traditional wood materials, if their stiffness and strength properties could be improved. The aim of this research was to design and determine elastic properties of sandwich panels (SPs) based on a dual corrugated HDF core. Stiffness matrix values of elements were determined by a numerical method. The 3D calculation results were compared with those of the homogeneous model. The calculation results were collated with those of experimental investigations. It was demonstrated that the linear elasticity modulus as well as the modulus of rupture of the SPs were comparable with mechanical properties of a particle board with identical thickness, while the SP has a 1/3 lower density. The panel core exhibited significant orthotropic properties. In the xy plane it could be characterized as an auxetic structure. The homogeneous model leads to results similar to those achieved from the 3D model and observed in experimental tests.

ACS Style

Jerzy Smardzewski; Dorota Jasińska. Mathematical models and experimental data for HDF based sandwich panels with dual corrugated lightweight core. Holzforschung 2017, 71, 265 -273.

AMA Style

Jerzy Smardzewski, Dorota Jasińska. Mathematical models and experimental data for HDF based sandwich panels with dual corrugated lightweight core. Holzforschung. 2017; 71 (3):265-273.

Chicago/Turabian Style

Jerzy Smardzewski; Dorota Jasińska. 2017. "Mathematical models and experimental data for HDF based sandwich panels with dual corrugated lightweight core." Holzforschung 71, no. 3: 265-273.