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. 2020 Sep 24;13(19):4252.
doi: 10.3390/ma13194252.

Experimental and Numerical Study on Withdrawal Strength of Different Types of Auxetic Dowels for Furniture Joints

Ali Kasal  1 , Tolga Kuşkun  1 , Jerzy Smardzewski  2
Affiliations

Experimental and Numerical Study on Withdrawal Strength of Different Types of Auxetic Dowels for Furniture Joints

Ali Kasal et al. Materials (Basel). .

Abstract

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.

Keywords: FEM; auxetic; contact pressure; dowel joints; friction; withdrawal strength.

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Conflict of interest statement

The authors declare no conflict of interest.

Figures

Figure 1
Figure 1
Dimensions and real picture of the tensile test samples.
Figure 2
Figure 2
Measuring the displacements by using the pattern matching method: (a) virtual strain gauges, (b) limits of linear elasticity and plasticity for PA12.
Figure 3
Figure 3
Dimensions (in mm) of auxetic inclusions (a) and cross-sections (b) of the dowels.
Figure 4
Figure 4
Pre-production of the dowels with 3D printing technology.
Figure 5
Figure 5
General view (a) and dimensions (b) of designed dowels and muff (in mm).
Figure 6
Figure 6
Dimensions (a) and real pictures (b) of all samples.
Figure 7
Figure 7
Geometry of samples for mounting tests: (a) loading, (b) measuring of strains.
Figure 8
Figure 8
Geometry of samples for withdrawal tests: (a) loading, (b) real test.
Figure 9
Figure 9
Model of the pressed joint with dowels have hole.
Figure 10
Figure 10
One-quarter of the FEM model (a) and contact surfaces in joints (b).
Figure 11
Figure 11
Cross-sectional area of dowels depends on the inclusion size and hole diameter (in mm2).
Figure 12
Figure 12
Mean comparison results of withdrawal strength values of the dowels.
Figure 13
Figure 13
Relationship between load and displacement. Comparison of the experimental (E) and numerical (F) results: (a) dowels A type, (b) dowels B type, (c) dowels C type, (d) dowels D type.
Figure 14
Figure 14
Relationship between contact pressure and displacement: (a) dowels A type, (b) dowels B type, (c) dowels C type, (d) dowels D type.
Figure 15
Figure 15
Contact pressure distribution during the withdrawal force: auxetic (top) and RF (bottom) dowels.
Figure 16
Figure 16
Stress distribution of dowels during the withdrawal forces for auxetic (top) and RF (bottom).
See this image and copyright information in PMC

References

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