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

Ali Kasal,Jerzy Smardzewski,Tolga Kuşkun

doi:10.3390/ma13194252

Ali Kasal, Jerzy Smardzewski + Show 1 more

Open Access

https://doi.org/10.3390/ma13194252

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Abstract

Studies on the application of 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, 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.

Highlights

The strength and stability of any structural type of furniture depends on the connections that hold its components together
The mechanical and elastic properties of the PA12 were determined according to the uniaxial tensile tests with 10 samples in accordance with the procedures described in ASTM D3039/D3039M–17 [29]
Experiments,two twodifferent different types failure were observed in the form of the dowels pulledIn types ofof failure were observed in the form of the dowels pulled-out out from the muff (RF,A5, A3,A7, A5,B7, A7,C7, B7,D5, C7,D7)

Summary

Introduction

The strength and stability of any structural type of furniture depends on the connections that hold its components together. Furniture components could be connected to each other with an extensive variety of glued or unglued joint techniques by using various types of fasteners, such as dowels, nails, screws, staples, eccentric connectors, metal or plastic connectors, etc. Glued dowel joints are the most popular method for joining the member together in furniture constructions. Wooden dowels are commonly used to join wood and wood-based materials together in many types of furniture construction. Dowel joints may be subjected to axial (withdrawal), shear, torsional, and bending forces; they should have sufficient strength to carry these loads. Many studies have been done for withdrawal strength and bending moment capacities of dowels from wood and wood-based materials. Results indicated that the plain and spiral-groove dowels give better face withdrawal strength than multi-groove dowels, and both face and edge withdrawal strength of the dowels linearly increased as the dowel penetration increased

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