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Modeling the influence of connecting elements in wood products behavior: a numerical multi-scale approach

机译：建模连接元件在木制品行为中的影响：数值多尺度方法

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摘要

Wood furniture is often composed of simple parts that may be modeled as beams or plates. These particularities allow using simplified approaches that reduces the number of degrees of freedom (dof for short) in a finite element simulation of the furniture's behavior. Generally, connections are not taken into account in such simulations but these connections are critical in the failure process of the furniture and it worth studying it precisely. Using amulti-scale approach, this paper introduces a numerical procedure to identify the connection contribution in the furniture's stiffness. Comparing 3D finite element calculations with a Timoshenko's beam calculation on a corner of two wooden parts, we identify the specific behavior of the connection elements (pins, nut, screw ... and local 3D effects) to introduce it as a punctual 0D element in the beam code. Two validations of the approach are presented here: (i) a numerical validation by comparing the result of the beam code with a complete 3D finite element simulation on a representative plane structure of wooden furniture; (ii) an experimental validation by managing a global bending test and measuring the displacement field using digital image correlation (DIC for short).
机译：木制家具通常由可以以梁或板材建模的简单部件组成。这些特殊性允许使用简化的方法在家具行为的有限元模拟中减少自由度（简短的DOF）的数量。通常，在这种模拟中没有考虑连接，但这些连接在家具的故障过程中至关重要，值得精确地研究。本文介绍了尺寸尺度方法，介绍了一种识别家具僵硬的连接贡献的数值手术。比较3D有限元计算与Timoshenko的光束计算在两个木制部分的角落上，我们识别连接元件（引脚，螺母，螺钉...和本地3D效果）的具体行为，将其作为准时的0d元素介绍光束代码。此处提供了两种方法的验证（ii）使用数字图像相关（简短的DIC）管理全局弯曲测试和测量位移场的实验验证。

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