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Investigation of the Effect of Inhomogeneous Material on the Fracture Mechanisms of Bamboo by Finite Element Method

机译：用有限元法测定非均匀材料对竹子骨折机制的影响

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摘要

Bamboo is a remarkably strong and sustainable material available for construction. It exhibits optimized mechanical characteristics based on a hollow-inhomogeneous structure which also affects its fracture behavior. In this study, the aim is to investigate the effect of material composition and geometrical attributes on the fracture mechanisms of bamboo in various modes of loading by the finite element method. In the first part of the investigation, the optimized transverse isotropy of bamboo to resist transverse deformation was numerically determined to represent its noticeable orthotropic characteristics which prevail in the axial direction. In the second part of this study, a numerical investigation of fracture mechanisms in four fundamental modes of loading, namely bending, compression, torsion, and shear, were conducted by considering the failure criterion of maximum principal strain. A crack initiation stage was simulated and compared by implementing an element erosion technique. Results showed that the characteristics of bamboo’s crack initiation differed greatly from solid geometry and homogeneous material-type models. Splitting patterns, which were discerned in bending and shear modes, differed in terms of location and occurred in the outside-center position and inside-lowermost position of the culm, respectively. The results of this study can be useful in order to achieve optimized strength in bamboo-inspired bionic designs.
机译：竹子是一种非常强大和可持续的材料，可用于建设。它基于空心不均匀的结构表现出优化的机械特性，这也影响其裂缝行为。在这项研究中，目的是探讨材料组成和几何属性对竹子骨折机制的各种装载方式的骨折机制。在调查的第一部分中，数值确定竹子的优化横向各向同性以抵抗横向变形，以表示其沿轴向占上棱镜的显着正交特性。在本研究的第二部分，通过考虑最大主要菌株的故障标准，进行四种基本载荷模式，即弯曲，压缩，扭转和剪切的裂缝机制的数值研究。通过实施元素侵蚀技术来模拟和比较裂纹启动阶段。结果表明，竹子裂纹启动的特性从固体几何和均匀材料型模型差异很大。分裂图案，其被弯曲和剪切模式辨别，在位置而异，分别发生在外部位置和秆的内部位置。本研究的结果可用于实现竹制启发仿生设计中的优化强度。

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