Abstract

Topologically interlocked materials (TIMs) are an emerging class of architectured materials that each of block is supported by their neighboring blocks without any connector, which is inspired by microstructures observed in nature. Therefore, they showed alluring attributes such as resistance to impact, toughness, high flexibility even when using brittle materials, and high crack propagation resistance. In these structures, the presence of lateral compressive force, applied on peripheral blocks, ensures the integrity and identified properties. Lateral load, however, can adversely affect TIM plates and cause instability, and initiate buckling. In the present study, to focus on the buckling behavior of TIM plates due to the lateral force, a finite element model of TIM plates, made of tetrahedral blocks, was first validated using numerical results available in the literature and then analyzed. In this regard, an appropriate procedure has been presented to simulate the possible instability of these structures. Unlike monolithic plates, geometric parameters of TIM plates are dependent and this makes their parametric study more challenging. Therefore, some case studies have been accomplished to illustrate the effect of diverse parameters. The current study indicates that increasing the assembly plate length and decreasing its thickness causes a reduction of buckling load; nevertheless, it is necessary to mention that the thickness variation is a more impressive factor.

摘要

拓扑互锁材料 (TIM) 是一类新兴的建筑材料，每个块都由相邻的块支撑，没有任何连接器，其灵感来自自然界观察到的微观结构。因此，它们显示出诱人的特性，例如抗冲击性、韧性、即使在使用脆性材料时也具有高柔韧性，以及高抗裂纹扩展性。在这些结构中，施加在外围块上的横向压缩力的存在确保了完整性和可识别的特性。然而，横向载荷会对 TIM 板产生不利影响并导致不稳定，并引发屈曲。在本研究中，为了关注侧向力引起的 TIM 板的屈曲行为，TIM 板的有限元模型由四面体块制成，首先使用文献中可用的数值结果进行验证，然后进行分析。在这方面，已经提出了一个适当的程序来模拟这些结构可能存在的不稳定性。与整体板不同，TIM 板的几何参数是相关的，这使得它们的参数研究更具挑战性。因此，已经完成了一些案例研究来说明不同参数的影响。目前的研究表明，增加装配板长度和减小其厚度会导致屈曲载荷降低；然而，有必要提到厚度变化是一个更令人印象深刻的因素。与整体板不同，TIM 板的几何参数是相关的，这使得它们的参数研究更具挑战性。因此，已经完成了一些案例研究来说明不同参数的影响。目前的研究表明，增加装配板长度和减小其厚度会导致屈曲载荷降低；然而，有必要提到厚度变化是一个更令人印象深刻的因素。与整体板不同，TIM 板的几何参数是相关的，这使得它们的参数研究更具挑战性。因此，已经完成了一些案例研究来说明不同参数的影响。目前的研究表明，增加装配板长度和减小其厚度会导致屈曲载荷降低；然而，有必要提到厚度变化是一个更令人印象深刻的因素。