Point loading of assemblies of interlocked cube-shaped elements
Point loading of assemblies of interlocked cube-shaped elements
复制标题
互锁立方体元件组件的点载荷
DOI：
10.1016/j.ijengsci.2008.06.012
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发表时间：
2008
影响因子：
6.6
通讯作者：
A. Kanel
中科院分区：
文献类型：
--
作者：
S. Schaare;A. Dyskin;Y. Estrin;S. Arndt;E. Pasternak;A. Kanel
最近开发了一种新概念，即由相同的凸元件通过其几何形状和空间排列而互锁来组装层状结构。特别地，相同的立方体可以布置在这种类型的组件中，使得它们都不能从结构中移除。这是通过相邻元件施加的运动学约束来实现的，前提是用约束框架替代沿组件外围的邻居。我们报告的实验结果和数值模拟结果表明，此类组件对平面外点载荷（压痕）表现出高度非线性响应，特别是明显的加载/卸载滞后、峰值后软化、卸载阶段的负刚度以及不可逆旋转的局部化。模拟结果证实，观察到的异常机械响应是此类组件固有的、与材料无关的特性。
A new concept of assembling layer-like structures from identical convex elements interlocked by virtue of their geometry and spatial arrangement was developed recently. In particular, identical cubes can be arranged in this type of assembly, such that none of them can be removed from the structure. This is achieved through the kinematic constraint imposed by the neighbouring elements, provided that a constraining frame substitutes for neighbours along the periphery of the assembly. We report experimental results and the results of numerical simulation showing that such assemblies exhibit a highly non-linear response to out-of-plane point loads (indentation), in particular a pronounced loading/unloading hysteresis, post-peak softening, a negative stiffness in the stage of unloading and localisation of irreversible rotations. The results of the simulations confirm that the observed unusual mechanical response is an intrinsic, material-independent property of such assemblies.