Qiu Hai, Li Ying, Guo Tianfu, Tang Shan, Xie Zhaoqian, Guo Xu
State Key Laboratory of Structural Analysis for Industrial Equipment, International Research Center for Computational Mechanics, Department of Engineering Mechanics, Dalian University of Technology, Dalian 116024, China.
Department of Mechanical Engineering and Institute of Materials Science, University of Connecticut, Storrs, CT 06269, USA.
Materials (Basel). 2021 Mar 4;14(5):1205. doi: 10.3390/ma14051205.
Structural topology and loading condition have important influences on the mechanical behaviors of porous soft solids. The porous solids are usually set to be under uniaxial tension or compression. Only a few studies have considered the biaxial loads, especially the combined loads of tension and compression. In this study, porous soft solids with oblique and square lattices of circular voids under biaxial loadings were studied through integrated experiments and numerical simulations. For the soft solids with oblique lattices of circular voids, we found a new pattern transformation under biaxial compression, which has alternating elliptic voids with an inclined angle. This kind of pattern transformation is rarely reported under uniaxial compression. Introducing tensile deformation in one direction can hamper this kind of pattern transformation under biaxial loading. For the soft solids with square lattices of voids, the number of voids cannot change their deformation behaviors qualitatively, but quantitatively. In general, our present results demonstrate that void morphology and biaxial loading can be harnessed to tune the pattern transformations of porous soft solids under large deformation. This discovery offers a new avenue for designing the void morphology of soft solids for controlling their deformation patterns under a specific biaxial stress-state.
结构拓扑和加载条件对多孔软固体的力学行为有重要影响。多孔固体通常设置为承受单轴拉伸或压缩。只有少数研究考虑了双轴载荷，特别是拉伸和压缩的组合载荷。在本研究中，通过综合实验和数值模拟研究了在双轴载荷下具有圆形孔隙的倾斜和方形晶格的多孔软固体。对于具有圆形孔隙倾斜晶格的软固体，我们发现了双轴压缩下的一种新的图案转变，其具有交替的倾斜椭圆孔隙。这种图案转变在单轴压缩下很少被报道。在一个方向上引入拉伸变形会阻碍双轴载荷下的这种图案转变。对于具有方形孔隙晶格的软固体，孔隙数量不能定性地改变其变形行为，但可以定量地改变。总的来说，我们目前的结果表明，孔隙形态和双轴载荷可用于调节多孔软固体在大变形下的图案转变。这一发现为设计软固体的孔隙形态以控制其在特定双轴应力状态下的变形模式提供了一条新途径。
