Micro-holes’ effect on energy absorption ability in three-dimensional brittle materials under impact loading: A preliminary research

Abstract

Brittle protective structures often fracture under shock wave compression, which will have a constraining effect on their structural design. A suitable three-dimensional micro-hole shape can improve the brittle materials' energy absorption ability. This paper uses a three-dimensional lattice point-spring model with rotating angle to study the effect of micro-holes’ shape and arrangement on energy absorption ability in three-dimensional brittle materials. In this paper, a three-dimensional lattice point-spring model with rotating angle is used to examine the effect of the micro-holes’ shape and arrangement on the three-dimensional brittle materials’ energy absorption ability. This model can effectively simulate brittle material’s elastic and fracture characteristics. The research results demonstrate that the evolution of the shock wave profile is strongly affected by the shape of the micro-holes. When arranged in a regular triangular prism, the concave decahedral holes, which have a negative Poisson’s ratio, can cause a strong impact deformation and have a good energy absorbing ability. This paper’s results can provide some ideas for designing brittle structures with the best impact resistance.