Effect of micro-hole shape and arrangement on the impact properties of three-dimensional isotropic brittle structures

Abstract

Brittle structures often fracture under shock wave compression, which will have a constraining effect on their structural design. By introducing and designing suitable three-dimensional micro-hole shapes, the ability of brittle structures to resist impacts can be effectively improved. This paper examines the impact characteristics of the three-dimensional isotropic brittle structure's micro-hole shape and arrangement using the lattice spring model with rotational freedom degrees. The model effectively simulates brittle materials’ mechanical properties and fracture characteristics and overcomes the lattice point-spring model's fixed Poisson's ratio limitation. The research results demonstrate that micro-hole shape strongly affects shock wave profile evolution. 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 a good energy absorbing effect. This paper’s results can provide some ideas for designing brittle structures with the best impact resistance.