Peridynamic analysis of indentation and impact of coated and uncoated electro-optical materials

摘要

A peridynamic model for sand impact damage has been developed. Model development has focused on simulatingimpacts of sand particles on ZnS traveling at velocities consistent with aircraft take-off and landing speeds. Themodel reproduces common features of impact damage including pit and radial cracks, and, under some conditions,lateral cracks. This study focuses on a preliminary application of the model to systems with coatings. Twodi erent coating materials were included in the modeling effort. The required material parameters of criticalstretch, which governs the material failure and fracture, and yield strength, were extracted from peridynamicsimulations of experimental results of indentation tests. The model was then applied to impact conditionsfor which experimental measurements of damage characteristics were available. Peridynamic approach enabledinvestigation of the mechanical properties of interfaces between the coatings and the substrate. This studydemonstrates current computational approach and its quantitative ability to simulate sand impact events.