UHMWPE 的应变率效应及其对超高速碰撞特性的影响

To analyze the strain rate effect and its influence on the dynamic response of ultra-high molecular weight polyethylene (UHMWPE) subjected to hypervelocity impact, the stress-strain relation of UHMWPE at different strain rates loading were obtained through universal material testing machine and Hopkinson bar experimental system. Furthermore, strain rate effect on the hypervelocity impact response was analyzed by numerical simulation. The results show that the tensile modulus and strength increase with the rise of strain rate. With the increase of the strain rate sensitivity index, the energy absorption ratio of the protective structure against the projectile decreases at the beginning followed by an increasing trend.