激光冲击波加载金属材料中心压应力缺失效应  

Central residual compressive stress drop on metal materials after laser induced shock wave

作　　者：王波[1] 陈东林[1] 周留成[1] 何卫锋[1] 

机构地区：[1]空军工程大学航空航天工程学院,陕西西安710038

出　　处：《红外与激光工程》2014年第11期3521-3526,共6页Infrared and Laser Engineering

基　　金：国家自然科学基金(51205406)

摘　　要：纳秒脉冲、千兆瓦级激光辐照金属材料产生高压等离子体冲击波,作用于金属材料表面并向内传播,产生残余压应力场。但在单次冲击加载时,残余压应力场中心出现的残余压应力值小于加载边缘,应用理论分析和实验测试的方法解释了这一过程,并结合激光诱导冲击波Fabbro方程和TC4钛合金动态响应模型,建立了不同形式冲击波加载TC4钛合金的数值仿真模型,分析了冲击波压力、作用时间和加载形式对中心压应力缺失的影响。The high pressure plasma shock wave induced by nanosecond pulse and 1 000 MW laser irradiation on the metal materials will propagate into the materials and impart residual compressive stresses. But when shock wave was singly loaded, the lower residual stress at the center of the loading zone compared to those away from the center will be induced. This process is proved by theorems and experiments. Moreover, the Fabbro equation of plasma shock wave and dynamic response of TC4 titanium alloy was calculated in the numerical model of different shock wave loading, the influence of the shock wave pressure, the actuation duration and the loading shape on residual stress drop at the center was discussed.

关 键 词：强激光 冲击波 残余压应力缺失 数值计算 

分 类 号：TG665[金属学及工艺—金属切削加工及机床]