CAJ | 학술논문

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。
납초맥충、천조와급격광복조금속재료산생고압등리자체충격파，작용우금속재료표면병향내전파，산생잔여압응력장。단재단차충격가재시，잔여압응력장중심출현적잔여압응력치소우가재변연，응용이론분석화실험측시적방법해석료저일과정，병결합격광유도충격파Fabbro방정화TC4태합금동태향응모형，건립료불동형식충격파가재TC4태합금적수치방진모형，분석료충격파압력、작용시간화가재형식대중심압응력결실적영향。
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.