CAJ | 학술논문

基于激光冲击强化LY12CZ航空铝合金的试验,采用显式动力学有限元软件ANSYS/LS-DYNA对激光冲击诱发的残余应力场进行数值模拟.对模拟中的关键问题,如加载历史、本构关系、网格划分、求解时间等进行了处理.对激光冲击强化后,冲击区表面和深度方向上的残余应力分布特点进行了分析.研究表明,在最佳激光峰值压力下,LY12CZ航空铝合金经激光冲击后,金属表面产生深度为0.5mm的残余压应力.模拟和试验结果相比,分布规律具有一致性,最大残余应力相差10.2%.获得的结果将为激光冲击强化过程的控制,和进一步的实验研究提供理论依据.
기우격광충격강화LY12CZ항공려합금적시험,채용현식동역학유한원연건ANSYS/LS-DYNA대격광충격유발적잔여응력장진행수치모의.대모의중적관건문제,여가재역사、본구관계、망격화분、구해시간등진행료처리.대격광충격강화후,충격구표면화심도방향상적잔여응력분포특점진행료분석.연구표명,재최가격광봉치압력하,LY12CZ항공려합금경격광충격후,금속표면산생심도위0.5mm적잔여압응력.모의화시험결과상비,분포규률구유일치성,최대잔여응력상차10.2%.획득적결과장위격광충격강화과정적공제,화진일보적실험연구제공이론의거.
Based on the laser shock processing experiment of aluminum alloy LY12CZ,the residual stress field induced was simulated by numerical analysis software ANSYS/LS-DYNA. The key problems including the loading history,the constitutive relation,the net division and the solving time etc were treated in the simulation and a mathematical model was established.The distributing characteristics of the residual stress on the surface and at the depth of the shocked area were analyzed.The results indicate that there was residual compressive stress 0.5mm under the surface.The simulation results were well agreed with the experimental results with the deviation of the magnitude of residual stresses being 10.2%.The simulation results obtained could provide the theoretical basis for controlling the laser shock processing and further experimental research.