7075铝合金厚板预拉伸模拟分析及其在淬火残余应力消除中的应用

运用有限元软件ABAQUS, 对7075铝合金板材淬火过程进行了模拟.比例件的加工变形表明淬火模拟所得的残余应力是可信的.在获得淬火残余应力的基础上, 模拟了不同预拉伸量对毛坯的淬火残余应力的消除.结果表明: 拉伸量为3%时, 毛坯产生2.1%～2.6%的永久变形, 残余应力消除量约为86%, 完全符合航空铝合金厚板生产工艺的规定.

Pre-stretching process and its application in reducing residual stress of quenched 7075 aluminum alloy thick-plates

A quenching process of 7075 aluminum plates was simulated by ABAQUS-a powerful FEA program. To verify the simulation result of quenching process, a reduced-scale part was machined and tested. The result between FEA and experiment was discovered accordantly. With FEA based quenched stress, different stress distributions were obtained under different conditions of pre-stretching. The research shows that the blank is pre-stretched about 3%, the magnitude of plastic strain is between 2.1%2.6%, and the quenched-stress is removed about 86%. All these quantities agree well with the manufacturing technics of aviation aluminum alloy thick-plate.