炸药截面尺寸对爆炸消除焊接残余应力效果的影响及数值模拟

Influence of section size of explosive on effect of welding residual stress relieved by explosive and its numerical simulation

通过对爆炸消除焊接残余应力过程中炸药爆炸产生的冲量进行理论分析,解释了在相同炸药参数及布药方式条件下,条状布药的药条宽度比药条厚度对爆炸消除焊接残余应力效果影响更大的现象;同时确定了药条宽度与药条厚度之间的关系,给出了药条宽度的计算式。在对焊接温度场和应力场进行间接耦合求解焊接残余应力的基础上,利用ANSYS/LS-DYNA非线性有限元分析软件对不同药条截面尺寸炸药爆炸消除焊接残余应力的过程进行数值模拟,模拟结果表明,当条状布药的药宽相同且大于两倍的药厚时,随着药厚的增加,爆炸产生的冲量不变,焊接残余应力消除量基本相同;当条状布药的药厚相同时,随着药宽的增加,爆炸产生的冲量增加,焊接残余应力消除量增加。

Through the theoretical analysis of the impulse generated during the relieving process of the residual stress by the explosion, it is explained that at the same explosive parameters and the mode of distribution, the effect of the width of the strip on the residual stress relieving is larger than that of the thickness of the strip. At the same time, the relationship between the width of the strip and the thickness of the strip was determined, and the calculation formula of the width of the strip was given. Based on the indirect coupling of welding temperature field and stress field to solve the welding residual stress, the ANSYS/ LS-DYNA nonlinear finite element analysis software was used to simulate the process of relieving residual stress at different explosives of different cross-section explosives. The results show that when the width of the strips is the same and more than twice the thickness of the explosive, as the thickness of the explosive increases, the impulse generated by the explosion does not change, and the level of welding residual stress is basically the same. When the thickness is the same, as the width of the explosive increases, the impulse generated by the explosion increases, and the level of welding residual stress is increased.