非晶涂层薄带爆炸焊接上限分析

Upper limit of coated amorphous foils explosive welding

关键词:  爆炸焊接上限  拉伸波  热软化  界面强度

Key words:  explosive welding upper limits  tensile wave  thermo-softening  interface strength

摘要:

将薄带爆炸焊接温度场简化为一维物体非稳态热传导情形,给出温度随时间变化的分布解,并引入温升热软化模型,根据拉伸波到达界面时的温度值确定焊接界面上的结合强度,再综合考虑非晶材料的晶化限及涂层与基体界面的结合强度,给出控制非晶薄带涂层爆炸焊接上限的三个重要因素。最后分析了铁基非晶涂铜薄带的爆炸焊接上限,将损伤力学的理念引入试验装置的设计中,通过LS-DYNA模拟得到拉伸波强度与层间碰撞速度的关系,再由以上三个因素分别计算得到焊接上限,并取最小值以确保共同满足。

Abstract:

The temperature field of foil explosive welding was simplified to one dimension non-steady heat conduction, the temperature of welding interfaces was given and changed with time.With introduction of the thermo-softening model at welding interfaces and according to the time of the tensile wave arrived at the interface, the binding strength can be confirmed.Analy ses indicate that the material crystallized limit and binding strength of coating material with based metal and welding interface are the most important factors, which control the upper limit of explosive welding.The Fe-based amorphous foil coated with copper was researched.During the experiment designing, ideas of damage mechanics were used to set defects to accelerate the decaying of tensile wave.The relationship between the tensile wave strength and impact velocity was simulated by LSDYNA, then the three upper limits were caclculated by the important factors, and the minimum of them was the upper limits.