Sensitivity analysis of the residual stress state in friction stir welding of high strength aluminum alloy
Sensitivity analysis of the residual stress state in friction stir welding of high strength aluminum alloy
复制标题
DOI：
10.3139/120.110809
复制
发表时间：
2015-12
影响因子：
2.5
通讯作者：
M. Bachmann;M. Rethmeier;Chuansong Wu
中科院分区：
文献类型：
--
作者：
M. Bachmann;M. Rethmeier;Chuansong Wu
摘要：本文对6mm厚铝合金AA2024-T3的搅拌摩擦焊接过程进行了数值研究。采用有限元软件COMSOL Multiphysics计算了不同机械夹紧条件和硬化模型下焊接过程的瞬态热场和力学反应。实现了一种热伪机械（TPM）热源。考虑了摩擦热引起的沉淀硬化溶解对材料的软化作用。将热电偶元件在不同位置测得的瞬态温度演变与数值结果进行了比较。对热场进行了较好的分析。力学模型的敏感性研究表明，夹紧条件和软化模型的影响较大。
Abstract In this paper, the friction stir welding process was numerically investigated for 6 mm thick aluminum alloy AA2024-T3. The finite element software COMSOL Multiphysics was used to calculate the transient thermal field during welding and the mechanical reaction depending on different mechanical clamping conditions and hardening models subsequently. A thermal pseudo-mechanical (TPM) heat source was implemented. Softening effects of the material due to precipitation hardening dissolution caused by the frictional heat were accounted for. The transient temperature evolution measured by thermocouple elements at various locations was compared to the numerical results. A good agreement was found for the thermal field. A sensitivity study of the mechanical models showed the strong influence of the clamping conditions and the softening model.