摘要
无匙孔搅拌摩擦点焊可靠性分析中,考虑焊点边缘处存在宏观裂纹对接头力学性能的影响,引入内聚力模型,利用有限元分析软件ANSYS模拟6082-T6铝合金无匙孔搅拌摩擦点焊接头剥离过程中裂纹的扩展规律。结果表明:在拉伸速度v=2 mm/min时,裂纹起源于搭接界面焊点边缘外侧,在拉伸位移不断增加的过程中,焊点边缘处的应力、应变不断增加,裂纹沿搭接界面向焊点内部扩展。通过分析6082-T6铝合金无匙孔搅拌摩擦点焊接头剥离断口形貌,发现剥离裂纹起源处与模拟结果一致,且最终在搅拌区边缘处断裂。
In the reliability study of non-keyhole friction stir spot welding,considering the effect of macro cracks existing at the edge of joint on the mechanical properties of the joints,the cohesive zone model and finite element analysis software ANSYS were adopted to simulate the crack propagation rules in the cross-tension process of 6082-T6 aluminum alloy welded by nonkeyhole friction stir spot welding. The results show that when tensile speed v=2 mm/min,cracks originate from the outside of joint interface. The stress and strain increase with the tensile displacement increasing,cracks expand into joint along the interface.The observation of joint fracture morphology of 6082-T6 aluminum alloy welded by non-keyhole friction stir spot welding shows that the place where cracks originate is consistent with that obtained by the simulation results and fracture finally occurs at the stir zone edge.
出处
《兵器材料科学与工程》
CAS
CSCD
北大核心
2016年第2期13-16,共4页
Ordnance Material Science and Engineering
基金
国家自然科学基金资助项目(51265030)
关键词
内聚力模型
裂纹扩展
无匙孔搅拌摩擦点焊
cohesive zone model
crack propagation rules
non-keyhole friction stir spot welding
