摘要
铝合金焊接结构是航天领域的常用结构。实验过程中焊接接头出现了低强度破坏,主要是由焊接接头变形不协调引起的。为了更好地研究焊接接头的破坏机理,采用纳米压痕实验和微拉伸实验对焊接接头的微区材料力学性能进行实验研究,得到焊接接头不同区域的弹性模量、屈服极限、强度极限、延伸率的分布规律。分析了自焊缝中心向母材区域过渡时各力学性能的变化趋势,本文结果可为焊接接头破坏机理的研究提供数据基础。
Aluminum alloy welded structure is a common structure in aerospace field.In experimental process,low strength failure appeared at the welded joint,which is mainly caused by the incompatible deformation of welded joint.In order to better study the failure mechanism of welded joint,nanoindentation experiment and micro tensile experiment were adopted to study the mechanical properties of material in welded joint micro-zone.The distribution of elastic modulus,yield limit,ultimate strength and ductibility in different areas of welded joint was obtained,the variation tendency of mechanical property in the transition area from weld center to base material was analyzed,which provides the data base for study of welded joint failure mechanism.
出处
《实验力学》
CSCD
北大核心
2017年第6期811-817,共7页
Journal of Experimental Mechanics
基金
国家自然科学基金(11472020)资助
北京市科协金桥工程种子资金(基金项目代号:ZZ16001)
关键词
铝合金
焊接接头
力学性能
纳米压痕实验
微拉伸实验
aluminum alloy
welded joint
mechanical properties
nano-indentation experiment
microtensile experiment
