摘要
采用弹塑性有限元方法研究了平面应变条件下裂纹位于焊缝中心不同强度匹配和裂纹深度焊接接头的裂端应力三轴性 .结果发现 ,与均匀材料相比 ,同等载荷水平下 ,高匹配接头裂端应力三轴性降低 ,低匹配接头裂端应力三轴性升高 ;随裂纹变浅 ,应力三轴性降低 ,强度匹配的影响也更为显著 .从焊缝和母材塑性变形与应变硬化交互作用方面进行了解释 .
The investigation of the crack tip stress triaxiality of welded joint containing a central crack in the weld metal whose yield strength and crack depth may be varied using an elasto plastic finite element methodunder plain strain, and reveal that the stress triaxiality ahead of crack tip tends to increase for under matched weld and decrease for over matched weld using the even matching case as a references and as the crack length reduced for a given specimen width, the stress triaxiality decrease accordingly and the effect of strength mis matching becomes more obvious, and these can be explained in terms of plastic deformation and strain hardening interaction between weld metal and base material.
出处
《材料科学与工艺》
EI
CAS
CSCD
2000年第1期25-29,共5页
Materials Science and Technology
基金
中国博士后科学基金
关键词
焊接接头
应力三轴性
裂纹深度
有限元分析
weldment
stress triaxiality
strength mis matching
crack depth
finite element method
