摘要
潜艇结构内广泛存在复杂分布的焊接残余应力,对焊接结构表面裂纹的扩展有很大的影响.利用权函数方法,结合Newman-Raju提出的表面裂纹在压弯组合应力下的经验公式,计算表面裂纹焊接残余应力的应力强度因子;并利用K相似原理,把表面裂纹问题转换为中心贯穿裂纹问题;利用Newman裂纹闭合模型模拟裂纹扩展,研究残余应力场内的裂纹闭合现象,并实现残余应力场内的裂纹扩展研究.该方法也可以用于随机载荷下残余应力场内裂纹扩展研究.
The residual stress of welding, which has great effect on fatigue crack growth, widely exists in submarine structures. A method is proposed to calculate crack growth in residual stress under random loads. Using the Newman-Raju experience formulation for surface crack under pressure and bending stress, weight function was adopted to calculate the stress intensity factors of welding residual stress. Then the K resemble theory was used to translate the surface crack to middle through crack. Crack closure in the residual stress field was studied by the Newman crack closure model.
出处
《哈尔滨工程大学学报》
EI
CAS
CSCD
北大核心
2006年第5期686-689,708,共5页
Journal of Harbin Engineering University
关键词
残余应力
裂纹闭合
权函数
K相似原理
residual stress
crack closure
weight function
K resemble theory
