摘要
结合实验讨论了残余应力对裂纹扩展作用的模型及其存在的问题．指出用公式ΔＫ＿（ｅｆｆ）＝（Ｋ＿（ｍａｘ）＋λＫ＿ｒ）－Ｋ＿（ｏｐ）可较准确地计算出残余压应力场中裂纹的扩展速率．残余压应力既使裂纹闭合力提高，又使最大应力强度因子降低，两者均使裂纹扩展驱动力ΔＫ＿（ｅｆｆ）减少，因而降低了裂纹的扩展速率．
Discussion with experiments was carried out on the model for the effect of residual stress upon crack growth. A rather accurate calculation of crack growth rate in a compressive residual stress field may be made by the equation:The compressive residual stress not only increases the crack closure force but also decreases the maximum stress intensity factor.Both reduce the ΔK_(eff) value and the crack growth driving force, thus the crack growth rate is decreased.HU Naisai, professor,(National Laboratory for Mechanical Behaviour of Metallic Materials,Xi'an Jiaotong University, Xi'an, 710049)
出处
《金属学报》
SCIE
EI
CAS
CSCD
北大核心
1994年第2期A065-A069,共5页
Acta Metallurgica Sinica
基金
国家自然科学基金
关键词
残余应力
裂纹扩展
疲劳裂纹
residual stress,short fatigue crack,crack growth rate
