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)
参考文献
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| [3] | ParkerAP．ASTMSTP776,1982:132林立,胡奈赛,何家文．材料科学进展,1990 |
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