晶粒尺寸对疲劳应力强度因子门坎值的影响
赵宝荣
摘要(Abstract)：
本文探讨了PCrNilMoVA及PCrNi3MoVA钢的晶粒尺寸和疲劳应力强度因子门坎值△K_(th)之间的关系。实验结果表明,随d增大,△K_(th)也相应地增大。 文中基于位错理论,提出疲劳应力强度因子门坎值△K_(th)由两部分组成,即:△K_(th)=△K_(th)~*+△K_(th)~d,△K_(th)~*与晶粒尺寸无关;△K_(th)~d表示使裂纹尖端激发出来的位错能够到达晶界的条件,它与√d呈正比关系。模型与实验结果相一致。
关键词(KeyWords)：
基金项目(Foundation):
作者(Author): 赵宝荣
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DOI: 10.14024/j.cnki.1004-244x.1989.06.013
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