摘要
用单边裂纹试样,研究了X60管线钢经预拉伸变形量为5%、10%和15%后的疲劳裂纹扩展特性。结果表明:随着预拉伸变形量的增加,疲劳裂纹扩展速率提高,尤其是在裂纹扩展的近门槛区。定量分析表明:预拉伸变形降低了疲劳裂纹扩展门槛值,提高了裂纹扩展系数,从而使管线在机械损伤的部位疲劳抗力降低。
In the present study, experimental investigations were carried out on the fatigue crack propagation characteristics of X60 pipeline steel after different degrees of pre-tension deformation (5%, 10%, 15%). Test results showed that the fatigue crack propagation rate increased with increasing the pre-tension deformation degree, especially at the near threshold section. The results of quantitative analysis showed that the pre-tension deformation reduced the fatigue crack propagation threshold and increased the crack propagation coefficient, and consequently decreased the fatigue resistance of the part with mechanical damage.
出处
《机械工程材料》
CAS
CSCD
北大核心
2004年第7期18-20,共3页
Materials For Mechanical Engineering
基金
江苏省高新技术产业化资助项目(JH01-071)
关键词
疲劳
裂纹扩展
预变形
门槛值
管线钢
fatigue
crack propagation
pre-deformation
threshold
pipeline steel
