东北大学学报（自然科学版）

东北大学学报(自然科学版) ›› 2008, Vol. 29 ›› Issue (11): 1568-1571.DOI: -

• 论著 • 上一篇    下一篇

400MPa超级钢疲劳裂纹扩展速率

高彩茹;刘相华;杜林秀;贾坤宁;   

  1. 东北大学轧制技术及连轧自动化国家重点实验室;
  • 收稿日期:2013-06-22 修回日期:2013-06-22 出版日期:2008-11-15 发布日期:2013-06-22
  • 通讯作者: Gao, C.-R.
  • 作者简介:-
  • 基金资助:
    国家高技术研究发展计划项目(2003AA33G010);;

Crack propagation rate of 400 MPa super-steel strip

Gao, Cai-Ru (1); Liu, Xiang-Hua (1); Du, Lin-Xiu (1); Jia, Kun-Ning (1)   

  1. (1) State Key Laboratory of Rolling and Automation, Northeastern University, Shenyang 110004, China
  • Received:2013-06-22 Revised:2013-06-22 Online:2008-11-15 Published:2013-06-22
  • Contact: Gao, C.-R.
  • About author:-
  • Supported by:
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摘要： 采用PLG-100高频疲劳试验机,在试验频率为80 Hz条件下,应用三点弯曲法对400 MPa超级钢板进行了裂纹扩展速率实验;绘制出ANS400裂纹扩展速率da/dN与应力强度因子幅ΔK之间的关系曲线;利用Origin7.0软件,采用线性拟合的方法得出Paris方程中的系数C=9.4×10-12mm/次,m=4.47.计算得出ANS400钢的裂纹扩展门槛值ΔKth为7.98 MPa.m1/2.

关键词: 超级钢, 疲劳裂纹, 扩展速率, 应力强度因子幅, 裂纹扩展门槛值

Abstract: On the high-frequency fatigue tester PLG-100, the crack propagation rate of 400 MPa super-steel strip was tested at 80 Hz by three-point bending method. The relationship between the propagation rate da/dN and the amplitude of stress intensity factor was given. Then, with the software Origin 7.0 in combination with linear fitting, the coefficient C and m in Paris equation were determined as C=9.4 × 10-12 mm each time and 4.47respectively, and the threshold value of crack propagation ΔKth was 7.98 MPa·m1/2 through calculation.

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