东北大学学报（自然科学版）

东北大学学报(自然科学版) ›› 2004, Vol. 25 ›› Issue (8): 790-792.DOI: -

• 论著 • 上一篇    下一篇

钛合金焊缝金属表面疲劳短裂纹的分形研究

回丽;曹志韬;谢里阳;何雪浤   

  1. 东北大学机械工程与自动化学院;东北大学机械工程与自动化学院;东北大学机械工程与自动化学院;东北大学机械工程与自动化学院 辽宁沈阳　110004
  • 收稿日期:2013-06-24 修回日期:2013-06-24 出版日期:2004-08-15 发布日期:2013-06-24
  • 通讯作者: Hui, L.
  • 作者简介:-
  • 基金资助:
    国家重点基础研究发展规划项目(G19990650)

Fractal characteristics of short fatigue cracks on surface of weld metal for titanium alloy

Hui, Li (1); Cao, Zhi-Tao (1); Xie, Li-Yang (1); He, Xue-Hong (1)   

  1. (1) Sch. of Mech. Eng. and Automat., Northeastern Univ., Shenyang 110004, China
  • Received:2013-06-24 Revised:2013-06-24 Online:2004-08-15 Published:2013-06-24
  • Contact: Hui, L.
  • About author:-
  • Supported by:
    -

RichHTML

0

PDF (PC)

852

摘要： 采用覆型技术,对TC2钛合金焊缝金属表面疲劳短裂纹群体演化行为进行了实验研究,并应用分形理论对实验观测结果进行了分析·结果表明,钛合金焊缝金属表面群体疲劳短裂纹演化行为具有分形特征;随着疲劳进程中循环次数的不断增加,分形维数也随之增大,对应着材料的损伤在不断加剧;分形维数可以作为一个损伤变量,更好地描述材料的疲劳损伤及演化·

关键词: 钛合金, 焊缝金属, 疲劳短裂纹, 分形, 分形维数

Abstract: The grouping behaviour of short fatigue cracks on surface of the weld metal for TC2 titanium alloy was investigated according to the replicating experiment, and the replicas were analyzed on the basis of fractal theory. The results show that the feature of grouping behaviour of short fatigue crack satisfies fractal equation. The value of fractal dimension increases with the increase of the fatigue cycle frequency, and the value of fractal dimension can be regarded as a parameter to express better the fatigue damage and its evolution process.

中图分类号: