A New Find in Experimental Research on Coalescence Between Two Holes in Aluminum Alloy Strip under Cyclic Tensile Loading

WANG Fangwen; CHEN Yiheng

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A New Find in Experimental Research on Coalescence Between Two Holes in Aluminum Alloy Strip under Cyclic Tensile Loading

更新时间：2025-05-08

- A New Find in Experimental Research on Coalescence Between Two Holes in Aluminum Alloy Strip under Cyclic Tensile Loading
- Vol. 43, Issue 1, Pages: 125-128(2009)
- 作者机构：
  
  西安交通大学航天航空学院,西安,710049
- 作者简介：
- 基金信息：
- DOI：
  CLC： O346.4
- Online First：10 January 2009，
  
  Published：2009
- 稿件说明：
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WANG Fangwen, CHEN Yiheng. A New Find in Experimental Research on Coalescence Between Two Holes in Aluminum Alloy Strip under Cyclic Tensile Loading[J]. 2009, 43(1): 125-128.
DOI：

WANG Fangwen, CHEN Yiheng. A New Find in Experimental Research on Coalescence Between Two Holes in Aluminum Alloy Strip under Cyclic Tensile Loading[J]. 2009, 43(1): 125-128. DOI：

摘要

对航空铝合金薄板在疲劳载荷下的两个相邻孔洞聚合进行了详细的试验研究.最初预计初始的疲劳裂纹应该在两个相邻孔洞之间的区域产生

并且导致两个相邻孔洞聚合为一个复杂的新缺陷

但是试验结果却发现:在某些情况下

初始的疲劳裂纹产生在远离两个相邻孔洞之间区域的外区域

即不是产生在两个相邻孔洞之间区域的内边缘上

而是产生在外边缘上

只有当这条初始裂纹在疲劳载荷下扩展一定长度并止裂一段时间后

在两个相邻孔洞之间的内区域才产生第二条裂纹

该第二条裂纹的扩展才引起聚合的发生

而在第二条裂纹扩展期间

第一条裂纹始终处于止裂状态.这个现象超出了经典的疲劳裂纹萌生的基本理论

也无法用经典的应力集中理论来解释.

Abstract

This note reports an interesting phenomenon found in authors' experimental investigation to the coalescence between two neighborly located holes in an aluminum alloy strip under cyclic tensile loadings. Unlike expected

the initial fatigue crack was found not to nucleate in the center region between the two holes

where the stress concentration is much higher than the other positions

rather

the initial crack always nucleated at the outside rim of holes far apart from the center region. The coalescence between the two holes always occurred far after the initial fatigue crack nucleation. This phenomenon cannot be explained by the classical theories.

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references

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