A New Find in Experimental Research on Coalescence Between Two Neighbor Cracks in a Copper Strip under Cyclic Tensile Loadings

王芳文; 陈宜亨

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A New Find in Experimental Research on Coalescence Between Two Neighbor Cracks in a Copper Strip under Cyclic Tensile Loadings

更新时间：2025-12-08

- A New Find in Experimental Research on Coalescence Between Two Neighbor Cracks in a Copper Strip under Cyclic Tensile Loadings
- Vol. 43, Issue 2, Pages: 121-124(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 February 2009，
  
  Published：2009
- 稿件说明：
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王芳文, 陈宜亨. A New Find in Experimental Research on Coalescence Between Two Neighbor Cracks in a Copper Strip under Cyclic Tensile Loadings[J]. 2009, 43(2): 121-124.
DOI：

王芳文, 陈宜亨. A New Find in Experimental Research on Coalescence Between Two Neighbor Cracks in a Copper Strip under Cyclic Tensile Loadings[J]. 2009, 43(2): 121-124. DOI：

摘要

对铜长条薄板在疲劳载荷下2条相邻裂纹的聚合进行了详细的试验研究.按照经典的断裂力学分析

最初预计初始的疲劳裂纹应该在2条相邻裂纹之间产生

并且导致2条相邻裂纹聚合为一个复杂的新缺陷.但是试验发现:在某些情况下初始的疲劳裂纹扩展产生在远离2条相邻裂纹之间区域的裂纹外尖端上

即不是发生在2条相邻裂纹的内尖端上.只有当这个外裂尖在疲劳载荷下自相似扩展一定长度并止裂一段时间后

2条相邻裂纹之间的内部区域才产生第二条曲线裂纹

该曲线裂纹的扩展才引起聚合的发生

而在第二条裂纹扩展期间

第一条扩展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 into the coalescence between two neighborly located cracks in a long copper strip under cyclic tensile loadings. Unlike expected

under some conditions the initial fatigue crack growth was found not to nucleate in the center region between the two cracks

where the stress concentration is much stronger than that in other positions and the stress intensity factor is much larger than the others. The initial fatigue crack growth was always found at the crack tip located outside the center region. The coalescence between the two cracks always occurred far after the initial fatigue crack growth. This phenomenon cannot be explained by the classical theories.

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references

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