Laboratory study of interaction between a circular hole defect and mode I moving crack

YANG Ren-shu; XU Peng; YUE Zhong-wen; CHEN Cheng

doi:10.16285/j.rsm.2016.06.009

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Laboratory study of interaction between a circular hole defect and mode I moving crack

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- Laboratory study of interaction between a circular hole defect and mode I moving crack
- Vol. 37, Issue 6, Pages: 1597-1602(2016)
- 作者机构：
  
  1. 中国矿业大学（北京）力学与建筑工程学院,北京,100083
  2. 中国矿业大学（北京）深部岩土力学与地下工程国家重点试验室,北京,100083
- 作者简介：
- 基金信息：
- DOI：10.16285/j.rsm.2016.06.009
  CLC： O346.1
- Online First：09 June 2018，
  
  Published：2016
- 稿件说明：
移动端阅览
YANG Ren-shu, XU Peng, YUE Zhong-wen, et al. Laboratory study of interaction between a circular hole defect and mode I moving crack[J]. 2016, 37(6): 1597-1602.
DOI：

YANG Ren-shu, XU Peng, YUE Zhong-wen, et al. Laboratory study of interaction between a circular hole defect and mode I moving crack[J]. 2016, 37(6): 1597-1602. DOI： 10.16285/j.rsm.2016.06.009.

摘要

为了研究运动裂纹与圆形孔缺陷的相互作用机制，采用数字激光动态焦散线方法进行了含圆形孔缺陷的冲击试验。结果表明：在冲击载荷下，I型运动裂纹在与圆形孔贯通前，断裂面光滑，扩展路径平直；运动裂纹从圆形孔上端起裂后，断裂面凹凸不平，扩展路径也更为弯曲。当运动裂纹朝向邻近的圆形孔扩展时，圆形孔对运动裂纹的扩展速度和动态应力强度因子有抑制作用，且随着圆形孔直径的增大，这种抑制作用不断增强。当运动裂纹与圆形孔缺陷汇聚后，圆形孔阻碍了裂纹的继续扩展，裂纹尖端被钝化，钝裂纹的起裂韧度较尖裂纹提高9.58%～13.87%，裂纹再次起裂时的扩展速度和动态应力强度因子存在明显的跳跃，表明钝裂纹更难起裂，需要消耗的能量更多。

Abstract

Using the digital-laser dynamic caustic system

the impact tests are utilized to investigate the interaction mechanism between a circular hole defect and mode I moving crack. The result shows that

under impact loading

the fracture face is relatively smooth and the growth path is straight towards the hole before the coalescence of moving crack and the round hole. After the moving crack initiates at the top of the round hole

the fracture face is relatively bumpy and the growth path is relatively bent. When the mode I moving crack propagates towards the adjacent round hole

the round hole plays a suppressive effect on crack growth velocity and dynamic stress intensity factor of moving crack. The suppressive effect becomes apparent with the increase of round hole diameter. After the crack-hole coalescence

the moving crack is arrested abruptly and the crack tip becomes blunt. The initiation toughness of the blunt crack increases about 9.58%-13.87% than that of the tip fracture. The crack growth velocity and dynamic stress intensity factor of the blunt crack show obvious jump when the crack initiates again at the hole

indicating that the more energy consumption is needed for blunt crack initiation.

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