首页 | 本学科首页   官方微博 | 高级检索  
     检索      

裂纹尖端张开角准则的稳态裂纹扩展实验研究
引用本文:白国娟,张晓晶,徐武,汪海.裂纹尖端张开角准则的稳态裂纹扩展实验研究[J].实验力学,2012,27(4):454-462.
作者姓名:白国娟  张晓晶  徐武  汪海
作者单位:1. 上海交通大学航空航天学院,上海,200240
2. 上海交通大学船舶海洋与建筑工程学院,上海,200240
基金项目:上海交通大学研究生创新能力培养专项基金项目(基金号z-413-003和z-010-011)
摘    要:ASTM和ISO已发布获得低约束条件下断裂性能和裂纹稳态扩展阻力曲线的标准,标准中采用多种试验方法确定临界裂纹张开角度来表征板材的裂纹稳态扩展。本文采用准静态裂纹扩展试验方法,通过摄像技术测定裂纹尖端张开角(CTOA),验证标准对1mm厚度2024-T3铝合金板稳态裂纹扩展行为的有效性。研究了试样构型、裂纹尺寸和是否疲劳预制裂纹对裂纹稳态扩展过程中CTOA的影响。试验结果表明:裂纹扩展2mm后,距离裂纹尖端1mm处的CTOA趋于一个恒定值6°,这个值与试样构型和裂纹长度无关;同时,不预制疲劳裂纹对CTOA值和试样的最大剩余强度影响较小。

关 键 词:薄壁结构  裂纹尖端张开角  裂纹稳态扩展  剩余强度  阻力曲线KR

Experimental Analysis of Stable Crack Extension based on Crack Tip Opening Angle Criterion
BAI Guo-juan , ZHANG Xiao-jing , XU Wu , WANG Hai.Experimental Analysis of Stable Crack Extension based on Crack Tip Opening Angle Criterion[J].Journal of Experimental Mechanics,2012,27(4):454-462.
Authors:BAI Guo-juan  ZHANG Xiao-jing  XU Wu  WANG Hai
Institution:School of Aeronautics and Astronautics, Shanghai Jiao Tong University, Shanghai 200240, China;School of Aeronautics and Astronautics, Shanghai Jiao Tong University, Shanghai 200240, China;School of Naval Architecture, Ocean and Civil Engineering, Shanghai Jiao Tong University, Shanghai 200240, China;School of Aeronautics and Astronautics, Shanghai Jiao Tong University, Shanghai 200240, China
Abstract:ASTM and ISO had published their fracture mechanics test standards on specimens with low constraint. Various methods had been used to determine the crack tip opening angle during stable crack extension to characterize the material fracture resistance. In this paper the ASTM standard is validated by studying the crack stable growth behavior of aluminum alloy sheet with 1mm thickness. The crack tip opening angle is measured by using optical microscopy method. Experimental results have shown that the crack tip opening angle is nearly a constant value of 6 degree after about 2mm of stable tearing. This value is independent on specimen geometry and initial crack length. It is also found that the constant crack tip opening angle and residual strength obtained from saw and fatigue cracked specimens are nearly the same.
Keywords:Thin wall structures  Crack tip opening angle  Stable crack growth  Residual strength  KR-curve
本文献已被 CNKI 万方数据 等数据库收录!
点击此处可从《实验力学》浏览原始摘要信息
点击此处可从《实验力学》下载免费的PDF全文
设为首页 | 免责声明 | 关于勤云 | 加入收藏

Copyright©北京勤云科技发展有限公司  京ICP备09084417号