Multiscale crack-tip displacement field measurements by two digital image correlation methods
Characterizing a crack-tip displacement field of a growing crack is important in identifying the actual fracture mode mixing and in evaluating the associated fracture toughness of a material.Experimentally,the conventional forward digital image correlation (DIC) method has been used to measure the crack-tip opening displacement (CTOD) and crack-tip opening angle (CTOA) of a stationary crack and to measure the displacement field some distance away from the tip of a stationary crack for estimating the stress intensity factor.In this paper,we compare two DIC methods for measuring the near crack-tip displacement field at meso- and micro-scales by digital microscopy.The two methods called the extended DIC method and the adaptive backward DIC method respectively are used to extract local displacement field vectors around a crack-tip.
crack propagation CTOD CTOA stress intensity factor fracture mode
Wei Tong Lin Wang
Southern Methodist University,Mechanical Engineering Department,Dallas,Texas,USA
国际会议
北京
英文
1-1
2013-06-16（万方平台首次上网日期，不代表论文的发表时间）