Affiliation of Author(s):能源与动力学院

Journal:MODERN PHYSICS LETTERS B

Key Words:Digital image correlation heterogeneous deformation rigid rotation localized non-uniform intensity

Abstract:Heterogeneous deformation measurement using traditional digital image correlation (DIC) has times error of homogeneous deformation due to localized complexity. In case of small strain window, displacement field error will substantially corrupt the derived strain. On the contrary, large strain window will induce a reasonable information reduction in particular of heterogeneous deformation. In this paper, a novel parameter was put forward to correct displacement field and select strain subset size dynamically. This parameter was determined by localized displacement field that is called the localized displacement non-uniform intensity (lambda). In addition, there is a simple and effective method to eliminate the rigid body rotation impact on strain measurement. A series of speckle images containing different heterogeneous deformation are simulated finally. Results show that the accuracy on the displacement and strain field can be substantially improved especially in heterogeneous deformation fields.

ISSN No.:0217-9849

Translation or Not:no

Date of Publication:2017-07-30

Co-author:Liang, Zhonghan,Cheng, Baishun

Correspondence Author:s