期刊
OPTICS AND LASERS IN ENGINEERING
卷 65, 期 -, 页码 81-88出版社
ELSEVIER SCI LTD
DOI: 10.1016/j.optlaseng.2014.06.013
关键词
Digital image correlation; Stress-strain curves; Plastic zone; Low carbon steel; Uniaxial tension
类别
资金
- National Natural Science Foundation of China (NSFC) [11132003, 11272089]
- Priority Academic Program Development of Jiangsu Higher Education Institutions (PAPD)
Three-dimensional digital image correlation has been utilized widely in many fields due to its advantages of non-contact, full-field measurement and simplicity. Based on 3D-DIC measurement system and electronic universal testing machine, two uniaxial tension tests for low carbon steel specimen were performed to acquire the true stress-strain curves. An assumption was made that specimen's cross section keeps as a circle in tension test whose diameter could be determined by calculation of the curvature of surface shape. Therefore, true stress of specific cross section was acquired and hence the true stress-strain curves were obtained. In addition, the evolution of plastic zone of specimen under uniaxial tension was studied as well. And experimental results indicate that at certain time instant of expanding process of plastic zone, region that has already entered the plastic zone and that has not entered such zone yet is keeping in a constant deformed state, while region that is entering the plastic zone provides axial plastic deformation, which is almost equal to crosshead movement of testing machine. (C) 2014 Published by Elsevier Ltd.
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