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Abstract：
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In the actual forming process, sheet metal often experiences a complex strain path, and the change of the strain path has a great influence on the mechanical behavior of TRIP steel. Then, the influences of pre-strain and strain path change on tensile strength and fracture elongation of TRIP steel were studied by the method of two-step uniaxial tension, and the strain of necking area and its surrounding area were measured by DIC method to further analyze the influence of strain path change on fracture elongation. The results show that the influences of in-plane anisotropy on tensile strength and fracture elongation of TRIP steel are not obvious, and pre-strain and strain path change almost have no effect on the tensile strength of TRIP steel. However, the fracture elongation of TRIP steel increases when pre-strain exists, and in a certain pre-strain range, the larger the pre-strain is, the greater fracture elongation increases. With the increase of second loading angle, the fracture elongation gradually decreases on the whole. DIC measurements show that strain distribution becomes more uniform in TRIP steel by increasing the pre-strain, but strain distribution becomes more concentrated with increasing the angle of second loading.
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Funds：
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广东省自然科学基金资助项目（2016A030313453，2016A 030313519）
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AuthorIntro：
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作者简介：张迎（1993-），男，硕士研究生
E-mail：1461833752@qq.com
通讯作者：周驰（1973-），男，博士，副教授
E-mail：mechzhou@scut.edu.cn
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Reference：
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