Measurement of the[n-value]and[r-value]of IF steel based on the digital image correlation method
ZOU Yu-ming1��GAO Yi-fei1��MA Ya-xin2
��1. National Analysis Center for Iron and Steel�� Central Iron and Steel Research Institute�� Beijing 100081�� China 2. Department of Aeronautical Manufacturing Engineering�� Chengdu Aeronautic Polytechnic�� Chengdu 610100�� China��
Abstract��The evaluation of the property of IF steel mostly depends on its[n-value]and[r-value��] and it is difficult to get the stable and accurate results because the mechanical extensometer which is widely used is severely affected by the experiment environment. To get the accurate[r-value]and research the factors which influence the measurement accuracy of [r-value]in the test�� the tensile test and digital image correlation �� DIC �� method are used to measure the[n-value]and [r-value]of IF steel and the experimental results are compared with the results which are got from the mechanical extensometer. In addition�� a series of virtual transverse extensometers are added at different locations of the sample by the DIC method to analyze the influence of the measuring positions of transverse strain on the measurement of[r-value.] The experimental results show that the stability of the DIC method is better than that of the mechanical extensometer. Different measuring positions of the virtual transverse extensometer lead to different experimental results�� and the farther the measuring position away from the fracture location�� the bigger the result error is. While�� the DIC method can ensure the accuracy of the measuring position and results.
�ո�����: 2016-12-15
��������: 2017-08-21
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E-mail: qiuqiu1759@qq.com
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������������쳣�������. ��������ͼ����ط�����IF��[n]ֵ��[r]ֵ����[J]. �й������ڿ���, 2017, 35(4): 27-32.
ZOU Yu-ming��GAO Yi-fei��MA Ya-xin. Measurement of the[n-value]and[r-value]of IF steel based on the digital image correlation method. Chinese Journal of Iron and Steel, 2017, 35(4): 27-32.
2017, Vol. 35 
