Abstract��According to the measurement method for the metal sheet and strip tensile strain hardening index�� the test and calculation were conducted�� and the high resolution Zwick test machine was used to process the stress and strain data. The two point method�� finite difference method and regression method were applied in the calculation. The[n]value measured in the prescribed scope ��10%-20%�� of the strain had high accuracy and reliability. For the measurement methods for[n]value�� the[n]value calculated by the interval regression method in the range of 10%-20% of the strain was close to that obtained by the Zwick test machine�� and the error was small. In the actual measurement�� 5 point fitting method can be used to calculate data�� and the error between the calculated data and[n10-20]was within 1%.
����Ϊ���º��Σ����Dz���������. ������������Ӧ��Ӳ��ָ������[J]. �й������ڿ���, 2017, 35(5): 40-43.
ZHANG You-wei��CHEN Hai-tao��LIU Zhi-bo��DONG Lian-chao��. Test of tensile strain hardening index of cold rolled sheet. Chinese Journal of Iron and Steel, 2017, 35(5): 40-43.
2017, Vol. 35 
