预弯曲变形对复相钢CP800疲劳性能影响的实验研究及数值仿真计算

doi:10.11896/cldb.20100259

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Abstract Automobile structural parts made by complex phase steel CP800, such as torsion beam, will suffer pre-bending deformation during the process of manufacture, which affects fatigue properties. However, related studies for the effect of pre-bending on fatigue property of CP800 have not been reported. Therefore, in this work, pre-bending strain was applied to the CP800 by stamping, and the effect of pre-bending on the fatigue behavior of CP800 was studied. Pre-bending has a negative effect on the fatigue life of CP800, and the effect is more obvious with decreasing mean stress. Under the same stress condition, the range of total strain amplitude of pre-bending specimens is lower than that of as-received sample. It means that after pre-bending deformation, its resistance to macroscopic cyclic deformation was improved, which is different to the phenomenon that the resistance decreased due to the residual stress during monotonous deformation. Finally, S-N formulas of as-received and pre-bending specimens were established based on Basquin equation, and the accuracy of the fatigue life prediction model based on S-N curve is verified by software ABAQUS/Fe-safe. In general, this work provides a research basis for the design and prediction of service life of structural parts in industrial applications.

Key words： complex phase steel pre-bending S-N curve fatigue behavior

Published: Online: 2022-05-24

CLC number:

U467.4+97

Fund:National Natural Science Foundation of China (51875188).

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	Articles by authors
	SUN Haofei
	XIAO Zhi
	WEI Kai
	YANG Xujing
	QI jun

Cite this article:

SUN Haofei,XIAO Zhi,WEI Kai, et al. Experimental Study and Numerical Simulation on the Effect of Pre-bending Deformation on Fatigue Performance of Complex Phase Steel CP800[J]. Materials Reports, 2022, 36(10): 20100259-6.

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http://www.mater-rep.com/EN/10.11896/cldb.20100259 OR http://www.mater-rep.com/EN/Y2022/V36/I10/20100259

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