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材料导报  2022, Vol. 36 Issue (10): 20100259-6    https://doi.org/10.11896/cldb.20100259
  金属与金属基复合材料 |
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
孙昊飞1, 肖志1,*, 韦凯1, 杨旭静1, 齐军2
1 湖南大学汽车车身设计及制造国家重点实验室,长沙 410082
2 上海汇众汽车制造有限公司,上海 201814
Experimental Study and Numerical Simulation on the Effect of Pre-bending Deformation on Fatigue Performance of Complex Phase Steel CP800
SUN Haofei1, XIAO Zhi1,*, WEI Kai1, YANG Xujing1, QI jun2
1 State Key Laboratory of Advanced Design and Manufacturing for Vehicle Body, Hunan University, Changsha 410082, China
2 Shanghai Huizhong Automobile Manufacturing Co., Ltd., Shanghai 201814, China
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摘要 由复相钢CP800制造的汽车底盘结构件如扭力梁,其成形过程中产生的预弯曲变形对其疲劳寿命具有重要影响。然而预弯曲变形对CP800钢疲劳性能影响的相关研究尚未见报道,因此本工作通过冲压对复相钢CP800施加了预弯曲应变,并揭示了预弯曲应变对CP800复相钢疲劳性能的影响。研究发现,预弯曲明显缩短了CP800钢的疲劳寿命,且该效果随平均应力的减小更加显著。在相同应力条件下,CP800钢预弯曲后的总应变幅值范围低于原板料,表明CP800钢经过预弯曲后,其抵抗宏观循环变形的能力有所提高,这与在单调变形中残余应力所导致的变形抗力降低不同。最后,基于Basquin理论建立了无预弯曲及预弯曲试样的S-N曲线,并结合ABAQUS/Fe-safe软件验证了基于S-N曲线的疲劳寿命预测模型的准确性。本工作为复相钢在工业应用中的构件服役寿命设计和预测提供了研究基础。
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孙昊飞
肖志
韦凯
杨旭静
齐军
关键词:  复相钢  预弯曲  S-N曲线  疲劳行为    
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
发布日期:  2022-05-24
ZTFLH:  U467.4+97  
基金资助: 国家自然科学基金(51875188)
通讯作者:  hnuxiao@163.com   
作者简介:  孙昊飞,2020年7月毕业于湖南大学汽车车身先进设计与制造国家重点实验室,获得学术型硕士学位,主要从事预变形对疲劳性能的影响、聚合物结晶动力学等研究。
肖志,湖南大学副教授。2007年10月毕业于湖南大学,获得博士学位。同年加入湖南大学汽车车身先进设计与制造国家重点实验室工作至今,主要从事汽车碰撞安全技术、人体生物力学虚拟建模、人体损伤防护结构设计、车内乘员约束系统的研究。在国内外重要期刊发表文章10余篇,主持多项科研项目。
引用本文:    
孙昊飞, 肖志, 韦凯, 杨旭静, 齐军. 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[J]. 材料导报, 2022, 36(10): 20100259-6.
SUN Haofei, XIAO Zhi, WEI Kai, YANG Xujing, QI jun. Experimental Study and Numerical Simulation on the Effect of Pre-bending Deformation on Fatigue Performance of Complex Phase Steel CP800. Materials Reports, 2022, 36(10): 20100259-6.
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http://www.mater-rep.com/CN/10.11896/cldb.20100259  或          http://www.mater-rep.com/CN/Y2022/V36/I10/20100259
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