Transactions of Materials and Heat Treatment

Title：Dent resistance of sheet metal for automobile panel

Authors： Zhang Junping Fang Gang Zhou Jia Zhou Zhansong Niu Liqiang

Unit： China Automotive Engineering Research Institute Co. Ltd.

KeyWords： dent resistance one-time loading initial stiffness unstable dent load sheet metal

ClassificationCode：TG386.1

year,vol(issue):pagenumber：2024,49(11):23-29

Abstract：

For three commonly used steel sheets and aluminium alloy sheets for automobile panels, according to the characteristics of actual service conditions, the dent resistances of materials were evaluated by one-time loading method. The research results indicate that the deformation of material under one-time loading condition exhibits three typical stages, such as linear elastic deformation, unstable dent and non-linearity deformation, and the thickness, material properties, pre-deformation and heat treatment all affect the dent resistance of material. It is beneficial for the initial stiffness improvement to increase the thickness, use steel sheet with higher elastic modulus and control the deformation amount, and the unstable dent load can be enhanced by increasing the thickness and selecting materials with higher yield strength and significant baking hardening properties. The influence laws of four key factors, namely, mechanical properties of material, sheet thickness, deformation degree and heat treatment state, on the dent resistance are obtained, which provides the reference for material selection and dent resistance control.

Funds：

国家重点研发计划资助项目（2016YFB0300805）

作者简介：张钧萍（1988-），男，硕士，高级工程师 E-mail：zhangjunping@caeri.com.cn

Reference：

[1]Sriram S, Speer J G, Matlock D K. Material and Design Factors Influencing the Quasi-static Dent Resistance of Steel Body Panels[R]. Detroit, Michigan: SAE Technical Paper，1999.

[2]Ekstrand G, Asnafi N. On testing of the stiffness and the dent resistance of autobody panels[J]. Materials & Design, 1998, 19(4): 145-156.

[3]Holmberg S, Thilderkvist P.Influence of material properties and stamping conditions on the stiffness and static dent resistance of automotive panels[J].Materials & Design, 2002, 23(8):681-691.

[4]Thomas D. Numerical Prediction of Panel Dent Resistance Incorpo-rating Panel Forming Strains[D].Canada： University of Waterloo, 2001.

[5]Daniel D, Hoffmann J L, Plassart G, et al. Optimization of 6016 Aluminum Alloy Selection for Outer Panels[R]. Paris, France：SAE Technical Paper, 2002.

[6]张龙柱,王连轩,李晓广,等.汽车覆盖件用钢板的抗凹性能研究[J].热加工工艺, 2022,51(7):40-43,47. Zhang L Z, Wang L X, Li X G, et al. Research on dent resistance of steel sheets for automotive outer panel[J]. Hot Working Technology, 2022,51(7):40-43,47.

[7]张钧萍,马鸣图,方刚,等.铝合金板材抗凹性能研究[J].中国工程科学, 2014, 16(1): 108-112.

Zhang J P, Ma M T, Fang G, et al. Research on dent resistance property of aluminum alloy sheets[J]. Strategic Study of CAE, 2014, 16(1): 108-112.

[8]李东升,周贤宾,吕晓东,等.汽车板抗凹性评价体系及试验机系统[J].北京航空航天大学学报, 2003(5):467-470.

Li D S, Zhou X B, Lyu X D, et al. Evaluation system and testing machine system for automotive panel dent resistance[J]. Journal of Beijing University of Aeronautics and Astronautics, 2003 (5): 467-470.

[9]Shih H C, Horvath C D. Effects of material bending and hardening on static dent resistance[A].SAE 2003 World Congress & Eshibition[C]. Detroit, Michigan, 2003.

[10]Holmberg S, Nejabat B. Numerical assessment of stiffness and dent properties of automotive exterior panels[J]. Materials & Design, 2004, 25(5): 361-368.

[11]姚贵升. 采用烘烤硬化钢板(BH钢)改善汽车车身外表零件的抗凹陷性能[J]. 宝钢技术,2000（4）: 1-7,19.

Yao G S. Improvement in the dent-resistance of autobody panel by using BH steel sheet[J]. Baosteel Technology，2000（4）: 1-7,19.

[12]朱晓东, 程国平, 俞宁峰. 各向同性钢与烘烤硬化钢的烘烤硬化性和抗凹陷性[J]. 钢铁研究学报, 2006, 18(11): 43-46.

Zhu X D, Cheng G P, Yu N F. Bake hardenability and dent resistance of isotropic steel and BH steel[J]. Journal of Iron and Steel Research, 2006, 18(11): 43-46.

[13]DiCello J A, George R A. Design criteria for the dent resistance of auto body panels[J]. SAE Transactions, 1974: 389-397.

[14]SAE J2575—2004, Performance based standard for accelerated exposure of automotive exterior materials using a controlled irradiance xenon-arc apparatus[S].

[15]Shen H Q, Chen G L. Numerical analysis of panels′ dent resistance considering the Bauschinger effect[J].Materials & Design, 2010, 31(2):870-876.

[16]SAE J2575—2015, Standardized dent resistance test procedure[S].

[17]GB/T 228.1—2021, 金属材料拉伸试验第1部分：室温试验方法[S].

GB/T 228.1—2021,Metallic materials—Tensile testing—Part 1: Method of test at room temperature[S].

Service：

【This site has not yet opened Download Service】【Add Favorite】