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A CFD-DEM-Wear Coupling Method for Stone Chip Resistance of automotive coatings with a Rigid Connection ParticleMethod for Non-Spherical Particles

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Computer Modeling in Engineering & Sciences 2022年第11期133卷 251-280页

作者： Jiacheng Qian Chenqi Zou Mengyan Zang Shunhua Chen Makoto Tsubokura School of Mechanical&automotive Engineering South China University of TechnologyGuangzhou510641China School of Marine Engineering and Technology Sun Yat-sen UniversityZhuhai510275China Southern Marine Science and Engineering Guangdong Laboratory(Zhuhai) Zhuhai528315China RIKEN Center for Computational Science Kobe650-0047Japan

The stone chip resistance performance of automotive coatings has attracted increasing attention in academic and industrial *** though traditional gravelometer tests can be used to evaluate stone chip resistance of automotive coatings,such experiment-based methods suffer from poor repeatability and high *** main purpose of this work is to develop a CFD-DEM-wear coupling method to accurately and efficiently simulate stone chipbehaviorof automotive coatings inagravelometer *** this end,an approach coupling an unresolved computational fluid dynamics(CFD)method and a discrete element method(DEM)are employed to account for interactions between fluids and large *** order to accurately describe large particles,a rigid connection particle method is *** doing so,each actual non-spherical particle can be approximately described by rigidly connecting a group of non-overlapping spheres,and particle-fluid interactions are simulated based on each component *** erosion wear model is used to calculate the impact damage of coatings based on particlecoating *** spherical particle tests are performed to demonstrate the feasibility of the proposed rigid connection particle method under various air pressure ***,the developed CFD-DEM-wear model is applied to reproduce the stone chip behavior of two standard tests,i.e.,DIN 55996-1 and SAE-J400-2002 *** results are found to be in good agreement with experimental data,which demonstrates the capacity of our developed method in stone chip resistance ***,parametric studies are conducted to numerically investigate the influences of initial velocity and test panel orientation on impact damage of automotive coatings.

关键词： automotive coating stone chip resistance gravelometer non-spherical particle composite particle CFD-DEM

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Evolution of appearance profile of hot-dip galvanized car-body steel sheet during deformation process

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Baosteel Technical Research 2017年第2期11卷 30-36页

作者： ZHAO Yanliang SHI Jinzhong DAI Yigang Research Institute Baoshan Iron & Steel Co.Ltd. R & D Center of Great Wall Motor Company Automotive Engineering Technical Center of Hebei

In recent years, the waterborne free intermediate coating process has been widely used in the automotive industry. Because the baking times and coating thickness are decreased, the surface covering capability of the painting process is reduced, which directly affects the appearance quality（ long-and short-wave values） of the body paint. Thus, there are correspondingly higher requirements for the white body surface profile prior to painting. The surface profile of the white body is mainly affected by the plate material, the surface profile, and the deformation process. So,the change rule for the surface profile during deformation of the steel plate is a key factor in coating appearance optimization. In this paper, we first analyze the typical deformation of the outer cover of a car body. Then ,we examine the change tendency of the surface profile of steel plates with respect to different deformation rates, specifically for a steel plate comprising a hot-dip galvanized bake-hardened steel sheet. Based on our analysis of the influence of the deformation on the coating appearance,we selected 3% ,5% ,and 8% deformation rates in this research. We found the roughness （Ra） value in the typical deformation range （3% -8% ） of the car body to exhibit a decreasing trend at first and then an increasing trend. The Ra value of the 8% deformation is not more than the original plate test value. When the Pc value of the original plate is in the lower range （ about 60）, it exhibits a slight increasing trend in the deformation process （3 % -8 % ）. And when the Pc value of the original plate is in the higher range （ about 120 ）, it exhibits no increasing trend in the deformation process （ 3% -8% ）. In contrast,the waviness （WCA） value in the car body＇s typical deformation range （3%-8%） shows a significant growth trend.

关键词： automotive coating hot-dip galvanized steel sheet bake hardened steel deformation roughness waviness

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