Journal of Jilin University(Engineering and Technology Edition) ›› 2019, Vol. 49 ›› Issue (3): 829-835.doi: 10.13229/j.cnki.jdxbgxb20180419

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Scratch resistance of aluminum automotive coatings based on continuum damage mechanics

Wei⁃min ZHUANG1(),Peng⁃yue WANG1,Dong⁃xuan XIE2,Yan⁃hong CHEN3   

  1. 1. State Key Laboratory of Automotive Simulation and Control, Jilin University, Changchun 130022, China
    2. FAW?Volkswagen Automotive Co. , Ltd. , Changchun 130011, China
    3. Department of Aeronautics，Imperial College，London SW7 2AZ 1, England
  • Received:2018-05-02 Online:2019-05-01 Published:2019-07-12

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Abstract:

Continuum Damage Mechanics (CDM) was introduced into the finite element analysis of scratch resistance of coatings. Firstly, a damage mechanics based on the material model was created. Secondly, this material model was implemented into ABAQUS solver through user defined subroutine VUMAT. Finally, a series of analyses were carried out to analyze the mechanical behavior of coatings. The material model could be used not only to capture the stress distribution of coatings, but also to predict the damage evolution of coatings under scratch loading. In addition, it is found that the loading speed and coating thickness have certain effects on scratch resistance, but the properties and thickness of substrate have little effect on it. The theoretical support was provided for the optimal design of the coating material.

Key words: surface coating material, continuum damage mechanics(CDM), user?defined material subroutine, scratch resistance of coating

CLC Number: 

  • TQ630.7

Table 1

Fitting material parameters"

材料参数AA5052AA6061?T6UL800实色漆涂层
密度/(g·cm－1)2.72.71.5
E/MPa85710701601821
υ0.280.280.32
n13.4282.2
K/MPa33.373016.5
k/MPa85.4426510
A18.3168
B/MPa169.45150.3055
C0.270.72.8
m1.5611.2
n213.07.59

Fig.1

Fitting curves of AA5052 and AA6061?T6"

Fig.2

Fitting curve of coating UL800"

Fig.3

Flow chart of VUMAT"

Fig.4

Schematic representation of coating model"

Fig.5

Stress distribution under different scratching distance"

Fig.6

Damage distribution and failure morphology under different scratch distance"

Fig.7

Scratch curves"

Fig.8

SEM image of automobile coating"

Fig.9

Relationship between coating reaction and penetration depth"

Fig.10

Relationship between scratch resistance of coating and loading speed"

Fig.11

Relationship between scratch resistance of coating and substrate material"

Fig.12

Relationship between scratch resistance and the thickness of coating and substrate"

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