Computer simulation of surface cracks behavior in anhydrous chemical conversion coatings on magnesium alloy

Home > Archive>Volume 47, Issue 2, 2018 >430-435

Computer simulation of surface cracks behavior in anhydrous chemical conversion coatings on magnesium alloy
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Affiliation:College of Computer Science and Technology,Harbin Engineering University,Institute of Surface/Interface Science and Technology,Key Laboratory of Superlight Material and Surface Technology of Ministry of Education,College of Material Science and Chemical Engineering,Harbin Engineering University,Institute of Surface/Interface Science and Technology,Key Laboratory of Superlight Material and Surface Technology of Ministry of Education,College of Material Science and Chemical Engineering,Harbin Engineering University,Institute of Surface/Interface Science and Technology,Key Laboratory of Superlight Material and Surface Technology of Ministry of Education,College of Material Science and Chemical Engineering,Harbin Engineering University,Institute of Surface/Interface Science and Technology,Key Laboratory of Superlight Material and Surface Technology of Ministry of Education,College of Material Science and Chemical Engineering,Harbin Engineering University,Institute of Surface/Interface Science and Technology,Key Laboratory of Superlight Material and Surface Technology of Ministry of Education,College of Material Science and Chemical Engineering,Harbin Engineering University
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Fund Project:National Natural Science Foundation of China

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Abstract:

In the conversion coatings, some uniformly distributed micro surface cracks always occur but the surface cracks behavior is rarely studied due to the frequent initiation in the real test conditions. In this work, computer simulation of micro surface cracks behavior and internal stresses generated in the anhydrous chemical conversion coating was carried out using the finite element method with the help of ABAQUS software. The Mises stress distribution, S11 stress variation, and the stress-time curves are obtained. The results show that the internal stresses generated in the conversion coating increased obviously with increasing time, and the stresses at the center and boundary of coating pieces are bigger than the ones in other areas while the S11 stresses around the center are bigger than the ones near the boundary. The cracks at the interface of coating pieces developed gradually and were as V-type cracks finally. The width of crack mouth opened was different since the contraction degree of each coating piece is different.

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[Li Lijie, Fang Yongchao, CaiZhaobing, Cui Xiufang, Liu Erbao, Jin Guo. Computer simulation of surface cracks behavior in anhydrous chemical conversion coatings on magnesium alloy[J]. Rare Metal Materials and Engineering,2018,47(2):430~435.]
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Received:August 07,2017
Revised:September 03,2017
Adopted:September 12,2017
Online: March 15,2018
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