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| Effect of the coating thickness on the bond strength for brittle coating-substrate system |
| Received:September 23, 2014 Revised:December 26, 2014 |
| View Full Text View/Add Comment Download reader |
| DOI：10.7511/jslx201601016 |
| KeyWord:brittle coating thickness of coating bond strength 3D model |
| Author | Institution |
| 卞达 |
江南大学 机械工程学院, 无锡 |
| 王永光 |
苏州大学 机械工程学院, 苏州 |
| 倪自丰 |
江南大学 机械工程学院, 无锡 |
| 赵永武 |
江南大学 机械工程学院, 无锡 |
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| Abstract: |
| With finite element method (FEM), the relationships of the bond strength with the thickness and the number of the brittle coating has been widely studied in 2-D model.Compared to these in 3-D model, the stress and strain in the width direction are ignored in 2-D model.It is necessary to investigate the effect of the thickness and the number of the coating on the bond strength for the brittle coating/substrate in 3-D model.A 3-D model was built and the results of the FEM and the Hertz analytical method were compared to verify the accuracy of the FEM model.This paper discussed the relationship between the thickness of coating and the maximum shear stress of the coating/substrate.It was found: firstly, with the increase in the thickness, the minimum of shear stresses happened in coating/substrate decreased and the maximum of shear stresses happened at the top of coating decreased firstly and then increased.The minimum of the maximum of shear stresses was achieved at 0.4 mm.Secondly, with the increase in the thickness, the suddenly changed stress of coating/substrate along the Z axis decreased, while the suddenly changed stress in coating along the Z axis increased.However the position of the suddenly changed stress in coating along the Z axis was transformed to the external surface of the coating.Finally, the increase in the thickness of coating contributed to the decrement of the stress along the X axis. |
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