In-depth numerical analysis of crack initiation and evolution in coating–substrate systems under spherical indentation
Source abstract
Abstract
Indentation tests have been extensively utilized to evaluate coating–substrate systems. However, only cracks on the surface of the coating after unloading can be observed experimentally, which may cause inaccurate evaluation of the failure of the system. In this work, a finite element model (FEM) of a thin elastic coating (Al2O3) firmly attached to an elastic–plastic substrate (WC–Co) was built, which was compressed by spherical indenters with radii of 1.5 and 0.2 mm. It was found that there is a significant difference in the critical loads required for the generation of ring and radial cracks between the loading and unloading stages, and the failure evaluation of coating–substrate systems using an indentation test with optical observation is not precise, particularly for radial cracks. The interfacial delamination was also studied simultaneously. Additionally, these results were compared with experimental data and reproduced by extended finite element model (XFEM).Graphical abstract
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Research context
OpenAlex topics: Metal and Thin Film Mechanics · Numerical methods in engineering · Advanced Surface Polishing Techniques
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References (40)
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