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A cohesive zone
finite element approach to model tensile cracks in thin film
coatings
Srikant Nekkanty, Mark E. Walter and Rajiv Shivpuri |
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Vol. 2 (2007), No. 7, 1231–1247
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Abstract |
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A two-dimensional finite element model using cohesive zone elements was developed to predict cracking in thin film coating-interlayer-substrate systems that are subjected to tensile loading. The constitutive models were chosen to represent a metal carbide/diamond-like carbon composite coating with a titanium interlayer and a steel substrate. Material properties of the coating and interlayer along with the cohesive finite element parameters were varied to study effects on stress distributions and coating cracking. Stress distributions were highly nonuniform through the coating thickness. Thus the initiation and arrest of tensile cracks differed from what is predicted by simple shear-lay theory. Intercrack spacing distributions resulting from the variation of different parameters were quantified and compared with those from experiments. |
Keywords
thin film coatings, cohesive zone finite element modeling,
tensile cracking, intercrack spacing
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Milestones
Received: 24 July 2006
Accepted: 20 February 2007
Published: 1 September 2007
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Authors |
| Srikant Nekkanty | |
| Department of Industrial, Welding
and Systems Engineering Ohio State University Columbus, OH 43210 United States |
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| Mark E. Walter | |
| Department of Mechanical
Engineering, E331 Scott Laboratory Ohio State University 201 W. 19th Avenue Columbus, OH 43210 United States |
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| Rajiv Shivpuri | |
| Department of Industrial, Welding
and Systems Engineering Ohio State University Columbus, OH 43210 United States |
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