Modeling of Stresses in Coated Solids
Abstract
A finite element approach to model stress distributions in coated solids is developed. The personal computer based PC-ANSYS code is used to implement the approach on a personal computer system. The three types of boundary loading considered are an elliptical normal pressure distribution, a shear stress distribution proportional to the normal pressure, and a thermal flux proportional to the surface shear. The model predictions are validated against the classical Hertz theory and plane strain solution obtained independently by well established Fourier transform approaches. The deviations of the finite element model from the other available solutions is found to be less than 1%. Parametric results of the model establish practical significance of the modeling approach for optimization of coating thickness, materials selection, and for the development of coating application techniques and procedures to ensure acceptable 'break-away' stresses in the coating and at the coating/substrate interface. Extension of the finite element approach to the modeling of complex three dimensional contacts is demonstrated by modeling a rectangular contact over a semi-infinite solid. This preliminary three-dimensional model, along with the two-dimensional parametric results demonstrate technical feasibility of the overall modeling approach. In addition, the results provide a strong analytical foundation for the development of a more rigorous and sophisticated models, and wide range of practical applications. (js)
Document Details
- Document Type
- Technical Report
- Publication Date
- Aug 06, 1990
- Accession Number
- ADA227709
Entities
People
- J. A. Walowit
- Pradeep K. Gupta