Abstract
An extensive accurate finite element (FE) analysis of the impression creep test was performed for two material systems, i.e. a single phase half infinite system and a coating/substrate system. For each case, the FE analysis was carried out for different classes of punch sizes aimed to develop methods to separate creep properties of a coating from a coating/substrate system. The study emphasis was placed on understanding how the punch size influenced the impression creep exponent of a certain coating/substrate system. A weight expression was proposed to quantify the coating's and the substrate's contributions to the impression creep exponent of the coating/substrate system. The results of finite element analysis show that the value of the weight expression exhibits a good power-law dependence on the radius of the punch for a certain coating/substrate system. The weight function proposed allows developing an analytic approach to separate coating's creep exponent from a coating/substrate system. Then a numerical approach including procedures of fitting the curve of n vs R/Tc and extrapolating to R=0 was put forward to determine the coating's creep exponent. Both of the results obtained by the two methods agree reasonably well with the input FE model.
| Original language | English |
|---|---|
| Pages (from-to) | 1829-1834 |
| Number of pages | 6 |
| Journal | Xiyou Jinshu Cailiao Yu Gongcheng/Rare Metal Materials and Engineering |
| Volume | 39 |
| Issue number | 10 |
| State | Published - Oct 2010 |
Keywords
- Coating/substrate system
- Creep parameters
- Finite element analysis
- Impression creep
- Weight function