A model for compressive coating stresses in the scratch adhesion test
| Autor: | Yongsong Xie, H.M Hawthorne |
|---|---|
| Rok vydání: | 2001 |
| Předmět: |
Materials science
Modulus Surfaces and Interfaces General Chemistry Substrate (electronics) Adhesion engineering.material Condensed Matter Physics Paint adhesion testing Surfaces Coatings and Films Stress (mechanics) Compressive strength Coating Scratch Materials Chemistry engineering Composite material computer computer.programming_language |
| Zdroj: | Surface and Coatings Technology. 141:15-25 |
| ISSN: | 0257-8972 |
| DOI: | 10.1016/s0257-8972(01)01130-6 |
| Popis: | Despite the widespread use of the scratch adhesion test, there is no model available to determine the critical coating stress for initiating interfacial failure, so that ranking the coating–substrate adhesion of coated systems with different mechanical properties is impossible. In this study, a mathematical model is developed to calculate the distribution of compressive stresses in a thin coating induced by a scratch indenter. For ease of use in practice, a simple equation, σ Sm =0.15 ( P c H f / H ) 0.5 E f 0.3 E 0.2 / R , is then derived from the model, where σ Sm is the critical mean compressive stress in the coating for interfacial failure, P c is the critical normal load measured from the scratch adhesion test, H f and E f are the hardness and Young's modulus of the coating, H and E are the hardness and Young's modulus of the substrate, and R is the indenter radius. This equation is useful for ranking the coating–substrate adhesion of different coated systems, or, for estimating the critical mean coating stress for interfacial failure. |
| Databáze: | OpenAIRE |
| Externí odkaz: |
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