A method for measuring temperature-dependent stress and thermal expansion of coatings

✍ Scribed by Chin -Chen Chiu

• Publisher: Springer
• Year: 1993
• Tongue: English
• Weight: 839 KB
• Volume: 28
• Category: Article
• ISSN: 0022-2461
• DOI: 10.1007/bf00365166

✦ Synopsis

Equations and a strain-gauge technique have been presented previously for the determination of the residual stresses in ceramic coatings. In the current work, the equations are rewritten in terms of simple form. The technique is extended to elevated-temperature environments. The stress-temperature relations of coated systems are modelled according to elastic and thermoviscoelastic theory. In addition, residual stress and thermal expansion coefficient measurements are performed on SiC coating-graphite substrate composites.

* Stress relaxation may be achieved by the evolution of trapped gas, recrystallization of metastable phases, plastic deformation, viscous flow, etc. The viscous flow-induced stress relaxation is discussed in Appendix B.