An application of a phenomenological theory of creep damage

The presentation summarizes a creep damage theory based on a simple phenomenological model of creep and creep damage making it possible to evaluate creep stress to rupture relationship. Four material constants, which can be evaluated from uniaxial creep test results, are used to describe the material behaviour. The theory is validated by comparison with an Al-alloy and a steel experimental data, and a temperature relationship of the material constants is presented. Experimental creep to rupture data of steel tubes loaded with internal pressure are compared with the theoretical curves derived from the uniaxial creep data.