Application of Physically Based Creep Damage Equations to Life-Time Predictions of Kirchhoff- and V. Kármán Plates

Abstract

The mechanical behaviour of thin-walled structures operating at elevated temperatures is strongly influenced by irreversible time dependent deformations. Creep strains may be cause a significant stress redistribution in a structure leading to creep buckling even by moderate loading, Kraus (1980). Another kind of premature failure is connected with material deterioration processes such as intergranular cavitation in interaction with ageing phenomena corresponding to a microstructural instability of alloys, Lemaitre and Chaboche (1990). Both, the deformation and damage, are depending on the stress levels, the stress states as well as the history of loading, which take place in thin-walled structures at operating conditions, Penny and Marriott (1995).