Author(s)

E. Bellenger & P. Coorevits

Abstract

Computational modelling for rapid creep life assessment and post-critical behaviour E. Bellenger & P. Coorevits LMCAO, Universite de Picardie, lUTde VAisne, France Abstract In this paper a macroscopic modelling of creep behaviour is proposed. Back- stress models within unified formulation are used for numerical simulations of primary and secondary creep periods, associated with a scalar damage variable and nonlinear geometrical effects for tertiary creep description. These models have been implemented in finite element code. We will de- scribe different modes of damage development and we will verify the very different early crack growth behaviour exhibited by different structures. For the numerical treatment, we propose to use the LATIN method in a version adapted to solve problems with geometrical nonlinearities. This method describes primary and secondary creep periods in a few large time incre- ments to reach swiftly the tertiary creep period. If creep life assessm

Keywords