Aplicação de modelos de fratura elástica e de dano para a simulação numérica da influência do hidrogênio na propagação de trincas em aços de alta resistência.

Abstract

A consistent computational model based on Elastic Linear Fracture Mechanics and Continuous Damage Mechanics was implemented to simulate the problem of crack propagation under mechanical stress and the effect of degradation caused by hydrogen diffusion in the crystal structure of a ago high strength. In the implementation of the models for the calculation of the stress intensity factor in the hydrogenated material and in the simulation of crack growth and propagation, the Finite Element Method and the Runge-Kutta Method were used. fourth order respectively. The results obtained in the simulations confirmed the influence of the presence of hydrogen on the stress intensity factor variation when considering its effect on the elastic modulus of the material. Likewise, from the application of the damage model, it was observed the influence of the presence of hydrogen in the reduction of crack initiation and propagation time.