A model for time dependent strain accumulation and damage at low temperatures in Ti-6Al-4V

This paper introduces a method for predicting cold creep in Ti-6Al-4V by attempting to quantify time dependent deformation and rupture caused by the formation of quasi-cleavage facets observed in this titanium alloy. A logarithmic creep method has been used to describe low temperature creep curves. However this method fails to predict the curve shape at higher stresses. An additional term is used to quantify creep rates at all conditions. A finite element model has been developed, based on this method, which accurately predicts stress relaxation at ambient temperature and quantifies time dependent failure in a notched specimen under cyclic loading.