Main Article Content
Creep and creep-corrosion, which are the most important degradation mechanisms in structures such as piping used in the nuclear, chemical and petroleum industries, in this paper have been studied maximum no of creep equation as well as identified, and further classified into two simple groups of power law and exponential models. Then, a probabilistic model has been developed and compared with the mostly used and acceptable models from phenomenological and statistical points of view. This model is based on a power law approach for the primary creep part and a combination of power law and exponential approach for the secondary and tertiary part of the creep curve. This model captures the whole creep curve appropriately, with only two major parameters, represented by probability density functions. Moreover, the stress and temperature dependencies of the model will be calculated. Based on the Bayesian inference, the uncertainties of its parameters have been estimated by Win-BUGS program. Linear temperature and stress dependency of exponent parameters are presented for the first time.