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This work presents a new formulation of the Boundary Element Method (BEM) for nonlinear time-dependent problems. An incremental process, in order to reach the steady state condition and the secondary steady stage for visco-plasticity and creep respectively, has also been developed. This research includes the development of a new Boundary Element Formulation for analysis of fracture problems related to visco-plasticity and creep. For the visco-plastic and creep crack analysis the Dual Boundary Element Method, (DBEM) is formulated. The implementation of visco-plasticity and creep in the...