Lifetime assessment and ratcheting behavior of pressurized pipe

Abstract

Pipe equipment widely are used in power plants. Many studies have been devoted to lifetime assessmentof pipeusing different approaches. In the present paper pipe under internal pressure and cyclic bending is studied (bending may be induced by heat). Chaboche's kinematic hardening model is used to simulate tube response in plastic zone. At the plastic zone microscopic defects in the material are developed into macroscopic defects and tube this leads to pipe fracture. This phenomenais simulated with continuum damage mechanics. Evolution of whole-life ratcheting behavior and fatigue damage of pipe are discussed.