Study of Fracture Mechanics Assessments in Industrial Applications

摘要

Fracture mechanics has been widely used for mechanical integrity assessment in industrial applications.Different approaches in the fracture mechanics assessment have been developed to achieve more accurate prediction of component lifetime.This paper describes fracture mechanics assessments by applying the 2D and 3D crack growth analyses of a real mechanical component under cyclic load as an example from the power industry.In 2D crack growth analysis,both an appropriate equivalent geometry as well as the original geometry with an explicit crack model are investigated.A limitation of 2D crack growth analysis in the example is to consider load redistribution,which follows from the local stiffness change attributed to the cyclic crack growth.This can be overcome by 3D crack growth analysis with an explicit crack model.Comparison between 2D and 3D assessment results are given.The concept of local limit load and failure assessment diagram (FAD) are reviewed and studied by using finite element (FE) analysis.