| Abstract:
Due to high stress gradients in cracked components, a fine mesh is required at the crack region in finite element analysis. This, in practices, involves convergence problems and long run times in nonlinear elastoplastic analysis for determination of limit load of cracked components.
In this paper, with the aim finding the limit load of cracked components by linear elastic finite element analysis, a method based on elastic modulus reduction concept is studied and developed. Accordingly, limit loads for two sample models (DENP 1 & C (T) ^2) and a read component model (gas turbine cracked blade) are determined using the proposes method and the values are compared with those obtained from nonlinear finite element analysis. The result shows the capability, of this method in the limit load estimation of cracked components, and at the same time signifies the advantages of this method, such as using linear analysis (instead of nonlinear one), reduction of run time, with avoiding convergence problems. This method can be used as an efficient method for finding limit load and life assessment of real components based on fracture mechanics.
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