الفهرس 
Chapter one: IntroductionOnly 14 pages are availabe for public view
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Abstract
The crack growth in metallic materials using fast and reliable simulations of 2-D and linear elastic finite element models is investigated. The effect of the stress intensity factor in mode I and II (KI, KII) on the fracture behavior of stainless steel and the associated strain energy density factor in mixed mode crack propagation was studied numerically to determine crack propagation angle θ in linear elastic fracture investigation. In order to implement the determination of the crack propagation direction using the strain energy density criterion S, the numerical finite element program ANSYS was used. ANSYS APDL macros were developed to generate the geometry, material properties, boundary conditions and mesh size of the model for the conducted analyses. To demonstrate the capability of crack propagation trajectories using the proposed method under mixed mode situation, an edge crack specimen was considered with initial crack having the same length but at different inclination angles under a uniaxial tension load. Results obtained from the developed models had a good agreement (average deviation of 4.63%) with the results available in the literatures and Confrontation with experimental data shows reasonably accurate prediction of crack trajectories with U-notches subjected to mixed mode loading.The Aim of the thesis• The main purpose of this thesis is to verify the results obtained from the analysis by means of FEM techniques• Apply the experimental investigation along with FEM techniques in order to predict the expected crack direction using Strain energy density criterion. • The developed finite element models will be verified and then used to predict the crack propagation trajectories.