Finite element method (FEM) is one of the most famous methods which has many applications in varies studies such as the study of crack propagation in engineering structures. However, unless extremely fine meshes are employed, problem arises in accurately modelling the singular stress field in the singular element area around the crack tip. In the present study, the crack growth simulation has b...

We consider the Poisson equation ?u = f with homogeneous Dirichlet boundary condition on a two-dimensional polygonal domain with cracks. Multigrid methods for the computation of singular solutions and stress intensity factors using piecewise linear functions are analyzed. The convergence rate for the stress intensity factors is

in this paper, the experimental method of caustics and its application to stress field and related studies in fracture mechanics is described. theocaris [1,2,3] has used the optical method of caustics to study stress intensity factors and the stress field around crack tips, in cracked transparent plates. many other researchers have also used this method to obtain stress intensity factors for di...

In this paper, extensive three-dimensional finite element analysis is conducted to study an asymmetric four-point shear (AFPS) specimen: a widely used mixed-mode I/II fracture test specimen. Complete solutions of mechanics parameters KI, KII, KIII, T11, and T33 have been obtained for wide range a/W t/W geometry combinations. It demonstrated that the thickness specimen has significant effect on ...

It is generally accepted that the fatigue crack growth (FCG) depends mainly on the stress intensity factor range (DK) and the maximum stress intensity factor (Kmax). The two parameters are usually combined into one expression called often as the driving force and many various driving forces have been proposed up to date. The driving force can be successful as long as the stress intensity factor...

Atomic Force Microscope images of a crack intersecting the free surface of a glass specimen are taken at different stages of subcritical propagation. From the analysis of image pairs, it is shown that a novel Integrated Digital Image Correlation technique allows to measure stress intensity factors in a quantitative fashion. Image sizes as small as 200 nm can be exploited and the surface displac...