The growth of slant cracks by fretting fatigue of a half plane in contact with a flat rounded pad was studied. The mode I and mode II stress intensity factors for cracks of various lengths and directions were calculated using the semi-analytical method of the distribution of dislocations, and their cumulative effect on the crack growth was investigated using the strain energy density criterion....

This paper describes the testing of laser deep penetration processing on controlled fragmentation high carbon steel (50SiMnVB). The objective this research is to make use defects in zones and optimize quality prefabricated cracks. shows that a deeper central crack appear zone when heat input 60 J/mm, appeared affected by martensite microstructure, microhardness magnitude tensile stress. Further...

This paper is directed towards :nite element computation of fracture parameters in functionally graded material (FGM) assemblages of arbitrary geometry with stationary cracks. Graded :nite elements are developed where the elastic moduli are smooth functions of spatial co-ordinates which are integrated into the element sti=ness matrix. In particular, stress intensity factors for mode I and mixed...

The rupture of the interface joining two materials under frictional contact controls their macroscopic sliding. Interface dynamics depend markedly on mechanical properties bulk that bound interface. When are similar, recent experimental and theoretical work has shown shear cracks described by Linear Elastic Fracture Mechanics (LEFM) quantitatively describe interfaces. elastic dissimilar, many n...

The Green's function and the boundary element method for analysing fracture behaviour of cracks in piezoelectric half-plane are presented in this paper. By combining Stroh formalism and the concept of perturbation, a general thermoelectroelastic solution for half-plane solid subjected to point heat source and/or temperature discontinuity has been derived. Using the proposed solution and the pot...

This paper presents numerical analysis of stress intensity factors (SIFs) of inclined cracks due to mechanical mismatches. According to literature survey, tremendous amounts of SIFs can be found elsewhere. However, the SIFs for inclined cracks are difficult to obtain especially when mechanical mismatch at the crack interface are considered. ANSYS finite element program is used to model the crac...

modelling of crack propagation by finite element method under mixed mode conditions is of prime importance in fracture mechanics. this paper describes an application of finite element method to the analysis of mixed mode crack growth in linear elastic fracture mechanics. crack growth process is simulated by an incremental crack-extension analysis based on the maximum principal stress criterion,...

This paper presents a new continuum shape sensitivity method for calculating the mixed-mode stress-intensity factors of a stationary crack in two-dimensional, linear-elastic, orthotropic functionally graded materials with arbitrary geometry. The method involves the material derivative concept taken from continuum mechanics, the mutual potential energy release rate, and direct differentiation. S...

The interface crack of a slab track is fracture mixed-mode that experiences complex loading–unloading–reloading process. A reasonable simulation the interaction between layers tracks key to studying crack. However, existing models disease have problems, such as stress oscillation tip and self-repairing, which do not simulate mixed mode cracks accurately. Aiming at these shortcomings, we propose...

Analysis has been performed on fracture initiation near a crack in a brittle material with strength described by Weibull statistics. This nonlocal fracture model allows for a direct correlation between near crack-tip stresses and failure. Predictions are made for both the toughness and average fracture initiation angle of a crack under mixed-mode loading. This is pertinent for composites and is...