As functionally graded material (FGM) plates are widely used in engineering and industrial fields, the fracture strength evaluation of cracked FGM plate becomes increasingly important. However, due to gradation mechanical properties FGM, few analytical methods simple available. In this paper, a convenient method for under different loadings is proposed terms stress intensity factor (SIF) appear...

Shear testing is one of the most complex testing areas where available methods and specimen geometries are different from each other. Therefore, a modified shear test specimen (MSTS) combining the simple uniaxial test with a zone of interest (ZOI) is tested which gives almost the pure shear. In this study, material parameters of polypropylene (PP) and high density polyethylene (HDPE) are first ...

Fatigue cracks commonly occur for in-service engineering structures. The main parameter fatigue crack is the stress intensity factor (SIF). SIF an indicator of growth and remaining life a structure. Nonetheless, problem was raised when determining since could not be presented in physical phenomena. Thus, technique required to predict range SIF. Maximum minimum bounds help estimate life. This pa...

Residual stresses are usually associated with induced by heterogeneous deformations as a cause of phase transition and thermal stress. The residual can appear during the manufacturing process, repair or in some cases due to operational loads. These should be taken into account structural integrity evaluation low-toughness materials case fatigue and/or stress corrosion cracking (SCC) situations....

the problem of several finite moving cracks in a functionally graded material is solved by dislocation technique under the condition of anti-plane deformation. by using the fourier transform the stress fields are obtained for a functionallygraded strip containing a screw dislocation. the stress components reveal the familiar cauchy singularity at thelocation of dislocation. the solution is empl...

Abstract Failure starts with creation of a crack, then the propagation crack and eventually fracture material. Furthermore, material selection, geometry, processing residual stresses are critical factors that may contribute to uncertainty prospective failure mechanisms in engineering. These issues also arise computational analysis, problematic model, for instance, three-dimensional surface nece...

This paper presents a new method for continuum based shape sensitivity analysis for a crack in a homogeneous , isotropic, and linear-elastic body subject to mixed-mode (modes I and II) loading conditions. The method is based on the material derivative concept of continuum mechanics, domain integral representation of an interaction integral, and direct differentiation. Unlike virtual crack exten...

This study has used the strain energy density (SED) approach to evaluate stress intensity factor (SIF) of cracked cruciform welded joints in Hardox 450 steel. A microstructural analysis was made steel which is composed refined and tempered low carbon martensite. The obtained results simulation will be compared with those provided by J-integral methode for different enriched zones contours based...

Under low confinement axial compression, the failure of brittle rock is mainly caused by tensile fracture. Many scholars adopt sliding crack as an idealized model to present intrinsic mechanism but due complex configuration crack, its stress intensity factor (SIF) calculation has always been a difficult problem. In this study, improved proposed; in context linear elastic fracture mechanics (LEF...

In order to investigate the properties of Y-shaped cracks of brittle materials under compression, compression tests by using square cement mortar specimens with Y-shaped crack were conducted. A true triaxial loading device was applied in the tests, and the major principle stresses or the critical stresses were measured. The results show that as the branch angle θ between the branch crack and th...