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Crack propagation and deviation in bi-materials under thermo-mechanical loading
Chama, Mourad,Boutabout, Benali,Lousdad, Abdelkader,Bensmain, Wafa,Bouiadjra, Bel Abbes Bachir Techno-Press 2014 Structural Engineering and Mechanics, An Int'l Jou Vol.50 No.4
This paper presents a finite element based numerical model to solve two dimensional bi-material problems. A bi-material beam consisting of two phase materials ceramic and metal is modelled by finite element method. The beam is subjected simultaneously to mechanical and thermal loadings. The main objective of this study is the analysis of crack deviation located in the brittle material near the interface. The effect of temperature gradient, the residual stresses and applied loads on crack initiation, propagation and deviation are examined and highlighted.
Crack propagation and deviation in bi-materials under thermo-mechanical loading
Mourad Chama,Benali Boutabout,Abdelkader Lousdad,Wafa Bensmain,Bel Abbes Bachir Bouiadjra 국제구조공학회 2014 Structural Engineering and Mechanics, An Int'l Jou Vol.50 No.4
This paper presents a finite element based numerical model to solve two dimensional bi-material problems. A bi-material beam consisting of two phase materials ceramic and metal is modelled by finite element method. The beam is subjected simultaneously to mechanical and thermal loadings. The mainobjective of this study is the analysis of crack deviation located in the brittle material near the interface. The effect of temperature gradient, the residual stresses and applied loads on crack initiation, propagation and deviation are examined and highlighted.
Berriah Abdelatif,Megueni Abdelkader,Lousdad Abdelkader 국제구조공학회 2016 Structural Engineering and Mechanics, An Int'l Jou Vol.60 No.6
Components manufactured from composite materials are frequently subjected to superimposed mechanical and thermal loadings during their operating service. Both types of loadings may cause fracture and failure of composite structures. When composite cross-ply laminates of type [0m / 90n]s are subjected to uni-axial tensile loading, different types of damage are set-up and developed such as matrix cracking: transverse and longitudinal cracks, delamination between disoriented layers and broken fibers. The development of these modes of damage can be detrimental for the stiffness of the laminates. From the experimental point of view, transverse cracking is known as the first mode of damage. In this regard, the objective of the present paper is to investigate the effect of transverse cracking in cross-ply laminate under thermo-mechanical degradation. A Finite Element (FE) simulation of damage evolution in composite crossply laminates of type [0m / 90n]s subjected to uni-axial tensile loading is carried out. The effect of transverse cracking on the cross-ply laminate strength under thermo-mechanical degradation is investigated numerically. The results obtained by prediction of the numerical model developed in this investigation demonstrate the influence of the transverse cracking on the bearing capacity and resistance to damage as well as its effects on the variation of the mechanical properties such as Young’s modulus, Poisson’s ratio and coefficient of thermal expansion. The results obtained are in good agreement with those predicted by the Shear-lag analytical model as well as with the obtained experimental results available in the literature.