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Effect of material composition on bending analysis of FG plates via a two-variable refined hyperbolic theory

100%

Bouazza M. , Zenkour A. M. , Benseddiq N.

Archives of Mechanics

2018

tom Vol. 70, nr 2

107--129

The major novelty of the article is an application of a two-variable refined hyperbolic shear deformation theory based on studying the bending behavior of functionally graded material (FGM) plates with simply-supported edges. The influence of variating material characteristics and volume fraction of the constituent on bending behavior of the FG plate is examined. The advantage of this theory over other contributions is that a number of functional variables is reduced. All presented problems that have been solved previously, but have not studied the effect on changing plate characteristics, material composition are reinvented.

FE model for linear-elastic mixed mode loading: estimation of SIFs and crack propagation

100%

Boulenouar A. , Benseddiq N. , Mazari M. , Benamara N.

Journal of Theoretical and Applied Mechanics

2014

tom Vol. 52 nr 2

373--383

Finite element analysis combined with the concepts of linear elastic fracture mechanics provides a practical and convenient means to study the fracture and crack growth of materials. The onset criterion of crack propagation is based on the stress intensity factor, which is the most important parameter that must be accurately estimated and facilitated by the singular element. The displacement extrapolation technique is employed to obtain the SIFs at crack tip. In this paper, two different crack growth criteria and the respective crack paths prediction for several test cases are compared between the circumferential stress criterion and the strain energy density criterion. Several examples are presented to compare each criterion and to show the robustness of the numerical schemes.

A strain energy density theory for mixed mode crack propagation in rubber-like materials

88%

Boulenouar A. , Benseddiq N. , Merzoug M. , Benamara N. , Mazari M.

Journal of Theoretical and Applied Mechanics

2016

tom Vol. 54 nr 4

1417--1431

In this paper, a numerical modeling of crack propagation for rubber-like materials is presented. This technique aims at simulating the crack growth under mixed-mode loading based on the strain energy density approach. At each crack increment length, the kinking angle is evaluated as a function of the minimum strain energy density (MSED) around the crack tip, using the Ansys Parametric Design Language (APDL). In this work, numerical examples are illustrated to demonstrate the effectiveness, robustness and accuracy of the computational algorithm to predict the crack propagation path. The results obtained show that the plan of crack propagation is perpendicular to the direction of the maximum principal stretch. Moreover, in the framework of linear elastic fracture mechanics (LEFM), the minimum values of the density are reached at the points corresponding to the crack propagation direction.

The fretting fatigue of the bolted assemblies

75%

Benhamena A. , Aminallah L. , Aid A. , Benguediab M. , Amrouche A. , Benseddiq N.

Zeszyty Naukowe. Mechanika / Politechnika Opolska

2011

tom z. 99

17-17

One of the principal failures of bolting assemblies is the fretting. The combi- nation of vibration and service load can introduce the damage of fretting fatigue on the contact surfaces of the assembly which trend to evoke a nucleation of crack and then the structure fracture. Contact pressure or clamping force and displacement at the interface or relative slip are two important factors which control the fretting wear and the fretting fatigue. This paper describes the effect of clamping force (tightening torque) on the fretting fatigue behavior of bolted assemblies.