On the Reduction of Stress Concentration Factor Around a Notch Using a Functionally Graded Layer

Gouasmi, S.; Megueni, A.; Bouchikhi, Aboubakar Seddik; Zouggar, Kamel

doi:10.1590/1516-1439.025115

Cited by 18 publications

(6 citation statements)

References 11 publications

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“…The variation of the FGM properties in the direction of notch radius (r-FGM) offers the best favorable choice compared to other directions, as it has been mentioned in our previous investigation [30].…”

Section: Resultsmentioning

confidence: 99%

3D Numerical Analysis of Cracked Ti-TiB FGM Plate with a Semicircular Notch Subjected to Different Modes Load Conditions

Bouchikhi

Bouida

Boukhoulda

2019

Period. Polytech. Mech. Eng.

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This study has been made to determine the performance of the (Ti-TiB) FGM plate to reduce the J-integral calculated for the crack tip emanating from the semicircular notch root in mode I and mixed mode, when the crack is propagated from the notch root. In this paper, 3D finite element method is applied to analyze the behavior of a crack emanating from semicircular notch root growing from the metal (Ti) and is oriented perpendicularly in direction of ceramic (TiB). The J-integral has been found for several combinations laws of FGM plates with respect to the variable combination of the crack length, the plate thickness, the notch radius, Young modulus of FGM plate constituents and the crack orientation. These parameters must be optimized in order to improve the best performances.

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Section: Resultsmentioning

confidence: 99%

3D Numerical Analysis of Cracked Ti-TiB FGM Plate with a Semicircular Notch Subjected to Different Modes Load Conditions

Bouchikhi

Bouida

Boukhoulda

2019

Period. Polytech. Mech. Eng.

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“…A detailed introduction and computation can be found in Kubair [21,22]. In this paper, the classical definition for SCF, which is still widely adopted in FGMs [6,7,24,42,43] is used for further analysis and discussion, i.e., here the SCF is expressed as τ max θ3 /τ ∞ 23 . The variation in SCF with exponent n for different shaped holes is shown in Figure 13.…”

Section: Optimized Analysismentioning

confidence: 99%

“…The continuous variation in the microstructure of FGMs can well mitigate the mismatch of material properties at the interface, which can effectively decrease the stress concentration as compared to the existing material interfaces [5]. The fast development of FGMs has been able to reduce the stress concentration near various shaped holes [6][7][8]. In the past decade, many works have analyzed the problems of stress concentration around a hole in FGMs [9][10][11][12].…”

Section: Introductionmentioning

confidence: 99%

Stress Concentration and Optimized Analysis of an Arbitrarily Shaped Hole with a Graded Layer under Anti-Plane Shear

Guan

2018

Applied Sciences

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This paper provides a general solution to the anti-plane problem of an arbitrarily shaped hole reinforced with a functionally graded (FG) layer in a homogenous plate. By using the piece-wise homogeneous layers method and the conformal mapping technique, the complex potentials in the form of series in the FG layer are derived based on the theory of complex variable functions. The influence of the FG layer on the shear stress distributions around some typically shaped holes are discussed by numerical examples, and then the optimized analysis of the stress concentration factor (SCF) is performed. The results showed that the SCF of various shaped holes can be noticeably reduced by the optimum design of the material variations in the layer, and the most significant one in this paper is the triangular hole, whose SCF can be decreased by more than 50%.

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“…To reduce the stress concentration factor, Sburlati [28] studied the effect of an inhomogeneous annular made of FGM on the stress distribution around a hole in a homogeneous plate. Aiming to reduce the stress concentration factor around the notch, Gouasmi, et al [29] used the finite element method to study the performance of the FGM layer near the notch of the ceramic plate. Sburlati, et al [30] analyzed the effect of FGM layers on the stress concentration factor in a homogeneous plate with holes based on the finite element method.…”

Section: Introductionmentioning

confidence: 99%

Stress Concentration and Damage Factor Due to Central Elliptical Hole in Functionally Graded Panels Subjected to Uniform Tensile Traction

et al. 2019

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Functionally graded material (FGM) can optimize the mechanical properties of composites by designing the spatial variation of material properties. In this paper, the stress distribution of functionally graded panel with a central elliptical hole under uniaxial tensile load is analyzed. Based on the inhomogeneity variation and three different gradient directions, the effects of the inhomogeneity on the stress concentration factor and damage factor are discussed. The study results show that when Young’s modulus increases with the distance from the hole, the stress concentration factor decreases compared with that of homogeneous material, and the optimal design of r-FGM is better than that of x-FGM and y-FGM when the tensile load. In addition, when the associated variation of ultimate stress is considered, the choice of scheme to reduce the failure index is related to the strength-modulus exponent ratio. When the strength-modulus exponent ratio is small, the failure index changes with the index of power-law, which means there is an optimal FGM design. But when the strength-modulus exponent ratio is large, the optimal design modulus design is to select a uniform material that maximizes the modulus at each point. These research results have a certain reference value for further in-depth understanding of the inhomogeneous design for FGM.

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On the Reduction of Stress Concentration Factor Around a Notch Using a Functionally Graded Layer

Cited by 18 publications

References 11 publications

3D Numerical Analysis of Cracked Ti-TiB FGM Plate with a Semicircular Notch Subjected to Different Modes Load Conditions

3D Numerical Analysis of Cracked Ti-TiB FGM Plate with a Semicircular Notch Subjected to Different Modes Load Conditions

Stress Concentration and Optimized Analysis of an Arbitrarily Shaped Hole with a Graded Layer under Anti-Plane Shear

Stress Concentration and Damage Factor Due to Central Elliptical Hole in Functionally Graded Panels Subjected to Uniform Tensile Traction

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