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

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...

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Bibliographic Details
Published in:Materials Vol. 12; no. 3; p. 422
Main Authors: Wang, Wenshuai, Yuan, Hongting, Li, Xing, Shi, Pengpeng
Format: Journal Article
Language:English
Published: Switzerland MDPI AG 30.01.2019
MDPI
Subjects:
Composite materials
Computer simulation
Finite element analysis
Finite element method
Functionally gradient materials
Image processing
Inclusions
Machining
Material properties
Mathematical analysis
Modulus of elasticity
Nonlinear programming
Parameters
Stress concentration
Surface properties
Technology assessment
functionally graded materials
finite element method
failure and damage
stress concentration factor
inhomogeneous composite materials
material design
elliptical hole
ISSN:1996-1944, 1996-1944
Online Access:Get full text
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Summary: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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ISSN:1996-1944
1996-1944
DOI:10.3390/ma12030422