ELASTIC-PLASTIC INVESTIGATION ON EFFECTIVENESS OF TWO DIMENSIONAL FUNCTIONALLY GRADED MATERIALS IN REDUCTION OF THERMAL STRESSES

2008 ◽  
Vol 36 (3) ◽  
pp. 689-710
Author(s):  
Nemat-Alla, M.M. ◽  
Ahmed K.I ◽  
Hassab-Allah, I. M.
Keyword(s):  
Functionally Graded Materials ◽  
Thermal Stresses ◽  
Functionally Graded ◽  
Two Dimensional ◽  
Graded Materials ◽  
Elastic Plastic

scholarly journals Elastic–plastic analysis of two-dimensional functionally graded materials under thermal loading

2009 ◽  
Vol 46 (14-15) ◽  
pp. 2774-2786 ◽  
Author(s):  
Mahmoud Nemat-Alla ◽  
Khaled I.E. Ahmed ◽  
Ibraheem Hassab-Allah
Keyword(s):  
Functionally Graded Materials ◽  
Thermal Loading ◽  
Functionally Graded ◽  
Two Dimensional ◽  
Graded Materials ◽  
Elastic Plastic ◽  
Plastic Analysis

Improved crack analysis of two-dimensional functionally graded materials by enriched natural element method

2020 ◽  
Vol 234 (10) ◽  
pp. 2012-2023
Author(s):  
Jin-Rae Cho
Keyword(s):  
Stress Intensity ◽  
Functionally Graded Materials ◽  
Displacement Field ◽  
Stress Intensity Factors ◽  
Functionally Graded ◽  
Two Dimensional ◽  
Intensity Factors ◽  
Graded Materials ◽  
Natural Element Method ◽  
Natural Element

The numerical calculation of stress intensity factors of two-dimensional functionally graded materials is introduced by an enriched Petrov–Galerkin natural element method (enriched PG-NEM). The overall trial displacement field is basically approximated in terms of Laplace interpolation functions and it is enriched by the near-tip asymptotic displacement field. The overall strain and stress fields which were approximated by PG-NEM were smoothened and enhanced by the patch recovery. The modified interaction integral [Formula: see text] is used to evaluate the stress intensity factors of functionally graded materials with the spatially varying elastic modulus. The validity of present method is justified through the evaluation of crack-tip stress distributions and the stress intensity factors of four numerical examples. It has been found that the proposed method effectively and successfully captures the near-tip stress singularity with a remarkably improved accuracy, even with the remarkably coarse grid, when compared with an extremely fine grid and the analytical and numerical reference solutions.

Fracture Mechanics of Functionally Graded Materials

MRS Bulletin ◽  
1995 ◽  
Vol 20 (1) ◽  
pp. 43-44 ◽  
Author(s):  
F. Erdogan
Keyword(s):  
Fracture Mechanics ◽  
Functionally Graded Materials ◽  
Bonding Strength ◽  
Thermal Stresses ◽  
Material Design ◽  
Thermomechanical Properties ◽  
Functionally Graded ◽  
Life Assessment ◽  
Inhomogeneous Materials ◽  
Graded Materials

In today's highly demanding technological environment, one of the main challenges in new material design is combining seemingly irreconcilable thermomechanical properties in the same component (e.g., high heat and corrosion resistance, high strength in elevated-temperature applications and high resistance to wear, and high toughness in load-bearing elements). In many cases, the problem may be solved by using coatings or by layering dissimilar materials. From a structural viewpoint, a major disadvantage of these techniques, particularly in ceramic coating of metals, has been the resulting high thermal and residual stresses and relatively poor bonding strength. Thus, in thin films, coatings, and layered materials, surface cracking and debonding or delamination have been common forms of mechanical failure. One effective way of reducing residual and thermal stresses and enhancing bonding strength has been to eliminate material-property discontinuities by grading the material composition near the interfaces or through the coating. These new materials, with continuously varying compositions or volume fractions, are known as functionally graded materials (FGMs).In developing FGMs, research on the mechanics, and particularly on the fracture mechanics of these inhomogeneous materials, is needed to provide technical support to materials scientists and to manufacturing and design engineers. In the past, fracture mechanics has been useful both as a screening tool during material processing and as a design and maintenance tool for service-life assessment. Broadly speaking, fracture mechanics involves studying the effect of the applied loads, the component/flaw geometry, and the environmental conditions on the fracture of engineering materials.

On the calibration of elastic-plastic models for metal-ceramic functionally graded materials

2008 ◽  
Author(s):  
Massimiliano Bocciarelli ◽  
Gabriella Bolzon ◽  
Giulio Maier ◽  
Glaucio H. Paulino ◽  
Marek-Jerzy Pindera ◽  
...  
Keyword(s):  
Functionally Graded Materials ◽  
Functionally Graded ◽  
Graded Materials ◽  
Elastic Plastic ◽  
Metal Ceramic
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