Finite Element Calculation of Residual Thermal Stresses for Functionally Graded Hydroxyapatite-Titanium Plate Design

Abstract

Abstract:Functionally graded materials (FGMs) have varying graded composition along their thickness as the result of a gradual transition of the properties belongs to the different composed materials. Whenever these two dissimilar materials are combined together, the residual stress caused certainly by the difference of coefficient of thermal expansion will leads to decohesion/delamination of the structures. This study aims to analyze the residual thermal stress for the design of functionally graded Hydroxyapatite-Titanium plate as a solution to the sharp interfaces. Finite element method (FEM) has been implemented for the parametric study to see the correlation between some parameters and the performance of the FGM structure. The results show that P = 1, t = ±0.8 mm and N ≥ 5 are the optimized and the best values for the compositional distribution exponent, thickness of the graded layers and the layer number, respectively. The calculated residual thermal stress values were verified through the comparison with the established results reported previously. In conclusion, the FEM is proved applicable for the design and evaluation of elastic residual thermal stress of an FGM structure.

Effect of Sintering Temperature on Functionally Graded Nickel/Alumina Plate

“…The residual stresses distribution in Ni/Al 2 O 3 FGM were computed using finite element method (FEM) by taking into account some measured CTE values to predict the position of cracks [6]. The residual thermal stress calculation also can be utilized for the optimization of the FGM layers [7]. Generally, the maximum principal stress theory which used in the ceramic material is applied to acknowledge the failure of FGMs [8].…”