Spherical indentation of compositionally graded materials: Theory and experiments

被引:158
作者
Suresh, S
Giannakopoulos, AE
Alcala, J
机构
[1] Dept. of Mat. Sci. and Engineering, Massachusetts Inst. of Technology, Cambridge
关键词
D O I
10.1016/S1359-6454(96)00291-1
中图分类号
T [工业技术];
学科分类号
08 ;
摘要
Computational and experimental results on the evolution of stresses and deformation fields due to indentation from a rigid spherical indenter on a graded substrate are presented. The analyses address the variations in Young's modulus, E, of the substrate as a function of depth, z, beneath the indented surface for an exponential law, E = E(0)e(alpha z) where E(0) is Young's modulus at the surface and 1/alpha. is a length parameter. The finite element simulations are used to check the analytical theory of Giannakopoulos and Suresh [Int. J. Solids Struct. (in press)] and are used to gain Further insights into the effects of the variation in Poisson ratio, v, with depth. The theoretically predicted force-indenter penetration (P-h) curves are also compared with direct experimental measurements made on compositionally graded Ni-Al2O3 and TiAl-Y2O3-stabilized TZP composites of known composition gradients. A new method is proposed for the estimation of Young's modulus variations through a compositionally graded layer by recourse to spherical indentation. (C) 1997 Acta Metallurgica Inc.
引用
收藏
页码:1307 / 1321
页数:15
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