A Simulative Experiment for Characterizing the Strength of Functionally Gradient Material : The Analysis for the Case of Radial Crushing Test

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The effects of a gradient distribution of components on the deformation and fracture of functionally gradient materials (FGM) in the corundum/plaster model system were examined as a function of the volume fraction of corundum powder and the multiples of gravity. The radial crushing strength of the FGM was measured under the combined conditions for cast rings with three different volume fractions and three different multiples of gravity. The distribution patterns of stress and strain in FGM rings were analyzed by the conventional curved beam theory considering the change of elastic modulus. The brittle fracture was initiated from the inner surface of the ring on the load action line independent of the distribution of corundum powder. The variation of strength with the gradient distribution of corundum powder and with the centrifugal force was also studied.

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