Materials Science Forum, Vol.423-4, 693-697, 2003
Stress analysis in multilayered FGM plates under thermal shock
In this study, one-dimensional calculation was employed to evaluate the steady-state and transient temperature/stress distributions in a multilayered functionally graded ceramic-metal composite materials. The residual thermal stress raised from fabrication process because of the macroscopic variation of constituent across the thickness was also evaluated. The alumina/nickel FGM disks were fabricated using a powder stacking method and a pulse electric current sintering technique. The thermal shock tests on the fabricated FGM disks were performed and the stress distributions in the FGM plates under thermal shock were calculated using a critical temperature difference where cracks appeared on the ceramic surface. Then the thermal shock properties of FGM plates were evaluated under the consideration of both the thermal stress and the residual thermal stress distribution. It was indicated that the thermal shock properties of the multilayered alumina-nickel FGM plate were strongly influenced by the residual thermal stress distribution on the alumina surface.