Abstract
Functionally gradient materials (FGM) with distributed propertied have attracted special interest as advanced heat-shielding/structural materials in future space applications. The objective of the present study is to evaluate the validity and/or usefulness of the solution of the temperature rise in FGM, the front surface of which is subjected to pulse- or stepwise heating. Applicability of the approximate solution has been investigated by comparing it with an exact analytical solution for the FGM in which distributed thermophysical properties have certain profiles. When the FGM is composed of conventional solid materials, the appropriateness of the approximate solution for the FGM has been shown, inasmuch as the temperature response near the rear surface is concerned. The approximate solution is also compared with the solution for the multilayered material. Because of its simplicity and fair degree of agreement, the approximate solution is anticipated to be used for not only qualitative but also quantitative prediction of the temperature rise near the rear surface of the FGM, from the engineering point of view.
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