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Thermal elastic-plastic stresses and strains have been obtained for rotating annular disk by using finite difference method with Von-Mises’ yield criterion and non-linear strain hardening measure. The compressibility of the disk is assumed to be varying in the radial direction. From the numerical results, we can conclude that thermal rotating disk made of functionally graded material whose thickness decreases exponentially and density increases exponentially with non-linear strain hardening measure (m = 0.2) is on the safe side of the design as compared to disk made of homogenous material. This is because of the reason that circumferential stress is less for functionally graded disk as compared to homogenous disk. Also, plastic strains are high for functionally graded disk as compared to homogenous disk. It means that disk made of functionally graded material reduces the possibility of fracture at the bore as compared to the disk made of homogeneous material which leads to the idea of stress saving.
PAPER REVISED: 2018-04-09
PAPER ACCEPTED: 2018-04-29
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THERMAL SCIENCE YEAR 2019, VOLUME 23, ISSUE Issue 1, PAGES [125 - 136]
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