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Öğe Effect of a temperature cycle on a rotating elastic-plastic shaft(Springer Wien, 2008) Arslan, E.; Mack, W.; Eraslan, A. N.The stress distribution in a rotating solid shaft with temperature dependent yield stress subject to a temperature cycle is investigated. It is presumed that the shaft is in a state of generalized plane strain and obeys Tresca's yield criterion and the flow rule associated with it. Even in an initially purely elastic shaft two plastic regions with different forms of the yield condition may emerge simultaneously at the centre. However, the expansion of the plastic zone ceases soon thereafter, and an unloaded region spreads into the plastic core; the latter process is treated in an approximate way. It is shown that the stress distribution is altered significantly by the temperature cycle, hence also leading to non-zero residual stresses at stand-still.Öğe Elastic limits of a radially heated thick-walled cylindrically curved panel(Springer Heidelberg, 2013) Arslan, E.; Mack, W.; Gamer, U.In analogy to the theory of wide curved beams, the basic equations for a cylindrically curved panel of homogeneous thickness in a state of plane strain subject to a radial temperature gradient are derived. The ends of this thick-walled shell are presupposed to be guided in such a way that a displacement in circumferential direction may occur and that the radius of the initial middle surface remains unchanged. Then, couples act on those ends, giving rise to pure bending conditions. Based thereon, the stresses occurring for a heated inner and/or outer surface are analyzed, and-taking thermal softening and hence a reduced yield stress into account-the elastic limits according to the yield criteria of Tresca and von Mises are discussed comprehensively.Öğe Elastic-plastic states of a radially heated thick-walled cylindrically curved panel(Springer Heidelberg, 2014) Arslan, E.; Mack, W.A cylindrically curved panel in a state of plane strain subject to a radial temperature gradient is investigated. The ends of this thick-walled shell are presupposed to be guided in such a way that a displacement in circumferential direction may occur and that the radius of the initial middle surface remains unchanged. Then, couples act on those ends, giving rise to pure bending conditions. For a material obeying Tresca's yield criterion and the flow rule associated with it, elastic-plastic states occurring for a heated inner and/or outer surface are studied in detail. Moreover, the residual stresses after cooling are discussed.Öğe Mechanical and electrical fields of piezoelectric curved sensors(Polish Acad Sciences Inst Fundamental Technological Research, 2014) Arslan, E.; Usta, R.BASED ON THE THEORY OF ELASTICITY, a comprehensive mathematical model is' developed for a piezoelectric bimorph curved bar which is in a closed electrical circuit. First, the model is verified by considering an actuator under an initial electric potential, and the numerical results are compared with those of a related study in the literature. Then, the model is used to obtain the mechanical and electrical fields of a bimorph curved sensor subjected to a couple at its free end section. Hence, the bending that causes the generation of electric potential in the sensor is investigated. The influence of the applied couple on the mechanical and electrical fields in the curved sensor is examined, and the results are presented in graphical form.
