熱応力のみを受ける円筒のラチェット変形挙動

概要

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An experimental study on the thermal ratcheting of a cylinder subjected to axially moving temperature distribution was performed in this paper in order to verify both the ratcheting mechanism and the predictive equations for the ratcheting strain which the authors had proposed. Hollow cylinders, which were made of SUS304 steel, were subjected to axisymmetric temperature distribution with the maximum temperature of 650℃. Three kinds of movement of this temperature distribution were considered, that is, stationary cycling without moving, hot-front cycling and cold-front cycling with opposite moving directions. As a result of the experiment, little ratcheting occurred in stationary cycling. On the contrary, remarkable ratcheting occurred in the cases of hot-and cold-front cycling. An expansion of the diameter of the cylinder was observed in the case of cold-front cycling, and a contraction was observed in the case of hot-front cycling. These phenomena coincided well with the prediction, and the validity of the proposed ratcheting mechanism was verified. Conservative prediction of the ratcheting strain by using the predictive equations was possible at the large number of cycles where the work hardening and/or the cyclic hardening was involved in the experiment.
一般社団法人日本機械学会の論文
1990-05-25