2110 シャットダウン時の薄肉円筒の過渡的熱応力を低減する流体温度履歴の逆問題的決定(J02-3 逆問題解析手法の開発と最新応用(3),J02 逆問題解析手法の開発と最新応用)

Abstract

In this paper an inverse method is proposed for determining the optimum thermal load history of a thin pipe which reduces transient thermal stress under shutdown considering the multidisciplinary physics. The multidisciplinary complex problem was decomposed into a heat conduction problem, heat transfer problem, and thermal stress problem. An analytical solution of the temperature distribution of the radial thickness and the thermal hoop stress distribution was obtained. The maximum inner hoop tensile stress was minimized for the case where inner surface temperature T_s(t) was expressed in terms of the 3rd order polynomial function of time t. Finally, from the temperature distributions, the optimum fluid temperature history was obtained for reducing the transient thermal tensile stress.