管端の半径変位が拘束され内圧を受ける円管の光弾性応力解析

抄録

The round pipe partially prevented form radial displacement under internal pressure load, such as the pipe inserted into the tube plate, coupling and flange fitting, is investigated by means of three dimensional photoelasticity. The epoxy resin round pipe model, which is inserted into a circular thick plate, is heated up to the critical temperature in the stress freezing furnace and the internal pressure is maintained constant until the temperature of the inside of the furnace falls to the room temperature.
After stress freezing, the outer diameters of the models are measured and the circumferential stresses produced on the inner and outer surfaces of the models are evaluated by using the many slices obtained from the model. The relationship between the circumferential stresses and the form factors is summarized in the figures. It is shown that in the thin-walled round pipe the maximum outer diameter and the maximum circumferential stress on the outer surface of the round pipe arise on the cross section in the neighborhood of outlet from the thick circular plate. Moreover, the reason for the characteristic results obtained is considered qualitatively.