Creep fatigue test method and control apparatus for creep test apparatus

摘要

Accurately simulate the condition of the actual parts by creep fatigue test. The control device of the creep test device is a control to apply stress so as to follow the stress-time characteristic in the operation cycle of the actual machine so as to simulate the condition of the member on which the stress causing creep fatigue during operation of the actual machine acts By applying stress control to the specimen, strain control, which is a control to acquire the strain-time characteristics of the specimen and apply stress to the specimen so as to follow the change of strain in the strain-This operation cycle is repeated. As the stress-time characteristic, for example, one obtained by conducting a thermal stress analysis on a member is used. The above-mentioned strain control is performed in a period in which the stress is constant in at least the stress-time characteristic. The actual machine is, for example, a steam turbine, and the above-mentioned member is, for example, at least a part of a casing or a valve of a steam turbine.