Abstract:

Generally, sonic fatigue test at elevated temperatures is completed by using progressive wave tubes in combination with heating structures, and this method is time consuming and costly. Based on the principle of fatigue equivalence, a new method is presented which uses a shaker in combination with heating structures to obtain the sonic fatigue S N curve at elevated temperatures, and the problems involved in this method include specimen design, acoustic environment simulation, thermal environment simulation, reflector design, temperature control, sonic fatigue strain acquisition, temperature measurements, etc. The result of material GH140 using this method is presented, which indicates that this method is feasible and has the advantage of being economical of time and testing expenses.

Key words: S-N curve, shaker, sonic fatigue