Thermal stresses at high temperatures in stainless-steel rings by the moiré method

The research presented in this paper is a continuation of previous work published by one of the authors. Improvements in the techniques of recording and processing moiré data in thermal-strain fields have extended the maximum temperature at which useful information can be obtained from 400 to 1600° F. It has been found that the strains obtained experimentally do not depart very much from the values predicted by the theory of elasticity, although the stresses at some points of the model exceed the yield limit at the corresponding temperature. These results prove that the moiré method can be used with advantage to obtain experimental information in an area where experimental data are scarce if not nonexistent.