Recent development in thermoelastic stress analysis

Abstract

Thermoelastic stress analysis (TSA) is one of the methods in experimental mechanics used for qualitative and quantitative estimation of the stress. state on the surface of cyclically loaded structures which can be either models or actual structures in their operating environment. In this paper critical remarks are given on two different theoretical approaches to derive the main TSA equation of isotropic materials. The main TSA equation of generally anisotropic and orthotropic materials is also shown. Furthermore, the influence of temperature on thermomechanical features of the materials is investigated. By comparing several construction and model materials it is shown that makrolon is the most suitable material for model making in the thermoelastic stress analysis.

Recent development in thermoelastic stress analysis

“…which correlates the first stress invariant on the surface to the output signal, but only provided that pure cycling loading is applied (0'11/ = 0). The second approach is not limited to pure cycling loading, and the derived expression correlates the changes in the first stress invariant and output thermoelastic signal [4],…”

“…The fraction in front of the bracket in the second part of the expression represents the thermoelastic constant K K=~ (4) PC.…”