TERSA - A New Technique For Assessing Residual Stress

Abstract

This paper outlines a completely new technique which could provide the basis of an instrument for the noncontacting and non-destructive determination of static and residual stresses in engineering components, assemblies and structures. The method has been given the acronym of TERSA, standing for Thermal Evaluation for Residual Stress Analysis and would be applicable to a range of metals, both ferrous and nonferrous and also to plastics. Some experimental work is described and results are presented which confirm the principle of the proposal.

Stress dependence of specific heat: observations on the TERSA technique

“…In this paper, it has been shown that the stress dependence of specific heat is unlikely to form a significant contribution to the results noted in Ref. 1. This has been supported by both a theoretical derivation for the stress dependence of specific heat and previous experimental evidence for the stress dependence of the thermoelastic parameter.…”

Analysis of stress influence on thermal diffusivity by photothermal infrared thermography

“…Then, a few percent variation of the thermal properties is to be expected within the elastic domain [2,3].…”

“…The expected variations of thermal conductivity and specific heat as functions of stresses are estimated through their dependencies on temperature, together with the classical Hooke-Duhamel behaviour [1]. These temperature dependencies are available in the literature and few percent variations of thermal properties are to be expected within the elastic domain [2,3].…”