On a method to deduce friction-induced temperatures from thermal strain measurements in the dry sliding of metallic pairs

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This paper proposes a procedure to utilize thermal strains as a thermometric mean to recover the temperature distribution in tribo-specimens. The procedure is demonstrated in relation to strain data obtained by the analysis of the so-called “ Double Exposure Speckle Grams”. Total strain components, are resolved into: elastic, plastic, and thermal. These in turn are used to construct a system of difference equations, the solution of which, yields a complete characterization of the strain fields. Thermal strains are subsequently fed in a look-up table containing the coefficient of thermal expansion- for the test material at different temperatures to yield the temperature distribution. The results are validated by comparison to an analytical model and, relevant experimental data.