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Static tensile tests on material for mechanical constructions have pointed out the linearity loss of\udthe surface temperature with the application of load. This phenomenon is due to the heat generation caused by\udthe local microplasticizations which carry the material to deviate from its completely thermoelastic behavior,.\udThe identification of the static load which determines the loss of linearity of the temperature under stress,\udbecomes extremely important to define a first dynamic characterization of the material.\udThe temperature variations that can be recorded during the static test are often very limited (a few tenths of\uddegree for every 100 MPa in steels) and they require the use of special sensors able to measure very low\udtemperature variations. The experience acquired in such analysis highlighted that, dealing with highly accurate\udsensors or with particular materials, the identification of the first linearity loss (often by eye) in the temperature\udcurves, can be influenced by the sensibility of the investigator himself and can lead to incorrect estimates. The\udaim of this work is to validate the above mentioned observations on different steels, by applying the\udautocorrelation function to the data collected during the application of a static load. This, in order to make the\udresults of the thermal analysis free from the sensitivity of the operator and to make the results as objective as\udpossible, for defining the closest time of the linearity loss in the temperature-time function

Definition of the linearity loss of the surface temperature in static tensile tests