Test Methodology for an Investigation into Heating and Cooling Phenomena in Grossly Deformed Tensile Metallic Bars

摘要

The coupling between mechanical deformation and thermal energy in an elastic material, known as the thermoelastic effect, was first documented by Gough in 1805, who observed that the material experienced a change in temperature during elongation. More recently, investigation of the phenomenon of energy exchange in metals has been extended into the plastic regime, where a material experiences heating after the elastic limit has been exceeded, i.e. the thermoplastic effect. It is proposed to measure the local temperature, strain and cross-sectional area of various specimens undergoing adiabatic elastoplastic deformation, and to deduce the local stress. These parameters are necessary if the relationship between the measured temperature and the dissipated and available energies is to be determined. Of the available devices for minute temperature measurements, namely thermistors and infra-red detectors, the latter were chosen for this work. Australia. (JES)