Abstract
This paper focuses on the thermoelastic behavior of chalcogenide glasses. For this purpose, an original experiment was developed to measure the thermal field at the surface of an AsSe glass specimen submitted to cyclic mechanical loading. The specimen geometry was chosen in such a way that a high stress gradient was induced by the loading conditions. The temperature field was measured by means of infrared thermography. The framework of thermal stress analysis (TSA) was then used to successfully map the stress field at the surface of the specimen by processing the thermal fields. The main result is that classical thermoelastic response is observed in chalcogenide glass without disturbances such as photo-irradiation. This work is a first step towards the characterization of the thermomechanical sensitivity of chalcogenide glasses.
Highlights
Chalcogenide glasses have been intensively studied for a decade, due to their particular optical properties, especially their transparency in the infrared domain
An original experiment was developed to measure the thermal field at the surface of an AsSe glass specimen submitted to cyclic mechanical loading
The temperature field was measured by means of infrared thermography
Summary
Chalcogenide glasses have been intensively studied for a decade, due to their particular optical properties, especially their transparency in the infrared domain. In the context of the thermomechanics of materials, IR cameras are used to capture the temperature changes of specimens subjected to mechanical loadings Phenomena such as thermoelasticity, fatigue, plasticity, viscosity or phase change lead to temperature changes which can be tracked during mechanical tests. Thermoelastic coupling leads to heat production or absorption as a function of the stress variation This coupling is the fundament of the thermoelastic stress analysis (TSA) technique which, under some test conditions, provides a stress map of the surface of the specimen [17,18].
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