Detection of stresses induced by heat flux in a solid by using a photoelastic microscope
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Abstract
The aim of this paper is to present adventures of practical and effective modulation polarimetry method (MPM) applied to the plate sample of quartz glass for detection of its minute internal thermoelastic stresses induced by heat wave propagation. Described MPM allowed to make accurate measuring of birefringence that accompany the dynamics of thermoelasticity and made possible to calculate the value of stress distribution along and crosswise to the direction of heat flow at certain moments of time, as well as its dependence on time in defined heat flux coordinates. The main goal of this paper is not only the solution of inverse problems of nonstationary thermoelasticity that allowed obtaining spatio-temporal temperature functions by graphical integration of the experimental characteristics but researching the dynamics of the maximum curvature point of the temperature function T(t) that is a characteristic of the thermal front in the process of heat flow establishment. In addition, it is shown that due to the high detectability of MPM applied in photoelastic microscope became possible to observe the radiation component of the heat transfer process.
References 20, figures 5.
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