Basic Study of Caustics Properties under Thermal stress Fields : In Case of Axial Symmetrical one Dimensional Stress Field

Abstract

We applied shadow optical method of caustics to measure the thermal stress distribution around a cylindrical heater inserted in a thin disk of acrylic. The caustics pattern has a circular shape centered to the heater. Heating rate range is 0.25,0.5,0.75 and 1℃/sec. Caustics pattern appears at a certain stress value increase in diameter size up to reach the steady state as well increasing in brightness. A strong relation between caustics pattern and radial stress peak had been found. For that, Caustics experimental method could be used to show thermal stress distribution.