THERMAL STRESS-FOCUSING EFFECT FOLLOWING RAPID NONUNIFORM HEATING OF LONG CYLINDRICAL RODS

When a cylinder is suddenly subjected to an instantaneous heating on its cross-section, stress waves occur at the surface of the cylinder the moment thermal impact is applied. The stress waves in a cylinder proceed radially inward to the center of the cylinder. The wave may accumulate at the center and give rise to very large stress magnitudes, even though the initial thermal stress may be relatively small. This phenomenon is called the stress-focusing effect. In this article, we show that the phenomenon of thermal stress-focusing effect should occur in a cylinder heated by rapid nonuniform heat. The analytical results give a clear indication of the mechanism of thermal stress-focusing effects and clarify the order of singularity of the stress-focusing effects in a cylinder caused by instantaneous nonuniform heating.