ASYMPTOTICS OF THE INTENSITY FACTORS FOR STRESSES INDUCED BY HEAT-SOURCES

Plane quasi-static thermoelastic problems are studied for domains of a rbitrary shape with a slit. Special attention is paid to the case of p oint heat sources. Three types of boundary conditions are considered o n the sides of the slit: ideal contact, zero temperature, and heat iso lation. For each of them the leading terms of the asymptotics of tensi le and shear stress-intensity factors as t --> 0 are obtained. We show , in particular, that a point heat source placed near one of the ends of a finite rectilinear crack, while inducing compressive stresses nea r this end, can cause dangerous tensile stresses in a neighborhood of the other end.