Mechanical properties of crystalline solids. Progress report, December 1, 1979-November 30, 1980

The work performed during the past fiscal year included in the materials area: the development of microstructural basis for a second generation state variable deformation model; the continuation of the work on a unified model for grain boundary anelasticity and grain boundary sliding; the continued investigation of the grain boundary cavitation process in the Zircaloys; and the application of a state variable approach in materials characterization. In the mechanics area: a finite element analysis of thermal stress transients in structures; and the application of the boundary element method to plate bending and fracture. Type 316 stainless steel, Nickel 270, and Zircaloy-2 and -4 were the materials used. 35 figures.