Accession Number : ADP003115

Title :   Viscoelastic Effect on Dynamic Crack Propagation in Homalite 100,

Corporate Author : ILLINOIS UNIV AT URBANA DEPT OF THEORETICAL AND APPLIED MECHANICS

Personal Author(s) : Kim,K. S. ; Dickerson,K. L. ; Knauss,W. G.

Report Date : OCT 1983

Pagination or Media Count : 21

Abstract : The optical method of caustics is used to determine the stress intensity factor for a running crack in a viscoelastic material. A formulation of the quasi-static deformation of materials with rheologically simple shadow-optic creep functions is derived for the caustics, solved numerically and applied to the fracture testing of Homalite-100 at various temperatures (40 deg C - 100 deg C). Theoretical and experimental caustics show good agreement in shape even for moderately high crack speeds (150 - 300 m/sec). Results also show that the relation between the stress intensity factor and the crack speed for Homalite 100 is highly sensitive to temperature variations. (Author)

Descriptors :   *Materials, *Metals, *Viscoelasticity, *Cracks, *Crack propagation, Caustics, Optics, Stress concentration, Deformation, Creep, Numerical analysis, Equations, Fracture(Mechanics), Dynamic loads, Dynamics, Sensitivity, Temperature, Brittleness, Explosives, Solid rocket propellants, Experimental data, Refractory metals, J integrals, Steady state, Graphs, Symposia

Distribution Statement : APPROVED FOR PUBLIC RELEASE