Dynamic Finite Element and Dynamic Photoelastic Analyses of an Impacted Pretensioned Plate.

摘要

Dynamic finite element and dynamic photoelasticity were used to analyze ESSO type fracture toughness specimen machined from Homalite-100 sheets of 9.5 mm thickness. Crack velocities determined from photoelasticity experiments were prescribed in the dynamic finite element analysis for the purpose of establishing numerically a dynamic fracture toughness which varies with the crack velocity. Qualitative agreement between dynamic energy release rates determined by the two procedures were found, provided an appropriate impuse was prescribed in the dynamic finite element analysis. The dymamic finite element analysis also provided results with sufficient time resolution to confirm our postulage that K sub d = K sub c at the onset of crack propagation in Homalite-100 plates and that K sub a varies in these test specimens. (Author)