Accession Number : ADP003112

Title :   Crack Branching, Crack Arrest and Rapid Tearing,


Personal Author(s) : Kobayashi,A. S.

Report Date : OCT 1983

Pagination or Media Count : 9

Abstract : For the past several years, the author and his colleagues have been involved in various aspects of dynamic fracture research where dynamic photoelasticity was used to quantify the dynamic fracture parameters associated with a running crack in photoelastic polymers. The experimental data were also used to verify a dynamic finite element code executed in its generation and propagation modes. Experimentally measured crack velocity was then used to drive the verified finite element code in its generation mode to extract dynamic fracture parameters, which could not be measured directly, in metals and ceramics. In the following, some recent results obtained in three research projects on dynamic fracture using the above mentioned techniques are summarized. These results involve dynamic and static crack branching in Homalite-100 plates and metal pipes, dynamic crack arrest in structural ceramics and rapid tearing of thin polycarbonate sheets. (Author)

Descriptors :   *Polymers, Cracks, Cracking(Fracturing), Crack propagation, Tearing, Finite element analysis, Arresting(Process), Photoelasticity, Dynamic loads, Fracture(Mechanics), Metals, Ceramic materials, Polycarbonates, Aluminum, Stress concentration, Pipes, Plates, Structural analysis, Notch toughness, Silicon nitrides, Graphs, Symposia

Distribution Statement : APPROVED FOR PUBLIC RELEASE