STP627: Measurements of Dynamic Stress Intensity Factors for Fast Running and Arresting Cracks in Double-Cantilever-Beam Specimens

    Kalthoff, JF
    Physicists, Institut für Festkörpermechanik der Fraunhofer-Gesellschaft, Freiburg,

    Beinert, J
    Physicists, Institut für Festkörpermechanik der Fraunhofer-Gesellschaft, Freiburg,

    Winkler, S
    Physicists, Institut für Festkörpermechanik der Fraunhofer-Gesellschaft, Freiburg,

    Pages: 16    Published: Jan 1977


    Abstract

    The influence of dynamic effects on the crack arrest process is investigated. For propagating and subsequently arresting cracks, actual dynamic stress intensity factors were measured applying a shadow optical technique in combination with a Cranz Schardin high-speed camera. The experiments were performed in wedge-loaded double-cantilever-beam (DCB) specimens machined from an epoxy resin (Araldite B). In the initial phase of crack propagation the measured dynamic stress intensity factors were found smaller; in the arresting phase, however, they were larger than the corresponding static values. After arrest the dynamic stress intensity factor oscillates with decreasing amplitude around the static stress intensity factor at arrest. Crack arrest toughness values determined according to a static analysis showed a dependence on the crack velocity prior to arrest, but the dynamic crack arrest toughness yielded a single value only, indicating that this quantity represents a true material property.

    Keywords:

    stress analysis, photoelasticity, crack propagation, crack arrest, fracture criterion, fracture properties


    Paper ID: STP27387S

    Committee/Subcommittee: E08.06

    DOI: 10.1520/STP27387S


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