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    STP1248

    Load Damping Absorbers and the Determination of Load/Displacement Data for Precracked Charpy Specimens

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    Abstract

    A mechanical damping technique is described where a soft metal absorber attached to the leading edge of the striker is used to reduce the inertial oscillatory component of dynamic load time records. A technique is also presented which generates specimen load line displacement data indirectly from force/time information. A comparison of damped and undamped impact records indicates that the tested absorber configuration is an effective method of reducing inertial load oscillations. The experimental evidence indicates that the elastic and plastic machine load-displacement relationships can be accurately determined under the impact conditions generated in a precracked Charpy test. The procedure presented eliminates the requirement for using a dedicated device for the measurement of specimen displacement when absorbers are used to remove the inertially generated load oscillations.

    Keywords:

    Fracture, precracked Charpy, three point bend, machine compliance, mechanical damping, pendulum tester, impact testing


    Author Information:

    KarisAllen, KJ
    Defence Scientist, Defence Research Establishment Atlantic, Dartmouth, Nova Scotia

    Matthews, JR
    Defence Scientist, Defence Research Establishment Atlantic, Dartmouth, Nova Scotia


    Committee/Subcommittee: E28.01

    DOI: 10.1520/STP14667S