Shock Tester for Shipping Containers

    Published: Jan 1956

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    The object of this investigation was to develop a method of testing shipping containers for the longitudinal shocks encountered during railroad switching operations. Field data were gathered by measurement of accelerations encountered on a railroad car during various controlled switching conditions at speeds up to 10 mph. Shock spectra were prepared from the acceleration-time curves recorded. The test method employs an inclined ramp which supplies the energy for the system. The container to be tested is attached to a cart which is allowed to roll down the ramp and strike a stack of rubber pads that are attached to a fixed bumper. The shock pulse wave form obtained is reproducible. The magnitude and duration of the shock pulse to be applied to a given container are governed by the dynamic response of an undamped simple single-degree-of-freedom system having a natural frequency equal to the resonant frequency of the container shock mitigating system. The response is obtained from the shock spectra which was prepared from field data. The ramp test fixture will simulate the longitudinal shocks, encountered during railroad switching, up to impact velocities of 8 mph for shock mitigating systems with resonant frequencies below 20 cps.

    Author Information:

    Cross, W. H.
    Project Engineer and Supervisor, Sandia Corp., Albuquerque, N. Mex.

    McWhirter, Max
    Project Engineer and Supervisor, Sandia Corp., Albuquerque, N. Mex.

    Committee/Subcommittee: E01.01

    DOI: 10.1520/STP47584S

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