Computer Assisted Impact Testing

    Published: Jan 1980

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    A data acquisition system is described for use in instrumented tests of Charpy impact specimens, both standard and precracked types. The load signal from strain gages in an instrumented striker is amplified and stored in a digital oscilloscope where it is analyzed by the operator. A laboratory calculator is used to assist the operator in the conduct of the test, to store the raw data and other pertinent data taken by the operator, to integrate this data, and to compute parameters needed to determine various alternative measures of fracture toughness. The software described is designed to assist the operator in the conduct of standard and precracked Charpy tests, and much of it is readily adaptable to tests of other types of specimens. Raw data of load versus time are analyzed using values obtained from the operator's interpretation of the raw data. The calculator then operates on the data to compute various results, such as energy to maximum load, total energy absorbed, etc. A magnetic tape is used to store the raw data, test variables, and various other information, such as computed results and operator selected points of load on the load-time record. To assist the operator in the interpretation of the data and in the selection of test conditions for a series of tests, two other peripherals are used. A plotter furnishes a record of test response as a function of test temperature, and a printer provides a detailed record, for each test, of the information stored on the tape.


    Charpy V-notch, computer automation, impact testing, instrumented Charpy testing, laboratory calculator, materials testing, computers, automation, data acquisition

    Author Information:

    Interrante, CG
    Metallurgist and physicist, National Bureau of Standards, Washington, D.C.,

    Low, SR
    Metallurgist and physicist, National Bureau of Standards, Washington, D.C.,

    Committee/Subcommittee: E28.07

    DOI: 10.1520/STP29257S

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