STP710: A Computerized Data Acquisition System for High-Temperature, Pressurized-Water, Fatigue Test Facility

    Cullen, WH
    Metallurgist and mechanical engineers, Naval Research Laboratory, Washington, D.C.,

    Menke, BH
    Metallurgist and mechanical engineers, Naval Research Laboratory, Washington, D.C.,

    Watson, HE
    Metallurgist and mechanical engineers, Naval Research Laboratory, Washington, D.C.,

    Loss, FJ
    Metallurgist and mechanical engineers, Naval Research Laboratory, Washington, D.C.,

    Pages: 14    Published: Jan 1980


    Abstract

    The hardware and software of a data acquisition system for a high-temperature, high-pressure water fatigue crack growth facility is described in this article. This system monitors crack lengths of 15 specimens, together with water pressures, temperatures, and water chemistry data such as dissolved oxygen content, pH, and specific conductance. The measurement strategy is defined by the cyclic count: each of the specimens has its unique measurement targets and measurement interval. The computer constantly compares the instantaneous accumulated count with the count targets of the 15 specimens and enters a data acquisition subprogram when any count target is reached. The methods of data acquisition, data reduction, file management, input/output and system status modification are described.

    Keywords:

    fatigue (materials), corrosion fatigue, autoclave, computers, data acquisition, automation


    Paper ID: STP29254S

    Committee/Subcommittee: E28.15

    DOI: 10.1520/STP29254S


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