STP488

    Axiality Measurements on Fifty Creep Machines

    Published: Jan 1971


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    Abstract

    Three types of creep machines were tested with a normal load string and specimen. One of these and one of a fourth type also were tested with a single rod replacing the normal load string. On the average, each type has bending strains within the ASTM allowable limits when tested at high stresses. The load strings with the higher temperature ratings also have the larger bending strains. For most machines the percent bending increases as the tensile stress decreases. Since the higher temperature tests usually are made at lower stresses, the two relationships above indicate that most of the tests at temperatures over 1800 F (1000 C) will have bending strains exceeding the allowable limits. Most of the nonaxiality of loading appears to be due to loose threads or machining imperfections in the couplings. The contributions to bending of crossed knife edge connectors, specimen imperfections, and strain gage inaccuracies are found to be small.

    Keywords:

    tension tests, tensile testers, test equipment, tensile stress, strains, strain gages, loads (forces), creep properties, bending, bending stress, elastic deformation


    Author Information:

    Schmieder, AK
    Manager and technician, Physical Testing, Materials and Processes Laboratory, Large Steam Turbine-Generator Div., General Electric Co., Schenectady, N. Y.

    Henry, AT
    Manager and technician, Physical Testing, Materials and Processes Laboratory, Large Steam Turbine-Generator Div., General Electric Co., Schenectady, N. Y.


    Paper ID: STP26904S

    Committee/Subcommittee: E08.03

    DOI: 10.1520/STP26904S


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