You are being redirected because this document is part of your ASTM Compass® subscription.
    This document is part of your ASTM Compass® subscription.

    If you are an ASTM Compass Subscriber and this document is part of your subscription, you can access it for free at ASTM Compass

    Checking and Improvement of the Alignment of Flat Specimen Gripping Devices

    Published: 01 January 1989

      Format Pages Price  
    PDF (376K) 24 $25   ADD TO CART
    Complete Source PDF (4.8M) 248 $65   ADD TO CART

    Cite this document

    X Add email address send
      .RIS For RefWorks, EndNote, ProCite, Reference Manager, Zoteo, and many others.   .DOCX For Microsoft Word


    The reliability of results of fatigue tests depends to a high degree on the accuracy of the alignment of the gripping devices used. Misalignments can result in undesired additional stresses and strains in the specimen under test and can lead to inaccurate test results. A method is presented by means of which the alignment of flat specimen grips can be checked and steps for its improvement derived using a specific set of strains, which are measured at eight selected points of a dummy specimen clamped in its four possible gripping positions. The mathematical description of the strains in the clamped specimen, including those caused by a productional precurvature, leads to an analysis of the measured strains by means of an evaluation scheme which is derived from the obtained mathematical equations and tailor-made for the use of a computer. The results of the analysis allow judgment as to the accuracy of the alignment and the derivation of steps for its improvement.


    gripping device, alignment

    Author Information:

    Fischer, R
    Carl Schenck AG, Darmstadt,

    Haibach, E
    Seilpruefstelle der WBK, Bochum,

    Committee/Subcommittee: E28.94

    DOI: 10.1520/STP24018S