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
    Volume 4, Issue 6 (November 1976)

    Alignment Problems in the Tensile Test

    Published Online: 01 November 1976


      Format Pages Price  
    PDF (572K) 13 $25   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


    Uniaxial tensile testing is a method used throughout the world to measure the strength and ductility of materials. An important aspect of uniaxial tensile testing which often goes unrecognized is test system alignment. Poor alignment can significantly influence test results at small strains, especially the fracture strengths of materials in a brittle state. The purpose of this review paper is to enable a reader to identify sources of misalignment, recognize the effects of misalignment on tests results, evaluate the extreme surface bending strains and stresses, and become acquainted with some techniques for reducing misalignments to within tolerable limits. Numerous references are made to the literature which describes how misalignment may be influenced by couplings in the loading train and by specimen design. A quantitative assessment of the devices and techniques discussed in this literature is made in those cases where sufficient data have been provided. The literature surveyed indicates that misalignment in carefully designed and precisely machined testing systems ranges between 3 and 15% bending. The need for reporting the misalignment at which a given test result is obtained is pointed out.

    Author Information:

    Christ, BW
    Acting ChiefMember of ASTM, Mechanical Properties Section, Metallurgy Div., National Bureau of Standards, Washington, D.C.,

    Swanson, SR
    Technical directorMember of ASTM, Spar Aerospace Products, Ltd., Toronto, Ontario

    Stock #: JTE11371J


    DOI: 10.1520/JTE11371J

    Title Alignment Problems in the Tensile Test
    Symposium ,
    Committee E28