Method and apparatus for measuring the residual tension in a stud or a bolt
First Claim
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1. A method for determining the residual tension in a fastener, the method including the steps of:
- applying increasing tension forces to a fastener to elongate the fastener;
determining the elongation of the fastener for various tension forces;
generating a force-strain curve data to relate the increasing force applied to the fastener to the elongation of the fastener; and
determining the residual preload of the fastener as a function of the initial slope of the generated force-strain curve data.
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Abstract
A method and apparatus for determining the residual force or tension in a bolt or stud is presented. The bolt or stud in a previously tightened joint is stressed by the imposition of a pulling force, the resulting strain on the bolt is measured to develop a force-strain relationship, and the measured force-strain relationship is compared to previously determined force-strain relationships for the joint to determine the residual force or tension in the bolt or stud.
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Citations
6 Claims
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1. A method for determining the residual tension in a fastener, the method including the steps of:
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applying increasing tension forces to a fastener to elongate the fastener; determining the elongation of the fastener for various tension forces; generating a force-strain curve data to relate the increasing force applied to the fastener to the elongation of the fastener; and determining the residual preload of the fastener as a function of the initial slope of the generated force-strain curve data. - View Dependent Claims (2, 3, 4, 5, 6)
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Specification