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Ultrasonic load indicating member, apparatus and method

  • US 4,899,591 A
  • Filed: 02/09/1989
  • Issued: 02/13/1990
  • Est. Priority Date: 09/11/1987
  • Status: Expired due to Term
First Claim
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1. A method of making a load indicating fastener from a fastener having a head and a shank extending from the head, said shank being subjected to elastic deformation when stressed longitudinally such that one portion thereof moves relative to another portion thereof, said method comprising the steps of:

  • forming a first flat surface on said head and a location remote from said shank, said first flat surface being normal to the longitudinal axis of said shank;

    forming a piezoelectric sensor by applying a first and a second electrode means to opposite faces of a piezoelectric disk; and

    permanently, acoustically, and mechanically interconnecting said piezoelectric sensor to said head of said fastener such as to electrically interconnect a first electrode of said piezoelectric sensor with said head and, further, such as to isolate said second electrode from said head.

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