×

FATIGUE STRAIN GAUGES

  • US 3,779,071 A
  • Filed: 09/13/1971
  • Issued: 12/18/1973
  • Est. Priority Date: 09/13/1971
  • Status: Expired due to Term
First Claim
Patent Images

1. A safety gauge suitable for measuring irreversible mechanical damage in a structural part during or after use thereof, said gauge being incorporated in said structural part as an integral part thereof and comprising:

  • a resin matrix material;

    a bundle of conducting graphite filaments disposed in said matrix material, said filaments being generally separated from adjacent filaments by matrix material;

    means to measure the resistivity across said filament bundle;

    electrical leads attached to the ends of said filament bundle and to said measuring means, whereby the resistivity across said bundle is measured to determine the fatigue of said structural part during or after use thereof, fatigue being indicated by fracture of some or all of said filaments.

View all claims
  • 17 Assignments
Timeline View
Assignment View
    ×
    ×