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Quality control for sucker rods

  • US 4,700,577 A
  • Filed: 10/09/1986
  • Issued: 10/20/1987
  • Est. Priority Date: 06/11/1984
  • Status: Expired due to Fees
First Claim
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1. A method for testing the overall quality of a fiberglass sucker rod having a known ultimate strength, comprising:

  • applying tension loads that are less than said known ultimate strength to the end fittings of such a rod,measuring the applied loads and elongation for such a rod,measuring the acoustic emissions from such a rod during said applying of said tension loads,determining from said measured loads and elongation the modulus of elasticity for at least two different load ranges, anddetermining from the difference between said moduli of elasticity whether said end fittings of such a rod are acceptably attached and from said measured acoustic emissions whether the material of such a rod is acceptable.

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