Method for fabricating high-temperature tensile test specimens
AssigneeGeneral Dynamics Corporation Air Defense Systems Division
InventorWilson N. Pratt
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Abstract
A carbon composite tensile test specimen for high temperature testing and a method of fabricating the same are disclosed. A plurality of holes are drilled in first and second end sections of the specimen and then the end sections are electroplated with nickel. The nickel plating of the end sections prevents breakage of the ends in the jaws of a tensile testing apparatus. For high-temperature testing, a standard-sized specimen may be used with the jaws in the hot zone.
Claims6
A method of eliminating the breakage of specimen bars of carbon composite materials in the gripping jaws of a tensile test apparatus during high-temperature testing, comprising the steps of:
- a) drilling a plurality of holes through first and second end portions of a specimen bar of a carbon composite material on opposite sides of a longitudinal axis thereof and transverse to parallel surfaces of said bar which are gripped in said test apparatus during testing, there being a tensile test portion of said bar extending between said first and second end portions and contiguous therewith;
- and
- b) plating said first and second end portions of said bar including the circumferential walls of said holes with a selected metal to a predetermined thickness, said metal being nickel.
A method of eliminating the breakage of specimen bars of carbon composite materials in the gripping jaws of a tensile test apparatus during high-temperature testing, comprising the steps of:
- a) drilling a plurality of holes through first and second end portions of a specimen bar of a carbon composite material on opposite sides of a longitudinal axis thereof and transverse to parallel surfaces of said bar which ar gripped in said test apparatus during testing, there being a tensile test portion of said bar extending between said first and second end portions and contiguous therewith;
- and
- b) plating said first and second end portions of said bar including the circumferential walls of said holes with a selected metal to a predetermined thickness;
- wherein said metal is nickel and said thickness is approximately 0.005 inch.
Dependencies are inferred from the claim text.