Gage for measuring decrease in dimension of test specimen in tensile test
AssigneeThe United States of America as represented by the Secretary of the Air Force
InventorsDon F. Woods, Ronald F. Larsen
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Abstract
A test gage for measuring the decrease in one dimension of a test specimen having a frame member with a sliding member positioned within the frame member. The test apparatus is adapted to receive a test specimen between the sliding member and one side of the frame member. The sliding member is held in contact with the test specimen by a spring. A proximity measuring device senses the position of the sliding member with respect to the frame member and provides an output signal proportional to displacement. Elastic bands are used to support the test gage on a tensile test machine which is used to apply a stress to the test specimen.
Claims1
A device for measuring the decrease in one dimension of a compression sensitive test specimen in a direction perpendicular to the applied stress in a tensile test machine, comprising:
- a polytetrafluoroethylene frame member;
- a polytetrafluoroethylene slidable member positioned in said frame member;
- a means for providing a low friction bearing between said slidable member and said frame member;
- notches in said slidable and frame members, for receiving a test specimen therebetween;
- a spring positioned between the frame member and the slidable member, on the side of said slidable member remote from said notches;
- and
- a proximity measuring device secured to said frame member and a metallic target secured to the slidable member.
Dependencies are inferred from the claim text.