Short beam shear test fixture

摘要

The test fixture includes a housing, a first grip, and a second grip. The first grip and the second grip are each configured to clamp onto an upper surface and lower surface of a material coupon. The test fixture also includes an upper input jaw and a lower input jaw each configured to clamp onto the material coupon near a center of the upper surface and the lower surface of the material coupon. The test fixture is configured to load the material coupon in a first direction and a second direction. The first grip and the second grip are each configured to clamp onto the material coupon at a location which accordingly results in a desired testing ratio regardless of a variation in thickness of the material coupon.

主权项

1. A test fixture for load testing a material coupon, the test fixture comprising:
a housing having a first interior portion and a second interior portion; a first grip configured to clamp onto an upper surface and a lower surface at a first end portion of the material coupon, the first grip further being configured to mate against the first interior portion of the housing at a first upper slope surface and a first lower slope surface; a second grip configured to clamp onto the upper surface and the lower surface at a second end portion of the material coupon, the second grip further being configured to mate against the second interior portion of the housing at a second upper slope surface and a second lower slope surface; an input jaw configured to clamp onto the material coupon near a center portion of the material coupon; wherein the first upper slope surface, the first lower slope surface, the second upper slope surface, and the second slope surface each have a slope angle that causes the first grip and the second grip to contact the material coupon at a length location that is dependent upon a thickness of the material coupon; wherein the first grip is configured to clamp onto the upper surface and the lower surface at the first end portion of the material coupon with a clamping force, the clamping force being adjustable by a first grip adjustment knob; and wherein the first grip adjustment knob is configured to adjust a first compression spring that provides a spring force against a body portion of the first grip.