A natural fiber material tensile property test specimen for a round jaw clamp

Abstract

This utility model relates to the field of tensile property testing technology for fiber materials, and particularly to a tensile property testing specimen for natural fiber materials using a round jaw clamp. The specimen includes natural fiber material, metal reinforcing sheets, and epoxy resin. The natural fiber material is a rectangular strip with a uniform cross-section. Metal reinforcing sheets of equal width are bonded to both ends of the natural fiber material using epoxy resin. Epoxy resin is applied to the surfaces of the natural fiber material and the metal reinforcing sheets. The thickness of the epoxy resin coating on the surface of the natural fiber material gradually decreases from both ends towards the middle, so that the stress at both ends of the specimen gradually and smoothly changes. This avoids stress concentration caused by abrupt changes in the cross-section between the clamping parts at both ends and the middle test section, which could lead to abnormal failure. This also increases the friction between the tensile specimen and the round jaw clamp, preventing stress concentration at both ends of the tensile specimen and improving the reliability of the test.

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