Special fixture for tensile testing of metal sheet or metal foil and method of use

Abstract

The invention relates to a tensile test special fixture used for sheet metal or metal foil. The tensile test special fixture comprises an upper clamping head, a lower clamping head, two sets of guide post guide sleeves and threads through which the upper clamping head is connected with a stretcher stretching head base seat, wherein the upper clamping head comprises a T-type clamping component, a small clamping component and two pairs of bolts and nuts, and the upper clamping head is same to the lower clamping head in structure. Through holes are reserved in the upper clamping head and the lower clamping head along the direction parallel to the sample tensile direction, an upper guide sleeve is installed in the lower clamping head through hole, and the upper clamping head through hole is connected with the guide sleeves through guide posts. Bolt holes are reserved in the T-type clamping component and the small clamping component which are in the upper clamping head along the direction perpendicular to the sample tensile direction, and samples are clamped due to the fact that the two groups of bolts penetrate through the reserved holes of the clamping components. The tensile test special fixture used for the sheet metal or the metal foil is simple in structure and convenient to install and clamp, and overcomes various difficulties when the sheet metal and the metal foil are stretched.

Description

technical field [0001] The patent of the present invention relates to the fixture used in the measurement technology, more specifically, the patent of the present invention relates to a special fixture for tensile testing of metal sheets and metal foils. Background technique [0002] Tensile test, also known as tensile test, is a test used to determine a series of properties of materials under tensile load; it is one of the basic methods of material mechanical performance testing, and is mainly used to check whether the material meets the specified standards and Study the performance index of material, such as strength index and plasticity index. [0003] The fixture used in the existing tensile testing machine is connected to the sample through a perforated pin, and the tensile testing machine transmits the load to the sample through the perforated pin to perform a one-way or two-way tensile test. The required tensile test can be completed under the condition that the thic...

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Problems solved by technology

[0003] The fixture used in the existing tensile testing machine is connected to the sample through a perforated pin, and the tensile testing machine transmits the load to the sample through the perforated pin to perform a one-way or two-way tensile test. The required tensile test can be completed under the condition that the thickness of the material is more than 1mm; when the thickness of the sheet is relatively thin, especially when the thickness of the sheet is less than 0.5mm or even the thickness of the metal foil is less than 0.1mm, the perforation pin is very easy to pass the sample On the other hand, due to the thinning of the sample thickness, the direction of the load applied by the tensile testing machine does not coincide with the geometric center of the sample, which is easy to produce eccentricity, which causes the test to fail. For metal foil samples, due to the scale effect, the influence of errors caused by eccentricity will be more significant

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