Material high-speed stretch tester and test methods thereof

Abstract

The invention discloses a device for material high-speed stretch test, which is characterized by including a gaseous gun tube for shooting pill at high speed. And the outlet of the gaseous gun tube is fixedly provided with a foundation bed, and the foundation bed is provided with a central hole coaxial with the gaseous gun tube, wherein, at least three test piece fixing holes are evenly distributed around the central hole on the head face of the foundation bed; and the axes of the test piece fixing holes are parallel with the axes of the central hole; a sleeve is coaxially and fixedly arranged within the central hole; a flat target plate fixedly connected with a test piece is vertically arranged at the other end of the sleeve; a 1st speed measuring electric probe for measuring the pill speed is arranged at the side wall of the sleeve; and a 2nd speed measuring electric probe for measuring the stretching speed of the test piece is arranged at the outer side of the flat target plate. The invention has the advantage of giving full play to the capacity of gaseous gun tube driving the pill at high speed, pulling a plurality of stretching test pieces by the impact of pills to the flat target plate, and satisfies the requirements for precise determination of critical impact stretching speed of various materials under random factors.

Description

technical field [0001] The invention relates to a material high-speed tensile test device and a test method for measuring the critical impact tensile velocity of materials. Background technique [0002] Because the elongation characteristics of metal materials during high-speed stretching are better than those during quasi-static stretching, high-speed forming technology for metal components is being more and more widely used in the mechanical field. However, the ductility properties drop abruptly when the stretching speed exceeds a certain critical value, known as the material's critical impact stretching speed, whose theoretical value corresponds to the material's plastic wave cutoff. The test device that can be used to study the critical impact tensile velocity of materials in foreign countries is to impact the tensile test piece through a high-speed hammer driven by a flywheel. The elongation velocity and its measurement accuracy are not high, so the accurate critical i...

AI Technical Summary

Problems solved by technology

The test device that can be used to study the critical impact tensile velocity of materials in foreign countries is to impact the tensile specimen by a high-speed hammer driven by a flywheel. This device was first established by the Watertown Arsenal Laboratory in the United States, but it was found that the impact tensile force that can be obtained by this device was tested in the test. The elongation velocity and its measurement accuracy are not high, so the accurate critical impact elongation velocity of the material cannot be obtained

In addition, due to the lack of effective and efficient material critical impact tensile velocity test equipment and related theoretical research at home and abroad, the critical impact tensile velocity data of various metal materials are relatively scarce.

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