Material high-speed stretch tester and test methods thereof

A high-speed tensile and test device technology, applied in the direction of testing the ductility of materials, can solve the problem of low measurement accuracy of impact tensile velocity, inability to obtain accurate material critical impact tensile velocity, scarcity of critical impact tensile velocity data, etc. question

Inactive Publication Date: 2008-04-09
NINGBO UNIV
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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 elong

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  • Material high-speed stretch tester and test methods thereof

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Embodiment Construction

[0015] The present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments.

[0016] As shown in the figure, a high-speed tensile test device for materials includes a gas gun barrel 2 for high-speed launching projectiles 1. A base 3 is fixed at the exit of the gas gun tube 2, and a The coaxial central hole 31 of the gun barrel 2 is coaxially fixed with a sleeve 5 in the central hole 31, and the other end of the sleeve 5 is vertically provided with a plane target plate 8, and the end surface of the base 3 is provided with three Evenly distributed threaded holes 32, the axis of the threaded hole 32 is parallel to the axis of the central hole 31, the plane target plate 8 is provided with a through hole 81 coaxially corresponding to the threaded hole 32, and the outer end surface of the plane target plate 8 is provided with a The test piece 6 is screwed to the fixed block 9, and the side wall of the sleeve 5 is provided wit...

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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...

Claims

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Application Information

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IPC IPC(8): G01N3/28
Inventor 陈大年胡金伟王焕然金扬辉
Owner NINGBO UNIV
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