Air valve device for stretching experiment

Abstract

The invention discloses a valve device which is used in a tensile test and which comprises a transmission rod, an incidence rod, a flange, a loading cylinder, a connecting sleeve, a push-pull rod and an accelerating cylinder. The valve device is characterized by comprising an emitting valve, an inlet valve, a sliding block, an air-chamber cavity and a gun tube. The air-chamber cavity is cylindrical; two ends of the air-chamber cavity are sealed by an end cap and form an air chamber with the gun tube; a half of the gun tube is arranged in the air-chamber cavity and the other half extends out of the right end cap of the air-chamber cavity; the sliding block is arranged at the left end of the air-chamber cavity and is sleeved on the gun tube; thus part of the sliding block can move leftwards and rightwards along the periphery of the gun tube; the radial center of the sliding block on the gun tube is provided with an air intake; the loading cylinder is arranged in the gun tube; the internal circle of the loading cylinder matches the incidence rod in a sliding way; the external circle of the loading cylinder matches the gun tube in a sliding way. Because of the arrangement of the sliding block, the pressure difference on two sides of the sliding block can be applied to the experiment; the sliding block moves coaxially along the incidence rod and the gun tube; the valve device has the advantages of simple operation and high reliability, and prevents the problem of eccentric loading.

Description

technical field [0001] The invention relates to a stretching gas valve device, in particular to a gas valve device used in stretching loading experiments. Background technique [0002] refer to figure 2 , the document "Patricia Verleysen, Joris Degrieck, Experimental investigation of the deformation of Hopkinson bar specimens, International Journal of Impact Engineering [J], 30 (2004) 239-253" discloses a high strain rate dynamic tensile performance test for materials. The tensile test device used includes a transmission rod 1, an incident rod 9, a flange 10, a loading cylinder 11, a connecting sleeve 14, a push-pull rod 15, and an acceleration cylinder 16. Both the transmission rod 1 and the incident rod 9 are placed on the support of the platform, one end of the incident rod 9 is fixedly connected to the flange 10 , and the other end is connected to the transmission rod 1 through the tensile sample 2 . The loading cylinder 11 is sleeved on the incident rod 9 and can move...

AI Technical Summary

Problems solved by technology

[0004] In order to overcome the deficiencies of the prior art, which are prone to misfiring, complex operation, and easy to cause eccentric loading on the sample, the present invention provides an air valve device for tensile experiments, which realizes inflation and rapid A large flow of gas is released, and the gas directly pushes the coaxial and freely slidable loading cylinder on the incident rod. The loading cylinder moves to the end of the incident rod and collides with the end flange to generate a tensile stress pulse. This pulse is connected to the incident rod. The specimen between the rod and the transmission rod is dynamically loaded

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