Gradienter for split-Hopkinson-pressure-bar splitting test piece

Abstract

A disclosed gradienter for split-Hopkinson-pressure-bar splitting test piece mainly comprises a protective shield, a support, a half-thread bushing, a balancing tray and a fixed bar. The protective shield is formed by a protective-shield rear cover, a protective-shield front cover and two side baffle plates, and the center part of each side baffle plate is provided with a circular hole for passing of a split Hopkinson pressure bar; and the upper surface of the support is an oblique surface, the fixed bar is fixedly disposed on the upper surface, the upper part of the fixed bar is connected with the balancing tray through the half-thread bushing, the height of the balancing tray is adjusted by rotating the half-thread bushing, and the upper surface of the balancing tray is provided with scale. During experiment, the test piece is put at a corresponding scale, and by adjusting the vertical-direction height and the horizontal-direction scale, the fact is guaranteed that the diameter direction of a middle cross section along the height direction of the test piece is collinear with axes of an incidence bar and a transmission bar in the split Hopkinson pressure bar, and thus the precision of the splitting test is improved.

Description

technical field [0001] The invention belongs to the field of mechanical test devices, and in particular relates to a leveling instrument for a Hopkinson compression bar splitting test piece. Background technique [0002] In recent years, the research on the dynamic mechanical properties of rock materials has become a hot topic. Under the action of dynamic load, the dynamic tension mechanical properties of this kind of material are the same as those under compression, but the dynamic tension experiment has high requirements on equipment, and the success rate is very low. Compared with the uniaxial compression experiment, the results are less , at present, it is more widely used to carry out the Brazilian disk splitting experiment by using the separate Hopkinson pressure rod device. During the test, the specimen is sandwiched between the incident rod and the transmission rod in the radial direction. The crack initiation point of the specimen is at the center point of the spec...

AI Technical Summary

Problems solved by technology

One of the causes of stress concentration in the specimen is that the axis of the entire system is not well aligned. Therefore, it is necessary to ensure that the diameter direction of the middle section of the specimen along the height direction is on the same line as the axis of the incident rod and the transmission rod during the test. In the dynamic splitting test, the visual method is often used to achieve this purpose, which has an impact on the accuracy of the test

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