Static and dynamic four-point bending experimental device

Abstract

The invention discloses a static and dynamic four-point bending experimental device. The static and dynamic four-point bending experimental device comprises a device main body, a first loading part and a second loading part for loading a test sample, and a first support part and a second support part for supporting the test sample, wherein the device main body comprises a first runner and a second runner, the distance between the first runner and the second runner is adjustable, the first runner and the second runner are connected through a belt, the first loading part and the first support part are arranged on the first runner, the second loading part and the second support part are arranged on the second runner, and when the belt is subject to downward impact force, the belt drives the first runner and the second runner to rotate, the first loading part and the second loading part are simultaneously loaded on the upper surface of the test sample, and the first support part and the second support part are simultaneously supported on the lower surface of the test sample. The static and dynamic four-point bending experimental device has the advantage of being capable of adjusting the pure bending distance of the test sample, and is suitable for the test samples in various sizes.

Description

technical field [0001] The invention relates to a bending test device, in particular to a static and dynamic four-point bending test device. Background technique [0002] At present, the four-point bending experimental device has been widely used. Chinese invention patent specification CN102706739A discloses a four-point bending flexible support device, which includes a loading assembly and a supporting assembly. The loading assembly includes a hanger and two loading parts for loading the upper surface of the sample. The two loading parts Set on the hanger, the support assembly includes a fixed base and two support parts for supporting the sample. The two support parts are set on the fixed base. During the experiment, the sample is placed on the support part, and the two loading parts The sample exerts a downward force, and at the same time, the two supporting parts exert two reaction forces of equal magnitude on the sample, and the distance between the two loading points o...

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Problems solved by technology

[0003] Such four-point bending test device has the following defects: 1. Since two loading parts are required to act on the sample at the same time during the four-point bending test, the existing experimental device is divided into a loading assembly and a supporting assembly, and two of the loading assemblies The loading part is fixed on the same hanger and cannot move laterally, which leads to the non-adjustable pure bending distance on the sample, which limits the size of the sample; 2. In the dynamic impact test of the four-point bending Hopkinson compression bar , the experimental device needs to be placed horizontally so that the sample can withstand the impact from the horizontal direction. The existing experimental device cannot be placed horizontally on the ground smoothly. 3. In the four-point bending drop hammer dynamic impact test, the fixed base of the existing experimental device is too large to be placed in the four-point bending drop hammer dynamic impact test. Between the trusses for the impact test, so it is not suitable for this test

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