A compression relaxation test device

Abstract

The invention relates to a compression relaxation test device, which comprises a test bench for placing a test sample, a guide rail assembly, a hammer arranged to slide with the guide rail assembly along the length direction of the guide rail assembly, and the hammer can be connected to the A release mechanism connected separately and a lifting mechanism connected with the release mechanism and used to lift the hammer to a specified height, the hammer is used to compress the sample, in particular, the compression The relaxation test device further includes a locking mechanism, and when the compressive load of the hammer on the sample reaches a maximum compression amount, the locking mechanism relatively locks the hammer and the guide rod assembly. The compression relaxation test device of the present invention can realize high strain rate loading on the tested sample, and when the hammer moves to a specified position, the locking mechanism implements displacement locking, and the hammer remains stationary for a long enough time.

Description

technical field [0001] The invention belongs to the field of dynamic testing and characterization of mechanical properties of materials, is used in industries such as automobiles and aviation, and relates to a compression relaxation test device. Background technique [0002] Rubber materials are widely used in the automotive industry, such as tires, engine mounts, door seals, crash test dummies, etc. The research on the mechanical properties of rubber materials under high strain rate is of great significance for improving the crash safety of automobiles and establishing a finite element model of crash test dummy with accurate mechanical response prediction. [0003] In the automobile crash test, the deformation rate of the rubber material parts of the test dummy can reach 100 / s, and the mechanical behavior of the rubber under this dynamic load is significantly different from the quasi-static condition. In order to accurately describe the dynamic mechanical properties of rub...

AI Technical Summary

Problems solved by technology

[0004] Ordinary drop hammer test bench, the free fall movement of the hammer head realizes high-speed compression test, but the displacement of the hammer head cannot be controlled. The electronic universal testing machine adopts the principle of closed-loop control, which can control the loading displacement, but cannot perform high-speed compression test, while the hydraulic type high-speed Although the tensile testing machine can achieve rapid impact loading, it cannot control the loading displacement because of the open-loop control

The existing experimental equipment for rubber stress relaxation is mainly aimed at the stress change during the aging process of rubber, and cannot achieve rapid loading

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