Dynamic double shear test device

Abstract

The invention discloses a dynamic double-shear test device, which includes: an incident rod, a transmission tube, and a double-shear sample; the double-shear sample is arranged between the incident rod and the transmission tube, and the After the incident rod is hit, the incident rod generates a stress wave and loads the double-shear sample; during the loading process, the double-shear sample generates longitudinal shear force at the shear plane and will The stress wave of the longitudinal shear force is transmitted to the transmission tube. The present application enables the testing of the longitudinal shear strength of the fiber / matrix interface under impact loading.

Description

technical field [0001] The invention relates to the technical field of material mechanics tests, in particular to a dynamic double-shear test device. Background technique [0002] In the fields of national defense and industrial production, since structural parts of different materials are often under impact loads, such as aircraft bird strikes, hail impacts, and spacecraft impacts by space debris, and the crashworthiness of automobiles is also related to our lives. And the anti-fall of mobile phones and so on. [0003] Therefore, it is often necessary to perform impact loading tests on test materials, such as typical Hopkinson bar dynamic loading, to obtain the real mechanical response of materials at different loading rates, thereby guiding the setting of material parameters in finite element simulation. Hopkinson bar Proposed by the Hopkinson father and son and continuously developed by later generations, the Hopkinson rod has been widely used in the dynamic mechanical p...

AI Technical Summary

Problems solved by technology

[0004] At present, the dynamic shear test of materials mainly includes single shear and double shear experimental methods. Due to its own loading state, single shear tends to generate bending moment on the shear surface instead of pure shear state, or the fracture surface is not Shear planes lead to experimental failure

The double-shear method is currently used more for hat-shaped samples, but it is difficult to process and is mainly used in metal materials.

At present, there is no standard experimental method for testing the longitudinal shear strength of the fiber / matrix interface under dynamic load. The single-shear experiment, the mesomechanics experiment is difficult to operate and needs to be corrected later, the data dispersion is large, and the single-shear experiment based on ASTM5379 is difficult to achieve dynamic loading

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