Device for realizing high strain rate pure shear of high plastic material

Abstract

The invention relates to the metal material dynamic mechanics experiment technology field and discloses a device for realizing high strain rate pure shear of a high plastic material. The device comprises a first component, a second component and a third component. The second component is installed on a transmission rod of a split Hopkinson Pressure Bar (SHPB) device. The third component and the second component are coaxially connected and are located on an incident bar of the SHPB device. The first component is clamped with the third component through the second component and is in contact with the incident bar. Experimental research of the high strain rate pure shear of the high plastic material can be realized, and a deformation process of a shearing area is shot by a high speed camera.The device is simple and reliable and is easy to implement.

Description

technical field [0001] The invention relates to the technical field of dynamic mechanics experiments of metal materials, and more specifically relates to a device for realizing high strain rate pure shearing of high plastic materials. Background technique [0002] Collision and impact are common mechanical phenomena. Whether in daily life or in the engineering field, from the anti-fall of mobile phones, the design of helmets, to the safety of car collisions, and the landing of spacecraft, they all collide with materials. closely related to impact. The scientific analysis of collision and impact requires the research method of dynamic mechanics, and the dynamic mechanical properties of materials are also an important physical property of materials. [0003] An important task in the study of material dynamic mechanical properties is to analyze the effect of strain rate on the strain-stress of material deformation through experimental data, and to summarize the material consti...

AI Technical Summary

Problems solved by technology

However, its basic structure can only meet the research of dynamic compression mechanical properties of materials. Without special test piece and fixture design, it cannot meet the requirements of high strain rate shear mechanical properties of materials.

[0004] At present, the SHPB equipment is used to realize the high strain rate shearing cap-shaped specimen method and the double-shear specimen method, but both specimens rely on the relative displacement of the two parts of the specimen, resulting in the formation of a shear zone in the shear area.

In addition, since the two parts of the test piece are made of the same material, compression deformation will inevitably occur when impacted, that is, it cannot be guaranteed that the data obtained in the experiment are all shear deformation data

It has a good effect on low plasticity materials, but it is not good for high plasticity materials, and it is inevitable to produce compression deformation in areas other than shear deformation

Therefore, for highly plastic materials, there is no feasible test piece or device for obtaining high strain rate pure shear of materials.

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