A plate pure shear experimental loading device

Abstract

The invention discloses a plate pure shear experiment loading device, which belongs to the technical field of plate mechanical performance testing, and comprises a plate test piece, a front loading device and a rear loading device, and the plate test piece is arranged between the front loading device and the rear loading device Between the front connection and torsion testing machine, there are positioning holes for the front loading device. On the positioning surface of the front loading device, there are front upper shear force application steps and front lower shear force application steps. On the rear loading device positioning surface, there are rear The upper shear force application step and the rear lower shear force application step, the positioning pin of the loading device is provided at the center of the positioning hole of the front loading device. The present invention can obtain the precise conversion relationship between the shear stress and the loading torque through the special relative position set by the front and rear loading devices, and then obtain the precise stress-strain relationship of the plate pure shear experiment. This loading method can achieve the complete shearing effect of the plate in the pure shear state.

Description

technical field [0001] The invention relates to the technical field of plate mechanical performance testing, in particular to a plate pure shear test loading device. Background technique [0002] Plates, especially rolled plates, are widely used in national economic production, especially in automobile, aircraft and shipbuilding industries. Products with different geometric shapes are finally formed by different processing techniques, for example, the most commonly used stamping forming process. [0003] In order to avoid failure phenomena such as wrinkling and cracking during the plastic processing of the sheet, it is necessary to understand the mechanical properties of the sheet used, especially with the help of computer numerical simulation technology, to simulate the formability of the sheet during the forming process, including the formation of the sheet Limit prediction, and then rational design and optimization of forming process parameters, can effectively shorten t...

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Problems solved by technology

With the progress of shear deformation, there will be additional tensile stress phenomenon in the deformation area, and the degree of influence of tensile stress cannot be described quantitatively, which not only affects the determination of the shear stress value, but also involves the determination of the shear strain value. Accurate determination, that is, it is impossible to guarantee that the material in this area is always in a state of pure shear stress during the whole loading process, which is a problem coexisting with the existing plate shear test methods

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