Pure shear test loading device for boards

Abstract

The invention discloses a pure shear test loading device for boards, and belongs to the technical field of board mechanics performance testing. The device comprises a board test-piece, a front loadingdevice and a rear loading device; the board test-piece is arranged between the front loading device and the rear loading device; a front loading device locating hole is formed in a front connection torsion testing machine area; a front upper shear force applying step and a front lower shear force applying step are arranged on the locating plane of the front loading device; a rear upper shear force applying step and a rear lower shear force applying step are arranged on the locating plane of the rear loading device; and a loading device locating pin is arranged at the center position in the front loading device locating hole. According to the device provided by the invention, via the special relative positions set by the front and rear loading devices, the accurate conversion relation between the shear stress and the load torque can be acquired, and thus the accurate board pure shear test stress-strain relation can be acquired. According to the loading mode, the board can be completelysheared under the pure shear condition.

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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