Clamping device suitable for testing shear property of fiber reinforcement bodies and prepregs thereof

Abstract

The present invention belongs to the field of material property testing, and particularly relates to a clamping device suitable for testing the shear property of fiber reinforcement bodies and prepregs thereof. The clamping device comprises a main body frame, a clamping unit, a tensile force loading unit and a sensor, wherein the main body frame comprises four connecting rods, the four connectingrods are connected to form a square, the main body frame is provided with a connecting member for connecting to an external testing machine and a position limiting rod for limiting the angle of the connecting rod of a right angle, the clamping unit comprises a front clamping part and a rear clamping part, the front clamping part is used for pre-clamping and ensuring the parallel states respectively between the warp direction and the weft direction of a to-be-clamped object and the adjacent connecting rods, the rear clamping part further fixes the to-be-clamped object after the tensile force loading unit loads force, thee tensile force loading unit is used for respectively applying tensile force along the warp direction and the weft direction, and the sensor is used for detecting the loadedtensile force. With the clamping device of the present invention, the structure is stable, the measuring process is not slippery, and the large angle shear deformation can be tested.

Description

technical field [0001] The invention belongs to the field of material performance testing, and more specifically relates to a fixture suitable for testing the shearing performance of a fiber reinforced body and its prepreg. Background technique [0002] At present, braided fiber reinforced composites have been widely used in aerospace, national defense, automobile and wind power fields due to their advantages of high specific strength, high specific stiffness and strong designability. For the forming of braided fiber reinforced composites, whether it is the laying process of fiber preforms in resin transfer molding (RTM) molding of thermosetting resin matrix composites or the thermocompression molding process of thermoplastic resin matrix composites, braided fiber reinforced The shear performance of the body and its prepreg is one of the important molding factors that affect the quality of the final product. Domestic researchers of woven fiber composites usually use off-axis...

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Problems solved by technology

[0004] In view of the above defects or improvement needs of the prior art, the present invention provides a fixture suitable for testing the shear performance of fiber reinforced bodies and their prepregs, through the structure of the main frame, clamping unit and tensile loading unit of key components The purpose of the design and position layout is to make the object to be clamped be clamped while keeping the warp direction and weft direction vertical, and at the same time apply tension in the warp and weft direction to the object to be clamped in real time through the tension loading unit, thereby solving the problem of shearing. Technical problems of braided fiber reinforcement and its prepreg not easy to fix, clamping along the warp and weft direction and loading tension in the shear test

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