Device and method for preparing fiber in-plane buckling in-situ strength test sample

Abstract

The invention discloses a device and a method for preparing a fiber in-plane buckling in-situ strength test sample and belongs to the field of preparation of composite materials. The device mainly comprises flexible silica gel plates, mobile clamps, set screws and clamp motion control mechanisms. During working, a unidirectional prepreg is laid between the upper flexible silica gel plate and the lower flexible silica gel plate in the guide rail direction, and the two silica gel plates are arranged between the left mobile clamp and the right mobile clamp; the set screws are tightened, so that the mobile clamps, the silica gel plates and the prepreg tows are tightly contacted nearby the clamping screws; the screw-out amount of adjusting screws is changed, the mobile clamps drive the silica gel plates to generate expected elastic tensile deformation, the adjusting screws are screwed out, the flexible silica gel plates are retracted, the prepreg tows generate axial compression deformation, and accordingly, in-plane buckling is produced. According to the device and the method, the preparation of the fiber in-plane buckling in-situ strength test sample with controllable deformation can be realized, and the defect that the fiber buckling test sample is difficult to acquire under non-geodesic laying according to the existing test standard is overcome.

Description

technical field [0001] The invention relates to the technical field of automatic laying and forming of composite materials, in particular to a controllable deformation fiber in-plane buckling in-situ strength test sample preparation device and a preparation method thereof. Background technique [0002] Due to its high quality, high efficiency and strong adaptability, the automatic wire laying forming process has been widely used in the automatic forming process of composite components in aerospace and other fields. [0003] In the automatic laying process, in order to make full use of the longitudinal strength of the fiber and improve the structural efficiency, the actual laying is not carried out along the geodesic line of the laying surface. However, non-geodesic laying will cause bending deformation of the prepreg, and the internal stress distribution of the prepreg is one side under tension and one side under compression. Because the tensile modulus of the fiber in the l...

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Problems solved by technology

[0004] However, according to the requirements of existing experimental standards, it is impossible to sample prepregs containing fiber buckling under non-geodesic trajectory (curved) laying. The in-situ strength is tested, and the effect of fiber buckling on the performance of the part cannot be evaluated

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