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Composite interlaminar shear performance testing method

A composite material layer and testing method technology, applied in the field of composite materials, can solve the problems of interlaminar shear and tension-compression mixed failure, difficulty in accurately obtaining interlaminar shear properties, weak interlaminar properties of test data, etc. The effect of processing links, cost reduction and convenient operation

Active Publication Date: 2012-09-19
XIAN AIRCRAFT DESIGN INST OF AVIATION IND OF CHINA
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Problems solved by technology

[0005] The processing accuracy of the specimen in the double-notch specimen compression test method is extremely high. Since the double-notch front edge cannot be on the same interlayer plane at the same time in practice, the test data is the weakest interlayer performance between multiple layers, and it is easy to Interlaminar shear and tension-compression mixed failure modes appear, and it is difficult to accurately obtain the interlaminar shear performance of the specified interlayer

Method used

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  • Composite interlaminar shear performance testing method
  • Composite interlaminar shear performance testing method
  • Composite interlaminar shear performance testing method

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Embodiment Construction

[0023] The following structural drawings describe the present invention in detail. The test method includes the following two steps:

[0024] (1) Preparation of test pieces

[0025] Specimen 1 is a block with a boss 2 in the middle. Firstly, it is laid continuously, and then the boss base 3 is laid. For the laying of layers, and at the 5 shoulders on both sides of the boss 2, first lay a layer of film 6 for release, and then continuously lay the 90-degree layer 7 on the film 6 for release, and the 90-degree layer 7 and the part of the boss 2 The laying layers are spliced ​​in parallel until the laying is completed; the laid block is formed, and after forming, the film 6 for demoulding on both sides of the boss 2 and the continuous laying part above 90 degrees are spliced ​​along the film 6 for demoulding and splicing The interface 8 is peeled off to form a boss-type test piece 1;

[0026] (2) Preparation of test device

[0027] The test device consists of two L-shaped comp...

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Abstract

The invention belongs to the technical field of composites and relates to a composite interlaminar shear performance testing method. The testing method comprises two steps, namely the preparation of a test piece and the preparation of a testing device. In the step of preparing the test piece in the testing method disclosed by the invention, a common ply splicing and laying technology of a composite laminated plate is utilized, thus the operation is convenient, and the precision is high. When the manufacturing of the composite laminated plate is completed, the manufacturing of the test piece is completed, thus a fine processing link of the test piece is reduced, and the cost can be reduced by above 70%. The interlaminar shear testing method is simple to operate; and by adopting the interlaminar shear testing method, the damages of the test piece between designated tested layers can be ensured, the generation of pure shear damages between the tested layers can be ensured, the composite interlaminar shear performance can be precisely tested, and the testing method is suitable for composite laminated structures in various thicknesses.

Description

Technical field: [0001] The invention belongs to the technical field of composite materials, and relates to a method for testing the interlayer shear performance of composite materials. Background technique [0002] Composite materials have high specific strength and specific modulus in the plane, and have been widely used in the design and manufacture of aircraft structures. However, the interlayer performance of composite materials is low, and it is a site prone to damage. Therefore, its interlayer strength performance must be determined for the necessary strength assessment of structural details. [0003] At present, the methods for measuring interlaminar properties of composite materials include short beam shear test method and double notch specimen compression test method. [0004] The short beam shear test method is relatively simple, but the short beam shear test data is the average performance of each layer, and the performance of the specified interlayer cannot be...

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Application Information

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IPC IPC(8): G01N3/24G01N1/28
Inventor 刘红霞熊伟王斌团张兆斌
Owner XIAN AIRCRAFT DESIGN INST OF AVIATION IND OF CHINA
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