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A Method for Obtaining the I-Mode Fracture Toughness of the Interface of Three-dimensional Woven Composites

A technology of fracture toughness and composite materials, which is applied in the direction of analyzing materials, applying stable tension/pressure to test material strength, sampling, etc., can solve the problems of no reasonable method for measuring the I-mode fracture toughness of three-dimensional woven composite materials, and achieve The effect of simple internal structure and single failure mode

Active Publication Date: 2022-05-17
HARBIN INST OF TECH
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Problems solved by technology

[0004] In short, there is currently no reasonable way to measure the Mode I fracture toughness at the interface of 3D woven composites

Method used

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  • A Method for Obtaining the I-Mode Fracture Toughness of the Interface of Three-dimensional Woven Composites
  • A Method for Obtaining the I-Mode Fracture Toughness of the Interface of Three-dimensional Woven Composites
  • A Method for Obtaining the I-Mode Fracture Toughness of the Interface of Three-dimensional Woven Composites

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[0026] The technical solution of the present invention will be further described below in conjunction with the accompanying drawings, but it is not limited thereto. Any modification or equivalent replacement of the technical solution of the present invention without departing from the spirit and scope of the technical solution of the present invention should be covered by the present invention. within the scope of protection.

[0027] The research object of the present invention is a typical three-dimensional woven composite material internal yarn weaving structure, and its structure is as follows: figure 1 As shown, warp yarn 1 and weft yarn 2 are included, and there is spatial interlocking between the two yarns. Among them, the warp yarn 1 fluctuates greatly, while the weft yarn 2 is relatively straight.

[0028] figure 2 is the cutting position of the specimen, image 3 is the incision position of the crack tip. For the convenience of expression, the warp direction is ...

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Abstract

The invention discloses a method for obtaining the I-mode fracture toughness of the interface of a three-dimensional woven composite material. The steps of the method are as follows: 1. Observing the arrangement structure of the yarns of the three-dimensional woven composite material, selecting a processing surface of a test piece, and aiming at interface fracture For the requirements of the toughness test piece, choose a compact tensile form, including two loading holes, a notch and a crack tip incision. The crack tip incision is processed in the middle of two parallel warp or weft yarns, and the cutting position is selected in the middle of a single row of fiber bundles , to ensure that there is only one row of warp yarns or only one row of weft yarns inside the cut test piece; 2. Use pins or other forms to insert into the loading hole, connect the interface fracture toughness test piece with the mechanical testing machine, and use the mechanical testing machine to test the interface fracture toughness. For the test piece, calculate the fracture toughness of the interface fracture toughness test piece according to the load-displacement curve output by the testing machine. The present invention firstly proposes a method for obtaining the mode I fracture toughness test of the interface of the three-dimensional woven composite material, which fills up the gap in this field.

Description

technical field [0001] The invention belongs to the field of performance testing of composite materials, and relates to a method for testing the I-mode fracture toughness of a three-dimensional woven composite material interface. Background technique [0002] Recent studies have shown that interfacial debonding is a very important failure mode when three-dimensional woven composites are subjected to out-of-plane loads, especially out-of-plane tensile and out-of-plane shear loads. Therefore, parameters related to this failure mode, especially fracture toughness, are very important for the study of material mechanical properties and related numerical simulations. However, there is currently no reliable way to obtain these parameters. [0003] The interface of three-dimensional woven composites generally refers to the junction of fiber bundles / fiber bundles (or fiber bundles / matrix), and its performance can be regarded as the comprehensive effect of the microscopic interface (...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01N3/08G01N1/28
CPCG01N3/08G01N1/286G01N2001/2873G01N2203/0017G01N2203/0067G01N2203/0298
Inventor 孙锐坚果立成宗庆松郝留磊张莉李志兴
Owner HARBIN INST OF TECH
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