Method for obtaining I-type fracture toughness of three-dimensional woven composite material interface

A fracture toughness and composite material technology, applied in the direction of analyzing materials, testing material strength using stable tension/pressure, sampling, etc. Simple internal structure, single failure mode effect

Active Publication Date: 2021-11-16
HARBIN INST OF TECH
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  • Abstract
  • Description
  • Claims
  • Application Information

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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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  • Method for obtaining I-type fracture toughness of three-dimensional woven composite material interface
  • Method for obtaining I-type fracture toughness of three-dimensional woven composite material interface
  • Method for obtaining I-type fracture toughness of three-dimensional woven composite material interface

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Embodiment Construction

[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-type fracture toughness of a three-dimensional woven composite material interface, which comprises the following steps: 1, observing the arrangement structure of three-dimensional woven composite material yarns, selecting a test piece processing surface, and aiming at the requirement of an interface fracture toughness test piece, selecting a compact stretching form, the device comprises two loading holes, a notch and a crack tip notch, the crack tip notch is machined between two parallel warp yarns or weft yarns, the cutting position is selected in the middle of a single row of fiber bundles, and it is guaranteed that only one row of warp yarns or only one row of weft yarns exist in a cut test piece; A pin or other forms are inserted into the loading hole, the interface fracture toughness test piece is connected with a mechanical testing machine, and the fracture toughness of the interface fracture toughness test piece is calculated by using the mechanical testing machine according to a load displacement curve output by the testing machine. The method for testing and obtaining the I-type fracture toughness of the three-dimensional woven composite material interface is provided for the first time, and the blank in the field is filled up.

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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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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