Method for Obtaining Mode I Fracture Toughness in Fiber Bundles of Three-dimensional Woven Composite Materials
A composite material fiber and fracture toughness technology, which is applied in the direction of analyzing materials, using stable tension/pressure to test material strength, sampling, etc., can solve the problems of unreasonable and measuring three-dimensional woven composite fiber bundles, and achieve simple internal structure effect
Active Publication Date: 2022-05-17
HARBIN INST OF TECH
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[0004] In short, there is currently no reasonable way to measure the Mode I fracture toughness within fiber bundles of 3D woven composites
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[0019] 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.
[0020] 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.
[0021] 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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The invention discloses a method for obtaining the I-mode fracture toughness in a fiber bundle 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 and selecting a processing surface of a test piece, aiming at The fracture toughness test piece in the fiber bundle is selected in the form of compact tension, including two loading holes, a notch and a crack tip incision. The crack tip incision is processed in a relatively straight yarn, and the cutting position is selected in a single row of fiber bundles In the middle, 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 test piece with the mechanical testing machine, and use the mechanical testing machine to break the fiber bundle. The toughness test piece is loaded, and the fracture toughness of the fracture toughness test piece in the fiber bundle is calculated according to the load-displacement curve output by the testing machine. The invention firstly proposes a test method for obtaining the I-type fracture toughness in the fiber bundle 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-type fracture toughness in fiber bundles of three-dimensional woven composite materials. Background technique [0002] Recent studies have shown that the transverse failure of fiber bundles 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 mode I fracture toughness of fiber bundle transverse failure is difficult to obtain through experiments, and few scholars have studied it directly. Using the mode I fracture toughness of laminated composites ...
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IPC IPC(8): G01N3/08G01N1/28
CPCG01N3/08G01N1/286G01N2001/2873G01N2203/0017G01N2203/0067G01N2203/0298
Inventor 孙锐坚李志兴果立成郝留磊张莉宗庆松
Owner HARBIN INST OF TECH