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Prediction method for mixed type delamination resistance curve of composite

A layered resistance, composite material technology, applied in the direction of analyzing materials, using stable bending force to test material strength, using stable tension/pressure to test material strength, etc. and other problems, to achieve the effect of reducing workload, reducing test cost, and improving consistency

Inactive Publication Date: 2019-07-09
CHONGQING UNIV
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Problems solved by technology

[0004] A large number of existing experimental studies have shown that the loading and mixing ratio has a significant effect on the fracture toughness of composite laminates
Delamination may occur at any mixing ratio, and the experimental determination of the fracture toughness of composite materials at all mixing ratios will consume a large amount of experimental resources, and it is impossible to exhaust all possible situations through experimental means

Method used

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  • Prediction method for mixed type delamination resistance curve of composite
  • Prediction method for mixed type delamination resistance curve of composite
  • Prediction method for mixed type delamination resistance curve of composite

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Embodiment Construction

[0046] The present invention is described in further detail below in conjunction with embodiment.

[0047] A method for predicting the hybrid layered resistance curve of a composite material according to the present invention, the specific implementation steps are as follows:

[0048] Step 1: Design and fabricate specimens with +22.5° / -22.5° delamination interface according to ASTM standard D5528-13. The order of sample layup is (+22.5° / -22.5°) 6 / / (+22.5° / -22.5°) 6 . DCB, ENF and MMB experiments use the same configuration and geometric size of the sample. Specimen configuration and geometry such as figure 2 shown. Carbon fiber-reinforced composite laminates are obtained by using T800 carbon fiber / epoxy resin unidirectional tape prepregs, which are stacked according to the specified lay-up sequence and then cured.

[0049] Step 2: Refer to ASTM standards D5528-13, D7905 / D7905M-14 and D6671 / D6671M-13e1 respectively to carry out Type I, Type II and Mixed Type I / II static d...

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Abstract

The invention relates to a prediction method for a mixed type delamination resistance curve of a composite. The prediction method comprises the following steps: (1) designing and manufacturing a carbon fiber reinforced composite laminate sample; (2) respectively carrying out an I type delamination experiment, an II type delamination experiment and an I / II mixed type delamination experiment by adopting a double cantilever beam, an end part notch bending device and a mixed mode bending device; (3) determining an I type delamination resistance curve, an II type delamination resistance curve and an I / II mixed type delamination resistance curve of the sample; (4) fitting data by adopting a delamination resistance curve theoretical formula, and determining fracture toughness initial values and stable values as well as fiber bridging lengths of different delamination experiments; (5) respectively fitting the fracture toughness initial values and stable values at different mixing ratios by adopting a B-K criterion, so that criterion coefficients etainit and etaprop are obtained; and (6) establishing a mixed type delamination resistance curve prediction formula with a loading mixing ratio as an independent variable. The prediction method provided by the invention predicts a delamination resistance curve at any other mixing ratio by virtue of delamination fracture toughness testing on acarbon fiber reinforced composite laminate at a specific mixing ratio, is convenient for engineering application and can reduce experimental cost.

Description

technical field [0001] The invention relates to the technical field of prediction of fiber-reinforced composite material mixed-type delamination resistance curve, in particular to a method for predicting the delamination fracture toughness value of carbon fiber-reinforced composite material laminates at any mixing ratio. Background technique [0002] Due to their high specific strength and specific stiffness, carbon fiber reinforced composites are widely used in aerospace and other fields to reduce structural weight and improve fuel efficiency. The laminate structure is a commonly used configuration in engineering practice. Since the out-of-plane performance is much lower than the in-plane performance, delamination damage is prone to occur. The emergence and expansion of delamination damage will cause a significant decrease in structural strength and stiffness, and even lead to catastrophic accidents without warning, which seriously restrict the application of composite mate...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N3/08G01N3/20
CPCG01N3/08G01N3/20G01N2203/0019G01N2203/0023G01N2203/0067G01N2203/0682
Inventor 龚愉姚建尧刘浩张建宇胡宁
Owner CHONGQING UNIV
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