Hierarchical prediction method for composite material multi-direction lamination board by considering fiber bridge connection influence based on improved B-K criterion

A composite material and criterion technology, applied in special data processing applications, instruments, design optimization/simulation, etc., can solve the problem of inability to accurately simulate the layered expansion behavior of multi-directional laminates, and achieve shortened test workload, high precision, good consistency effect

Active Publication Date: 2017-04-26
BEIHANG UNIV +1
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Problems solved by technology

The traditional B-K criterion for judging layer expansion in bilinear CZM cannot accurately simulate the...

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  • Hierarchical prediction method for composite material multi-direction lamination board by considering fiber bridge connection influence based on improved B-K criterion
  • Hierarchical prediction method for composite material multi-direction lamination board by considering fiber bridge connection influence based on improved B-K criterion
  • Hierarchical prediction method for composite material multi-direction lamination board by considering fiber bridge connection influence based on improved B-K criterion

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Embodiment Construction

[0039] Below in conjunction with embodiment the present invention is described in further detail:

[0040] An improved B-K criterion of the present invention is used to predict the delamination of composite multi-directional laminates affected by fiber bridges. The specific implementation steps are as follows:

[0041] Step 1: The test specimen is made of unidirectional prepreg of T700 / 9511 carbon fiber / bismaleimide resin system, and the layup sequence is (+45 / -45 / 06) S / / (-45 / +45 / 06) S CFRP multi-directional laminates, in order to ensure that the displacement load is effectively applied to the mid-plane of the cantilever beam, a quick-mounted hinge was used in the DCB and MMB tests, as figure 2 Shown; According to ASTM standard D5528-01, conduct type I delamination expansion test (DCB) on CFRP multidirectional laminates, and use 4ENF test device to conduct type II delamination expansion test on CFRP multidirectional laminates, according to ASTM standard D6671M-06 Mixing ra...

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Abstract

The invention discloses a hierarchical prediction method for a composite material multi-direction lamination board by considering fiber bridge connection influence based on improved B-K criterion. By performing a static force hierarchical test on I type, II type and I/II mixed type of different mixed ratios of CFRP multi-direction lamination board, I type interlayer fracture toughness GIC (a), II type interlayer fracture toughness GIIC (a) and interlayer fracture toughness GC (a) of different mixed ratios which are changed along with hierarchical lengths are determined; least square fitting on three-dimensional data is performed to obtain a parameter <eta> in the improved B-K criterion considering the fiber bridge connection influence; next, by taking the GIC (a), the GIIC (a) and the fitting parameter <eta> as important parameters in the improved B-K criterion, a finite element model based on a cohesion unit is established, and hierarchical expansion behaviors of different mixed ratios are simulated by applying the improved criterion; and the accuracy and the applicability of the disclosed improved criterion are verified by contrast tests and numerical value results, so that hierarchical expansion behaviors of any other mixed ratios can be further predicted by applying the improved criterion, thereby greatly shortening the experimental period and lowering experimental cost.

Description

technical field [0001] The invention relates to the field of CFRP multi-directional laminate delamination expansion, in particular to a method for improving the B-K criterion to predict the delamination of composite material multi-directional laminates affected by fiber bridges, and is suitable for multi-directional composite materials widely used in aerospace and other fields. Study and Prediction of Delamination Extension Behavior towards Hybrid I / II Type Laminates. Background technique [0002] Composite materials are gradually used in the main bearing structure of aircraft because of their good mechanical properties. Among them, carbon fiber resin-based composite materials have many advantages such as high specific strength, high specific stiffness, good corrosion resistance, good fatigue performance, and performance designability, and have become a composite material mainly used in modern aircraft structures. With the mass production of medium-modulus high-strength car...

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Application Information

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IPC IPC(8): G06F17/50
CPCG06F30/23G06F30/333
Inventor 赵丽滨龚愉肖鑫张建宇
Owner BEIHANG UNIV
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