Bionic Luffa Composite Preform for Complete Resin Impregnation
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Solution Overview
Problem
Conventional composite material preforms face issues with incomplete impregnation due to tight fiber contact, leading to porosity and reduced mechanical properties, which complicates the resin impregnation process and increases production costs.
Innovation Solution
A method involving statistical analysis and modeling of the spatial structural characteristics of retinervus luffae fructus to create a bionic structure model, followed by finite element stress analysis and structural adjustments, is used to design a guiding device with grooved guide sleeves for fiber winding, ensuring complete impregnation and enhanced mechanical strength.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If three-dimensional braiding method is used to improve comprehensive mechanical property, then mechanical strength is improved, but resin impregnation becomes difficult and porosity increases
Solution Approach 1:
The preform structure is divided into multiple layers with different braid angles (±30°, ±45°, ±60°), creating a segmented architecture that balances mechanical strength with resin permeability. Each layer provides specific mechanical properties while the layered structure allows progressive resin penetration, reducing porosity and improving impregnation completeness.
2Strength
If tight contact between fibers is increased to improve mechanical property, then strength is improved, but resin impregnation rate decreases and dry fibers are generated
Solution Approach 1:
Different regions of the preform have different fiber braid angles and contact densities. The layered structure creates local variations in fiber arrangement, with outer layers having tighter contact for strength and inner layers having more open structure for resin flow. This local quality differentiation allows simultaneous achievement of high strength and complete impregnation.
3Device complexity
If conventional preform structure is used to simplify production, then manufacturing complexity is reduced, but delamination occurs under external impact
Solution Approach 1:
The preform uses a composite braiding structure combining fibers at multiple angles (±30°, ±45°, ±60°) to create a three-dimensionally braided composite material. This composite architecture provides superior resistance to delamination under external impact compared to conventional unidirectional or simple woven structures, while maintaining manufacturability through established braiding technologies.
Data Source
AI summary
A composite material having a bionic structure and a preparation method and a modeling method for the same are disclosed. A primary retinervus luffae fructus structure model is obtained by performing a modeling operation based on the mean values of the spatial structural characteristic values resulting from the statistics and analysis on spatial structural characteristic values of a retinervus luffae fructus, a finite element stress analysis is performed on the primary retinervus luffae fructus structure model, and a structural adjustment is performed on structural units according to the stressed nephogram of the primary retinervus luffae fructus structure model to obtain a retinervus luffae fructus structure model as the structure model of a composite material perform. A guiding device is created and a fiber winding order is determined based on the structure model, fibers are wound on the guiding device according to the determined fiber winding order to obtain a bionic retinervus luffae fructus structure as a composite material preform, and the obtained bionic retinervus luffae fructus structure is combined with a matrix to form the composite material. The composite material formed in a simulated manner is relatively high in tensile strength, high compression strength and high bending strength and effectively addresses the problem that the conventional composite material preform cannot be impregnated completely.