Composite Prepregs Resisting Microbuckling and Delamination
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Solution Overview
Problem
Existing composite materials face challenges in improving notched compressive properties, damage tolerance, and damage resistance, particularly in high-performance applications such as aircraft structures, where microbuckling and delamination issues are prevalent.
Innovation Solution
The use of a composite material comprising two distinct prepreg materials, one with improved resistance to microbuckling and kinkband formation, and the other with enhanced delamination resistance, achieved through the incorporation of insoluble or partially soluble particles, thermoplastics, or strengthening interleafs, which are co-cured to enhance overall performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If a single prepreg material is used, then the manufacturing process is simple, but the notched compressive properties and damage tolerance are insufficient
Solution Approach 1:
The composite material is segmented into multiple prepreg layers with different properties. Specifically, the composite comprises a first prepreg material and a second prepreg material, where the first prepreg contains reinforcing fibers and resin matrix, and the second prepreg contains reinforcing fibers, resin matrix, and interleaf material. This segmentation allows each layer to contribute specific functions: the first prepreg provides structural strength while the second prepreg with interleaf material provides delamination resistance and improved notched compressive properties.
Solution Approach 2:
The invention uses a composite of two different prepreg materials to achieve superior performance. The first prepreg material consists of reinforcing fibers impregnated with resin matrix, while the second prepreg material incorporates an interleaf material between the fibers and resin. This composite structure combines the benefits of both materials: the structural integrity of traditional prepregs with the delamination resistance and notched property enhancement provided by the interleaf-containing prepreg.
2Reliability
If traditional prepreg materials are used, then the manufacturing process is straightforward, but delamination resistance is poor
Solution Approach 1:
The interleaf material is strategically placed at specific locations within the composite structure - specifically between the reinforcing fibers and resin matrix in the second prepreg material. This local placement of specialized material provides targeted delamination resistance exactly where it is needed at the fiber-matrix interface, without complicating the overall manufacturing process. The interleaf acts as a local reinforcement layer that prevents delamination propagation.
3Strength
If microbuckling resistance is improved, then compressive strength increases, but the material becomes more complex
Solution Approach 1:
The interleaf material serves as an intermediary element between the reinforcing fibers and the resin matrix. This interleaf layer mediates the stress distribution at the fiber-matrix interface, preventing stress concentrations that lead to microbuckling. By introducing this intermediary layer, the composite achieves improved compressive strength and microbuckling resistance while maintaining a relatively simple manufacturing process, as the interleaf is integrated into the second prepreg material that is co-cured with the first prepreg.
Data Source
AI summary
A composite material comprising the following components:(a) a first prepreg material with improved resistance to microbuckling and kinkband formation; and(b) a second prepreg material with improved resistance to delamination.