Composite Panel Reinforcing Pin Angles for Shear Resistance
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Solution Overview
Problem
Composite panels used in aircraft structures face challenges in providing optimal mechanical resistance to shear and compression loads, as existing technologies do not achieve an optimal balance between shear resistance and density.
Innovation Solution
A composite panel design featuring a core between two skins with a specific arrangement of inclined and orthogonal reinforcing pins, where at least six pins form an elementary pattern with inclined pins at 30-40 degrees and orthogonal pins at 80-100 degrees, optimizing shear and compression resistance while minimizing weight.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If reinforcing pins are added to improve shear resistance, then mechanical strength increases, but density and weight increase
Solution Approach 1:
The patent changes the orientation parameter of reinforcing pins from conventional vertical or random arrangements to specific inclined angles (30-40 degrees) and orthogonal angles (80-100 degrees). This parameter optimization allows the pins to more effectively resist shear forces through geometric advantage while maintaining lower density by reducing the total number of pins required
Solution Approach 2:
The patent creates a composite reinforcement system combining two types of pins with different orientations (inclined pins at 30-40 degrees and orthogonal pins at 80-100 degrees) working together within the core. This composite arrangement synergistically improves shear resistance while controlling overall density through optimized pin distribution and spacing
2Strength
If more reinforcing pins are used to increase compression resistance, then mechanical strength improves, but device complexity increases
Solution Approach 1:
The patent segments the reinforcement function into two distinct pin types with specific orientations: inclined pins (30-40 degrees) that provide compression resistance and orthogonal pins (80-100 degrees) that provide shear resistance. This segmentation allows each pin type to be optimized for its specific function, reducing the total number of pins needed while maintaining comprehensive mechanical protection
Solution Approach 2:
The inclined pins serve dual functions by providing both compression resistance through their angled orientation and contributing to shear resistance when combined with orthogonal pins. This multi-functionality reduces the need for separate pin types, simplifying the overall structure while maintaining comprehensive strength properties
Data Source
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AI summary
The invention relates to a composite panel comprising a first skin, a second skin, a core arranged between the first skin and the second skin, a plurality of reinforcing pins (11, 12) connected by a first end to the first skin and connected by a second end to the second skin, in which a plurality of inclined reinforcing pins (12) form an angle comprised between 25 degrees and 45 degrees with the first skin and/or the second skin.