Composite Sandwich Base Panel for Indentation-Resistant ULDs
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Solution Overview
Problem
Existing unit load devices made from composite materials suffer from low compressive strength and susceptibility to plastic deformation, leading to local indentation failure and operational inefficiencies during transportation.
Innovation Solution
A composite sandwich structure incorporating high-strength microspheres within a matrix material, sandwiched between upper and lower fibre-reinforced layers, providing enhanced compressive strength and resistance to deformation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Weight of moving object
If low density core material is used to reduce weight, then weight decreases and stiffness-to-weight ratio improves, but compressive strength decreases leading to local indentation failure
Solution Approach 1:
The patent applies composite materials by combining foam core with dispersed particles (such as hollow microspheres, ceramic beads, or metal particles) to create a hybrid core structure. This composite approach allows the core to maintain low density from the foam while gaining compressive strength from the dispersed particles, thereby resolving the contradiction between weight reduction and compressive strength enhancement.
2Strength
If core stiffness is increased to prevent indentation, then compressive strength improves, but the panel cannot bend sufficiently around roller tips resulting in concentrated stress and core failure
Solution Approach 1:
The patent applies local quality by creating a core structure with non-uniform properties - the foam matrix provides flexibility and energy absorption throughout, while dispersed particles are strategically distributed to provide localized stiffness and compressive resistance where needed. This allows different regions of the core to perform different functions, balancing overall flexibility with localized strength.
3Strength
If fibre reinforcement is added to increase flexural stiffness, then resistance to bending improves, but the panel becomes more susceptible to fracture around roller tips due to excessive bending
Solution Approach 1:
The patent applies composite materials by integrating fibre reinforcement into the foam core matrix, creating a composite core structure. The fibres provide tensile strength and crack resistance, while the foam matrix maintains flexibility and energy absorption. This composite approach allows the panel to achieve sufficient flexural stiffness without becoming brittle, thereby preventing fracture around roller tips while maintaining operational flexibility.
Data Source
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AI summary
The invention relates to a composite sandwich base panel for a Unit Load Device. The panel comprises an upper surface layer comprising fibre reinforcement material, a lower surface layer comprising fibre reinforcement material, and a central core section where at least the majority comprises a plurality of particles bound in a matrix material. The upper surface layer and lower surface layer are provided with a matrix material to bind them to the central core section.