Composite Wall Panel with Cross-Oriented Fibers for Curved Vehicle Structures
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Solution Overview
Problem
Existing wall panels for vehicles, such as recreational vehicles and trailers, face challenges in achieving the desired level of flexibility and rigidity, particularly when curving sections like the top of a wall joining a roof panel, leading to manufacturing complexity and cost increases due to the inherent properties of materials like plywood and fiberglass/polypropylene substrates.
Innovation Solution
A composite wall panel design featuring multiple polymer resin layers with unidirectional fibers aligned parallel and perpendicular to each other, providing greater rigidity along one axis than the other, allowing for curved formations while maintaining structural integrity and aesthetic appeal.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If plywood substrates are used for wall panels, then the panels can be constructed with simple materials, but the panels become susceptible to water damage, surface inconsistencies, and difficult joint construction
Solution Approach 1:
The patent uses a composite substrate made of fiberglass mat and polymer resin instead of plywood. This composite material provides water resistance and surface consistency while maintaining ease of manufacture through a standardized lamination process. The fiberglass-polymer composite eliminates the harmful effects of plywood (water damage, knots, irregular grain) while keeping the panel constructible with common materials and methods.
2Manufacturing precision
If fiberglass/polypropylene substrate layers are used for wall panels, then the panels achieve good planar surface quality, but the panels become fairly rigid and difficult to curve
Solution Approach 1:
The patent applies different fiber orientations in different layers of the composite substrate. The first layer has fibers oriented in the longitudinal direction, while the second layer has fibers oriented in the transverse direction. This local variation in fiber orientation provides different mechanical properties in different directions, allowing the panel to be curved along one axis while maintaining surface quality and structural integrity.
Solution Approach 2:
The patent uses a layered composite structure with fiberglass mat and polymer resin, where the fiber orientation varies by layer. This composite design allows the panel to achieve both surface quality and flexibility for curving, resolving the contradiction between rigid planar surfaces and adaptability for curved applications.
3Adaptability or versatility
If additional flexible top sections are added to wall panels to enable curving, then the panels can be curved, but manufacturing complexity and costs increase
Solution Approach 1:
The patent segments the fiber reinforcement into multiple layers with different orientations. Instead of adding separate flexible sections to a rigid panel, the flexibility is built into the substrate itself through layered fibers. The first layer provides strength in one direction, while the second layer provides strength and flexibility in the perpendicular direction, eliminating the need for additional separate components.
Solution Approach 2:
The patent uses a composite substrate with strategically oriented fiber layers to achieve flexibility for curving without increasing manufacturing complexity. The fiberglass-polymer composite with cross-oriented layers provides the necessary adaptability while maintaining a simple, integrated manufacturing process.
4Strength
If multiple fiber layers with perpendicular orientations are used in composite panels, then the panels achieve greater rigidity along the preferred axis, but the manufacturing process becomes more complex
Solution Approach 1:
The patent changes the orientation parameter of fibers in different layers to achieve anisotropic rigidity. By orienting fibers in the first layer longitudinally and fibers in the second layer transversely, the panel achieves greater rigidity along the preferred axis (longitudinal direction) while maintaining manufacturability through a systematic lamination process that is not significantly more complex than standard composite manufacturing.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The composite wall panel achieves enhanced rigidity and resistance to bending along the preferred axis, enabling flexible and curved designs without increasing manufacturing complexity or costs, while providing an aesthetically pleasing surface.
Implementation Method 1
a second polymer resin layer bonded to the first polymer resin layer, a third polymer resin layer bonded to the second polymer resin layer
Data Source
AI summary
A composite wall panel for use in vehicles having a floor structure and a front wall, the composite wall panel including a first polymer resin layer having a plurality of unidirectional fibers embedded therein that are substantially parallel to a first axis, and a second polymer resin layer having a plurality of unidirectional fibers embedded therein that are substantially parallel to a second axis, the second polymer resin layer being bonded to the first polymer resin layer so that the second axis is substantially perpendicular to the first axis. The composite wall panel is disposed so that the first axis is substantially parallel to the floor structure, and the rigidity of the composite wall panel is greater along the first axis than the second axis.