Composite Cargo Bed Panels for Lightweight Puncture Resistance
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Solution Overview
Problem
Traditional truck bed and wall materials, such as steel and aluminum, are prone to punctures and damage from cargo, and composite sandwich structures with cellulosic cores are unsuitable due to moisture infiltration issues, which affect weight and operational lifetime.
Innovation Solution
A vehicle cargo construct using a composite sandwich panel material with an open area core and unidirectional fiber-reinforced sheet molding composition (SMC) surfaces, providing a lightweight, robust, and watertight solution that prevents moisture infiltration and maintains structural integrity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If steel or aluminum is used for truck bed and walls, then strength and durability are improved, but weight increases
Solution Approach 1:
The patent applies composite materials by combining a lightweight core (polystyrene beads or foam) with SMC reinforced with unidirectional fibers to create a sandwich panel structure. This composite construction achieves the strength and durability of metal while significantly reducing the weight of the cargo compartment panels.
2Weight of moving object
If aluminum is used for truck bed and walls, then weight is reduced, but resistance to punctures and damage deteriorates
Solution Approach 1:
The sandwich panel structure with SMC skin reinforced by unidirectional fibers provides high puncture and impact resistance. The rigid SMC outer layer protects the lightweight core while maintaining overall structural strength, overcoming aluminum's susceptibility to punctures.
Solution Approach 2:
The SMC material is reinforced with unidirectional fibers oriented to provide enhanced local strength and puncture resistance at critical areas, while the core material provides lightweight insulation throughout the panel structure.
3Strength
If polymeric liner is installed in cargo compartment, then resistance to punctures and scratches is improved, but weight increases and usable space decreases
Solution Approach 1:
The cargo compartment panels themselves are constructed as composite sandwich panels with SMC skin that provides the protective puncture and scratch resistance traditionally achieved by separate polymeric liners. This integrated structure eliminates the need for additional liner materials.
4Weight of moving object
If cellulosic core material is used in sandwich structure, then weight is reduced, but moisture infiltration increases
Solution Approach 1:
The patent uses a porous core material (polystyrene beads or foam) that is inherently resistant to moisture infiltration. The closed-cell structure of these materials prevents water absorption and moisture-related degradation, maintaining reliability in exposed environmental conditions.
Solution Approach 2:
The sandwich panel construction with SMC skin and sealed edges creates a protective barrier that prevents moisture infiltration into the lightweight core material, ensuring long-term durability and operational reliability.
5Ease of manufacture
If conventional sandwich structure with sealed edges is used, then manufacturing simplicity is improved, but moisture infiltration prevention deteriorates
Solution Approach 1:
The SMC skin acts as a flexible yet impermeable barrier that seals the edges and surfaces of the sandwich panel, preventing moisture infiltration while accommodating thermal expansion and contraction. The unidirectional fiber reinforcement enhances this sealing capability.
Data Source
AI summary
A vehicle cargo construct including a floor, a plurality of side wall panels extending from the floor, and an end wall panel extending from the floor between the plurality of side wall panels. The floor has an exterior surface and an oppositely opposed interior surface. Each of the plurality of side wall panels has an exterior surface and an oppositely opposed interior surface. The has an exterior surface and an oppositely opposed interior surface. Each of the floor, the plurality of side wall panels, and the end wall panel are formed of a composite sandwich panel material formed including an open area core defining a plurality of pores disposed between a backing sheet and a surface sheet formed of a sheet molding composition (SMC) reinforced with unidirectional fibers.