Vehicle Load Compartment Panel Composite Layer Impact Resistance
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Commercial vehicle box body panels with foamed plastic core layers and metal cover layers are prone to dents and local damage from collisions, affecting their stability and appearance.
Innovation Solution
A composite layer made of unfoamed polyurethane material with chopped fiberglass is applied between the core and cover layers, enhancing strength and impact resistance while minimizing dent formation and distributing forces to prevent core layer damage, and can be strategically applied in areas of high mechanical stress.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If a core layer made of foamed plastic is used to reduce thermal conductivity and weight, then thermal insulation and weight reduction are improved, but the panel's resistance to collisions and impact forces deteriorates
Solution Approach 1:
The patent applies a composite layer made of thermoplastic material and reinforcing fibers (such as glass fibers) between the face layer and the foamed plastic core layer. This composite structure combines the lightweight and insulating properties of the foamed plastic with the high strength and impact resistance of the thermoplastic-fiber composite, thereby resolving the contradiction between thermal insulation and collision resistance.
2Strength
If the composite layer is made thicker to increase strength and impact resistance, then collision resistance is improved, but the overall thermal transmittance of the panel increases
Solution Approach 1:
The composite layer is strategically positioned only at the interface between the face layer and the core layer, where it is most needed for impact resistance. This localized application provides maximum structural reinforcement at the critical impact zone while minimizing the overall thickness and thermal transmittance of the panel, thus resolving the contradiction between local strength enhancement and global thermal insulation.
3Strength
If additional layers are added to increase strength, then impact resistance is improved, but the panel construction complexity increases
Solution Approach 1:
The patent merges the reinforcing layer and the bonding layer into a single composite layer made of thermoplastic material and reinforcing fibers. This integrated structure performs multiple functions simultaneously: it reinforces the panel against impact, bonds the face layer to the core layer, and provides a smooth transition between layers. This merging approach reduces construction complexity compared to using separate reinforcing and bonding layers.
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 layer increases the panel's resistance to collisions without compromising thermal insulation, maintaining the core layer's structural integrity and reducing the appearance of damage, while allowing for cost-effective production with a thin layer thickness.
Implementation Method 1
the composite layer distributes the forces over a large area to the core layer, so that the porous structure of the core layer is not damaged
Implementation Method 2
the composite layer and the foamed or to-be-foamed plastic of the core layer can be applied wet-on-wet and then cured
Data Source
Figure 1~2
Figure 3~5
AI summary
The panel (1) has two top layers (3,4) and a core layer (2) arranged between the two top layers. One of the top layers is formed from a sheet metal. The core layer is formed from a foamed plastic. The synthetic material is distributed as a disperse phase evenly in a matrix of the plastic as continuous phase. The unfoamed plastic of a connecting layer (5) is formed from a polyurethane material. The glass fiber material is the glass fiber chaff.