Vehicle Cladding Hybrid Structure for Stiffness Without Heavy Ribs
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Solution Overview
Problem
Current methods for producing vehicle cladding components, such as those using glass fiber reinforced plastics (GRP), face challenges in achieving stiffness, resilience, and durability while minimizing resource usage and production time, especially for small quantities and high-speed applications.
Innovation Solution
A hybrid structure method involving an additively manufactured shell structure with a filling structure, where the filling structure is designed to enhance strength and rigidity, and can be made from materials like hard foam, metal, or metallic honeycomb, and is connected to the shell structure to improve shear resistance and vibration damping.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If glass fiber reinforced plastics (GRP) are used to achieve high rigidity and strength, then component stiffness and durability are improved, but production cost and complexity increase due to expensive molds required for casting and laminating
Solution Approach 1:
The cladding component is divided into two distinct parts: a shell structure produced by additive manufacturing and a filling structure inserted into the shell. This segmentation allows each part to be manufactured using different processes optimized for their specific requirements, avoiding the need for expensive molds while achieving the desired structural properties.
Solution Approach 2:
The invention combines two different materials or material systems: the additively manufactured shell structure (typically plastic) and the filling structure (which can be foam, metal, or other materials). This composite approach enables the component to achieve high stiffness and strength characteristics similar to GRP without requiring glass fiber reinforcement or laminating processes.
2Ease of manufacture
If additive manufacturing is used to reduce production complexity and mold costs, then ease of manufacture and productivity are improved, but component rigidity and strength deteriorate due to limited structural capabilities
Solution Approach 1:
The filling structure is nested inside the shell structure, with the filling inserted into the hollow interior of the additively manufactured shell. This nested configuration allows the lightweight shell to provide the outer geometry and surface features while the inner filling provides the structural rigidity and strength, combining the advantages of both manufacturing approaches.
Solution Approach 2:
By combining the additively manufactured shell with a structurally superior filling material (such as foam or metal), the component achieves enhanced rigidity and strength that would be difficult to obtain with additive manufacturing alone, while still maintaining the manufacturing ease and design flexibility of additive processes.
3Strength
If solid construction or rib structures are added to additively manufactured components to improve rigidity, then component strength is improved, but material consumption and construction time increase significantly
Solution Approach 1:
Instead of adding heavy rib structures or solid construction to the additively manufactured component, the invention extracts the structural support function and places it in a separate filling structure that is inserted into the shell. This separation allows the shell to remain lightweight and the structural support to be provided efficiently by the filling material, reducing overall material consumption.
Solution Approach 2:
The filling structure can be made from porous or cellular materials such as foam, which provide high structural rigidity and strength-to-weight ratios. These porous materials achieve the required stiffness without the excessive material consumption that would be needed with solid rib structures, as the cellular structure provides mechanical support with minimal material usage.
4Productivity
If additively manufactured cladding components are used for high-speed vehicles, then productivity and cost-effectiveness are improved, but reliability deteriorates due to insufficient strength for higher vehicle classes
Solution Approach 1:
The hybrid composite structure combines the production efficiency and design flexibility of additive manufacturing with the high strength and durability of structurally optimized filling materials. This composite approach enables additively manufactured components to meet the stringent reliability requirements of high-speed vehicles while maintaining cost-effectiveness and manufacturing productivity.
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
This approach results in a cost-effective, resource-efficient cladding component with increased structural rigidity and fire protection, enabling its use in higher-speed vehicles and applications previously unsuitable for additively manufactured plastic components.
Implementation Method 1
The shear-resistant distance between the supporting structures and the neutral fiber of a bend ensures that the area moment of inertia is significantly increased. The increase in the area moment of inertia results from the distance of the off-center cross-sectional center of gravity to the bending line multiplied by the square of the cross-sectional area of the off-center support structure.
Implementation Method 2
The damping properties of the filling structure result in improved vibration damping and fatigue strength.
Implementation Method 3
The respective layers must be connected to one another in a shear-resistant manner in order to transfer stresses.
Data Source
Figure 1
Figure 2
Figure 3~4
AI summary
A method for manufacturing a trim component (1, 1', 1", 1‴) with a hybrid structure for a vehicle is described. In this method, a shell structure (2, 2', 2"), which surrounds an interior space, is additively manufactured. At least a portion of the interior space of the shell structure (2, 2', 2") is lined with a filler structure (3, 3', 3", 3‴). A trim component (1, 1', 1", 1‴) for a vehicle is also described.