Fiber Reinforced Thermoplastic Composite Panel
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Solution Overview
Problem
Current composite body panels for vehicles lack optimal weight reduction, mechanical strength, and thermal expansion control, particularly in structural components like battery covers and doors, where traditional materials fail to balance density, tensile modulus, and coefficient of linear thermal expansion effectively.
Innovation Solution
A fiber reinforced thermoplastic composite panel is created by stitching fiber tows onto a backing substrate in a predetermined pattern, encapsulating them with a polymer layer, and consolidating under heat and pressure, using a combination of continuous fibers like carbon, glass, and thermoplastic fibers, which results in a lightweight panel with enhanced mechanical properties.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If traditional materials are used for vehicle body panels, then manufacturing process is simple, but weight reduction and mechanical strength are insufficient
Solution Approach 1:
The patent uses fiber tows (carbon, glass, or other reinforcement fibers) combined with thermoplastic resin to create a composite material structure. This composite approach achieves high tensile modulus (>5000 MPa) and strength while maintaining low density (<1.20 g/cc), directly resolving the contradiction between strength requirements and material simplicity.
2Strength
If fiber tows are stitched in complex patterns to improve mechanical properties, then tensile strength and stiffness increase, but manufacturing complexity increases
Solution Approach 1:
The patent divides the reinforcement into discrete fiber tows that are stitched at specific intervals rather than using continuous complex weaving. The stitching pattern provides structural support and fiber alignment without requiring complex manufacturing processes, achieving tensile strength ≥50 MPa while maintaining manufacturability through simplified stitching operations.
Solution Approach 2:
The stitching density and fiber tow placement are optimized locally based on structural requirements. Higher stitching density is applied in high-stress areas while maintaining lower density in less critical regions, achieving optimal tensile strength distribution without uniformly increasing manufacturing complexity across the entire panel.
3Strength
If thermoset resin is used to impregnate fibers, then mechanical strength improves, but thermal expansion control and weight reduction are compromised
Solution Approach 1:
The patent changes the resin system from thermoset to thermoplastic, utilizing the thermoplastic resin's inherent low thermal expansion coefficient and low density. This parameter change maintains mechanical strength (tensile strength ≥50 MPa, tensile modulus >5000 MPa) while achieving weight reduction (density <1.20 g/cc) and improved thermal expansion control (CLTE <30 ppm/°C).
Solution Approach 2:
The combination of reinforcement fibers with thermoplastic resin creates a composite material system where the thermoplastic matrix provides both structural support and weight reduction benefits, eliminating the need for heavier thermoset resins while maintaining or improving mechanical properties.
4Weight of moving object
If panel thickness is reduced to achieve weight reduction, then vehicle weight decreases, but mechanical strength and stiffness may be compromised
Solution Approach 1:
The fiber-reinforced thermoplastic composite structure provides high specific strength and stiffness, allowing thin panel designs (2-6 mm) to achieve the same structural performance as much thicker traditional panels. The fiber tows carry the primary structural loads while the thermoplastic matrix provides structural continuity and damage tolerance.
Solution Approach 2:
The panel incorporates curved or contoured surfaces that provide structural rigidity and strength through geometric form rather than material thickness. These curved surfaces act as load-bearing elements, distributing stresses efficiently and maintaining structural integrity at reduced thickness levels.
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 solution achieves a density less than 1.20 g/cc, a tensile modulus greater than 5000 MPa, and a coefficient of linear thermal expansion less than 30 ppm/°C, providing improved strength and thermal stability while maintaining a thickness between 2 mm and 6 mm, suitable for various vehicle components.
Implementation Method 1
stitched to a first surface of the backing substrate in a predetermined pattern to form a fiber reinforced insert
Implementation Method 2
consolidated using at least one of heat and pressure prior to encapsulating
Implementation Method 3
coefficient of linear thermal expansion (CLTE) in at least one direction is less than 30 ppm/° C.
Implementation Method 4
A first polymer layer encapsulates the first surface of the backing substrate and the first plurality of fiber tows
Data Source
AI summary
A composite panel includes a backing substrate and a first plurality of fiber tows. The first plurality of fiber tows is stitched to a first surface of the backing substrate in a predetermined pattern to form a fiber reinforced insert. A first polymer layer encapsulates the first surface of the backing substrate and the first plurality of fiber tows.