Fiber-Reinforced Composite Panel Bonding for Vehicle Roof Stiffness

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Solution Overview

Problem

Transparent glass panels used in vehicles provide limited structural support and require thick, low stiffness adhesives for vibration isolation, which increases weight and adhesive volume.

Innovation Solution

A composite panel with reinforcing fibers encapsulated in resin is bonded to an interface surface using high stiffness adhesive and/or fasteners, providing structural rigidity and reducing adhesive volume.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If a thick layer of low stiffness adhesive is used to attach transparent glass panels, then vibration isolation is provided and loads transferred to the glass panels are limited, but the structural support capability is reduced and the attachment rigidity is insufficient

Engineering Contradiction:

Improvevibration isolationVSAvoidstructural support capability

Core Design Contradiction:

ReliabilityVSStrength

Solution Approach 1:

The patent uses fiber-reinforced composite panels (combining glass fibers, carbon fibers, or basalt fibers with resin) instead of plain glass panels. This composite structure provides both the necessary structural strength and controlled flexibility to maintain vibration isolation while improving load-bearing capability.

Inventive Principle:

Principle #40Composite materials

Solution Approach 2:

The patent changes the stiffness parameter of the adhesive from low stiffness (for vibration isolation) to high stiffness (for rigid attachment). This parameter change allows the adhesive to provide both vibration isolation and structural support simultaneously, resolving the contradiction between reliability and strength.

Inventive Principle:

Principle #35Parameter changes

2Illumination intensity

If transparent glass panels are used, then transparency is provided, but structural support capability is limited

Engineering Contradiction:

ImprovetransparencyVSAvoidstructural support capability

Core Design Contradiction:

Illumination intensityVSStrength

Solution Approach 1:

The patent creates a composite structure combining transparent resin matrix with reinforcing fibers (glass, carbon, or basalt). This composite material maintains the transparency of the panel while the fiber reinforcement dramatically improves the structural support capability, resolving the contradiction between illumination transmission and strength.

Inventive Principle:

Principle #40Composite materials

Solution Approach 2:

The patent applies fiber reinforcement selectively within the transparent panel structure. The resin matrix maintains transparency while the embedded fibers provide localized structural support where needed, allowing different regions of the panel to have different functional qualities.

Inventive Principle:

Principle #3Local quality

3Strength

If high stiffness adhesive is used to rigidly attach the composite panel, then structural support is improved, but vibration isolation is reduced

Engineering Contradiction:

Improvestructural supportVSAvoidvibration isolation

Core Design Contradiction:

StrengthVSReliability

Solution Approach 1:

The fiber-reinforced composite panel itself provides vibration damping through the interaction between fibers and resin, allowing the use of high stiffness adhesive for rigid attachment without sacrificing vibration isolation. The composite structure absorbs vibrations internally while maintaining strong structural support.

Inventive Principle:

Principle #40Composite materials

Solution Approach 2:

The high stiffness adhesive acts as an intermediary that provides rigid structural attachment, while the fiber-reinforced composite panel serves as a vibration-damping intermediary between the adhesive and the external environment, isolating vibrations while maintaining structural integrity.

Inventive Principle:

Principle #24Intermediary (Mediator)

4Ease of manufacture

If plain glass panels are used, then manufacturing is simple, but structural reinforcement is insufficient

Engineering Contradiction:

Improvemanufacturing simplicityVSAvoidstructural reinforcement

Core Design Contradiction:

Ease of manufactureVSStrength

Solution Approach 1:

The patent uses fiber-reinforced composite panels that combine the manufacturing simplicity of glass panel production with the structural reinforcement of composite materials. The fibers are embedded in the resin matrix during the molding process, providing structural strength without significantly complicating the manufacturing workflow.

Inventive Principle:

Principle #40Composite materials

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 panel enhances torsional stiffness, improves roof crush performance, and reduces vibration response while minimizing adhesive usage.

Implementation Method 1

An adhesive affixes the composite panel to the interface surface of the body structure. The adhesive has a stiffness in a range from 50 MPa to 2 GPa.

Methodology Applied

Scientific EffectAdhesion: Adhesive

Data Source

PatentUS12612118B2Structural, fiber reinforced composite panel rigidly attached to an interface surface

Publication Date: 2026.04.28 GM GLOBAL TECHNOLOGY OPERATIONS LLC

AI summary

A structural component comprises a body structure defining an interface surface. A composite panel comprises a plurality of reinforcing fibers encapsulated in a resin. An adhesive affixes the composite panel to the interface surface of the body structure. The adhesive has a stiffness in a range from 50 MPa to 2 GPa.