Adhesive Bonded Composite Panel and Metal Rail Assembly
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Solution Overview
Problem
Current composite vehicle body structures using fiber-reinforced materials face challenges in achieving multiple vehicle lengths without incurring huge tooling expenses and ensuring compliance with regulatory requirements, such as emergency escape windows, while also addressing durability and recyclability concerns.
Innovation Solution
A hybrid body construction using composite shear planes and lightweight metal components, where the vehicle is formed from pultruded linear modules with metal end caps, and resin-infused structures, allowing for flexible length adjustments and adherence to regulatory standards through adhesive connections that can be released by heating, facilitating disassembly and recycling.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If multiple molds are used for different body lengths, then various vehicle lengths can be produced, but tooling expenses increase hugely
Solution Approach 1:
The vehicle body is divided into multiple modular sections that can be assembled in different configurations. Each module can be produced using the same mold, and the modules are connected through adhesive bonds to form vehicles of various lengths, eliminating the need for multiple specialized molds.
Solution Approach 2:
A single mold design is created that can produce universal body modules applicable to multiple vehicle configurations. These modules serve multiple functions and can be combined in various ways to create different vehicle lengths, making the tooling investment versatile and cost-effective.
2Adaptability or versatility
If modules are ganged together to create various body lengths, then vehicle length flexibility is achieved, but the structure becomes more complex
Solution Approach 1:
Multiple body modules are merged together through adhesive bonding to form a unified vehicle structure. The adhesive bonds integrate the separate modules into a cohesive assembly that behaves as a single structural unit, reducing the perceived complexity while maintaining length flexibility.
Solution Approach 2:
The vehicle structure utilizes composite materials that provide high strength-to-weight ratios and excellent bonding characteristics. These composite materials simplify the modular assembly process by providing reliable adhesive bonds that reduce the need for additional structural complexity.
3Ease of manufacture
If adhesive attachment is used to connect body sections, then tooling costs are reduced and recyclability improves, but structural integrity must be maintained
Solution Approach 1:
The adhesive bonding process utilizes controlled parameter changes including temperature, pressure, and curing time to optimize bond strength. By carefully controlling these parameters, the adhesive joints achieve structural integrity comparable to traditional mechanical connections while maintaining cost advantages and recyclability.
Solution Approach 2:
The adhesive material undergoes phase transitions during the bonding process, transitioning from a liquid or semi-liquid state to a solid cured state. This phase change enables the adhesive to flow into bonding surfaces and then solidify to create strong, durable joints that maintain structural integrity.
4Weight of moving object
If fiber reinforced composite materials are used, then weight is reduced and corrosion resistance is improved, but manufacturing complexity increases
Solution Approach 1:
Fiber reinforcement materials are pre-prepared and pre-positioned before the resin infusion process. This preliminary action allows for optimized fiber placement and orientation to achieve maximum strength-to-weight ratio, while also simplifying the overall manufacturing process by separating material preparation from assembly operations.
Solution Approach 2:
Traditional mechanical fastening methods are replaced with resin infusion technology that chemically bonds the fiber reinforced composites together. This substitution eliminates the need for mechanical fasteners, drilling, and riveting, thereby reducing manufacturing complexity while maintaining structural integrity and weight advantages.
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 reduces tooling costs, enhances structural integrity and torsional resistance, and allows for the production of vehicles in various lengths while meeting regulatory requirements and environmental sustainability standards.
Implementation Method 1
a member connected by adhesive to the panel along the edge of the panel
Implementation Method 2
the adhesive releases its bond by heating to a release temperature which is less than a temperature which causes breakdown of the resin
Data Source
AI summary
A vehicle primarily a mass transit vehicle is formed primarily of composite materials which define a roof section and a floor section of two fiber reinforced sheets connected by an integral core and two rigid side wall sections each formed from welded steel or optionally bolted aluminum defining a series of window openings in a row along the side wall section in a ladder shape. Releasable joints of adhesive are provided between the metal rails and the edges of the composite panels where a web of the panel and the web of the rail extend across the panel at an angle to the first and second surfaces different from 90 degrees so that the web of the panel meets the flange of the panel at an angle greater than 90 degrees.