Reactive Composite Bonding for Large Area Joints
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Solution Overview
Problem
Conventional reactive composite joining methods face challenges when attempting to join components over large surface areas, as maintaining uniform and simultaneous heating becomes difficult, leading to potential poor bonding and increased requirements for pressure application.
Innovation Solution
The method involves using a plurality of substantially contiguous reactive composite material sheets connected by bridging materials or structural support tabs to ensure uniform ignition and bonding across large areas, with optional fusible material sheets for enhanced bonding and pressure distribution.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If conventional reactive composite joining methods are used to join components over large surface areas, then the bonding area is increased, but the uniformity and simultaneity of heating deteriorates leading to poor bonding
Solution Approach 1:
The bonding process is divided into multiple independent heating zones, each with its own ignition point. Multiple reactive composite material sheets are arranged in a matrix pattern across the large bonding area, with each sheet having its own ignition initiation means. This segmentation allows each zone to be heated uniformly and simultaneously with adjacent zones, resolving the heating uniformity problem while maintaining large bonding area.
2Area of stationary object
If conventional reactive composite joining methods are used to join components over large surface areas, then the bonding area is increased, but the pressure application requirements increase
Solution Approach 1:
The large bonding area is divided into multiple smaller bonding zones corresponding to individual reactive composite material sheets. Each zone requires pressure application only during its local bonding process, allowing the pressure application system to work on smaller, more manageable areas sequentially or in parallel, rather than requiring uniform pressure across the entire large bonding area simultaneously.
Solution Approach 2:
The bonding process occurs in periodic stages, with each reactive composite material sheet being ignited and bonded in sequence or in controlled groups. Pressure is applied periodically to each zone as needed, rather than continuously across the entire large area, reducing the overall pressure application requirements while maintaining large bonding area capability.
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 allows for strong and uniform bonding of large area joints by ensuring simultaneous and uniform heating, minimizing thermal damage and achieving high-quality bonds across extensive surfaces.
Implementation Method 1
The RCM is ignited. A self-propagating reaction is initiated within the RCM which results in a rapid rise in temperature within the RCM. The heat released by the reaction melts the adjacent fusible material layers
Implementation Method 2
The heat released by the reaction melts the adjacent fusible material layers
Data Source
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AI summary
A method for joining component bodies (10A, 10B) of material over bonding regions of large dimensions by disposing a plurality of substantially contiguous sheets (12) of reactive composite materials between the bodies and adjacent sheets of fusible material (14A, 14B). The contiguous sheets (12) of the reactive composite material are operatively connected by an ignitable bridging material (22) so that an igniting reaction in one sheet (12) will cause an igniting reaction in the other. An application of uniform pressure and an ignition of one or more of the contiguous sheets (12) of reactive composite material causes an exothermic thermal reaction to propagate through the bonding region, fusing any adjacent sheets of fusible material (14A, 14B) and forming a bond between the component bodies (10A, 10B).