Thermoplastic Assemblies With Reinforcing Projections
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Solution Overview
Problem
Conventional thermoplastic bonding techniques in aerospace industries face limitations such as small bonding area, variable bond strength, difficulty in applying heat directly, and inability to arrest cracks, making them unsuitable for certain applications like aircraft manufacturing.
Innovation Solution
The method involves heating a joining structure with reinforcing projections and pressing a thermoplastic layer against it, transferring thermal energy to the layer, and adhering it to both the base and projections, creating a solidified bond with enhanced strength and crack resistance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If conventional thermoplastic bonding techniques are used, then the bonding process is relatively fast and cost-effective, but the bonding area is limited and bond strength is insufficient
Solution Approach 1:
The patent introduces reinforcing projections that extend in the out-of-plane direction (z-direction) from the joining structure base. These projections penetrate the thermoplastic layer and provide reinforcement in the thickness direction, transforming a 2D bonding interface into a 3D reinforced structure that significantly enhances bond strength while maintaining bonding area
2Device complexity
If conventional thermoplastic bonding techniques are used, then the process is simple, but the ability to arrest cracks is insufficient
Solution Approach 1:
The reinforcing projections are pre-formed on the joining structure base before bonding. These projections act as pre-positioned reinforcement elements that penetrate the thermoplastic layer and create a mechanically interlocked structure, providing beforehand cushioning against crack propagation and enhancing reliability
3Temperature
If conventional thermoplastic bonding techniques are used, then heating is applied to the interface region, but difficulty exists in applying heat directly to the interface region
Solution Approach 1:
The joining structure base acts as an intermediary heat transfer medium. Thermal energy is applied to the base, which then conducts and distributes heat to the thermoplastic layer through direct thermal contact. The base serves as a mediator that facilitates efficient and uniform heat transfer to the bonding interface region
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 increases bond strength, provides out-of-plane reinforcement, and effectively arrests cracks, improving the reliability and service life of thermoplastic assemblies in aircraft manufacturing.
Implementation Method 1
transferring thermal energy from the joining structure to the thermoplastic layer
Implementation Method 2
a melt region of the thermoplastic layer that is formed responsive to the transferring
Implementation Method 3
cooling the thermoplastic layer and the joining structure to solidify the melt region
Data Source
AI summary
Thermoplastic assemblies, methods of defining thermoplastic assemblies, aircraft that include the thermoplastic assemblies, and aircraft that are formed utilizing the methods are disclosed herein. The methods include heating a joining structure and pressing a thermoplastic layer against a base of the joining structure. The pressing includes transferring thermal energy from the joining structure to the thermoplastic layer and penetrating the thermoplastic layer with a plurality of reinforcing projections of the joining structure. The pressing also includes adhering the thermoplastic layer to a surface of the base and to a surface of the plurality of reinforcing projections. The thermoplastic assemblies include the thermoplastic layer and the joining structure.