Thermoplastic Composite Panel Co-Consolidation Beyond Mold Size Limits
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Solution Overview
Problem
Current methods for manufacturing large, complex thermoplastic composite panels are limited by the size constraints of molds, making it inefficient to produce structures like aircraft pressure decks using compression molding.
Innovation Solution
The method involves connecting smaller compression molded thermoplastic subpanels edge-to-edge using a thermoplastic co-consolidation technique, where complementary machined surfaces are overlapped, heated, and pressed to form a large composite panel, allowing for the creation of smooth, continuous surfaces.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Length of stationary object
If compression molding is used to manufacture large thermoplastic composite panels, then the panels can be produced with good structural properties, but the panel size is limited by mold dimensions
Solution Approach 1:
The large panel is divided into multiple smaller subpanels that can be manufactured using standard-sized molds. These subpanels are then joined together through co-consolidation to form the complete large panel, effectively bypassing the mold size limitation while maintaining structural integrity
Solution Approach 2:
Multiple smaller subpanels are merged together through co-consolidation under heat and pressure to form a single integrated large panel. This combining process allows the final product to exceed the dimensions of individual molds used to create the subpanels
2Length of stationary object
If multiple subpanels are assembled to create large panels, then the panel size can exceed mold limitations, but the surface continuity and smoothness are compromised
Solution Approach 1:
Complementary surface features are pre-formed on the edges of subpanels during the compression molding process. These pre-formed surfaces are designed to mate together perfectly, ensuring surface continuity is achieved before the co-consolidation step
Solution Approach 2:
The physical state of the subpanel edges is changed through heating and pressure application during co-consolidation. This parameter change allows the edges to flow and merge seamlessly, eliminating visible joints and restoring surface smoothness across the entire panel
3Length of stationary object
If subpanels are joined edge-to-edge, then large panels can be fabricated from smaller components, but the joining process complexity increases
Solution Approach 1:
Rather than attempting to join entire subpanels, the joining process is localized to only the edge regions where complementary surfaces are pre-formed. This localized approach simplifies the joining process by reducing the complexity of the areas that require precise alignment and bonding
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 enables the cost-effective fabrication of large, complex composite panels with smooth surfaces, overcoming the limitations of traditional compression molding by allowing for the assembly of multiple subpanels into a single, cohesive unit.
Implementation Method 1
heat and pressure are applied to the overlapping surface constructions to co-consolidate the surface constructions in forming a large composite panel from two or more subpanels
Implementation Method 2
heat and pressure are applied to the overlapping surface constructions to co-consolidate the surface constructions in forming a large composite panel from two or more subpanels
Data Source
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AI summary
A method of constructing a large, complex composite panel (22) involves connecting smaller compression molded thermoplastic subpanels (12,14,16,18), edge to edge using a thermoplastic co-consolidation method. The edges of adjacent subpanels are given complementary surface configurations. The surface configurations are overlapped and heat and pressure are applied to the overlapping surface constructions to co-consolidate the surface constructions in forming a large, composite panel of two or more subpanels.