Core-Stiffened Structure Curing with Magnetorheological Fluid
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Solution Overview
Problem
Traditional core-stiffened structures using honeycomb cores with cell widths greater than 6 mm face issues with insufficient support during curing, leading to skin protrusion into cells and lateral distortion, limiting the use of large-celled honeycomb cores and requiring additional material for stabilization.
Innovation Solution
A method involving stabilization skins, soluble or thermoplastic plugs, and magnetorheological fluids within the honeycomb core cells to prevent skin protrusion and lateral movement during curing, allowing for the use of large-celled honeycomb cores and simplifying edge details.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Weight of moving object
If large-celled honeycomb core (cell width > 6 mm) is used to reduce weight, then weight of the structure is reduced, but cell walls fail to provide sufficient support during curing causing skin protrusion into cells
Solution Approach 1:
A support medium is introduced as an intermediary substance between the skin and the honeycomb core cells. This support medium fills the cells and provides temporary support during curing to prevent skin protrusion, while being removable afterward. The medium acts as a mediator that enables the use of large-celled cores without compromising manufacturing precision.
Solution Approach 2:
The physical state or properties of the support medium are changed during the curing process. The medium may transition from a liquid or semi-liquid state that provides support to a solid state, or be removed entirely after curing. This parameter change allows the medium to fulfill its support function temporarily and then be eliminated or transformed.
2Stability of the object's composition
If additional material is added to skins near the ramp to stabilize skins from lateral distortion during curing, then lateral distortion is prevented, but skin thickness exceeds structural requirements
Solution Approach 1:
The support medium acts as an intermediary that provides lateral support to the skins during curing, eliminating the need for additional skin material. By introducing this external support mechanism, the skin can maintain its required thickness without adding excess material for stabilization purposes.
Solution Approach 2:
The stabilization function is extracted from the skin material itself and transferred to a separate support medium. Instead of adding material to the skin to provide stability, the stability function is removed from the skin and performed by the removable support medium that fills the honeycomb cells.
3Stability of the object's composition
If core material is stabilized to resist lateral force during curing, then core distortion is prevented, but manufacturing complexity increases due to additional materials and processes
Solution Approach 1:
The support medium performs multiple functions simultaneously: it provides lateral support to prevent core distortion, supports the skin to prevent protrusion, and can be easily removed after curing. This multi-functionality reduces the need for separate stabilization components and processes, thereby simplifying the overall manufacturing system despite the added material.
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
Enables the effective use of large-celled honeycomb cores by inhibiting skin protrusion and reducing lateral movement, thereby improving manufacturing efficiency and structural integrity.
Implementation Method 1
introducing a magnetorheological fluid into the cells of the honeycomb core, wherein the magnetorheological fluid has a viscosity that prevents protrusion of the first skin and the second skin into the cells of the honeycomb core during curing of the core-stiffened structure
Implementation Method 2
introducing a soluble plug into the cells of the honeycomb core... removing the soluble plug from the honeycomb core
Implementation Method 3
introducing a thermoplastic plug into the cells of the honeycomb core... removing the thermoplastic plug from the honeycomb core
Data Source
AI summary
A method of making a core-stiffened structure includes the steps of providing a honeycomb core having an adhesive disposed on first and second surfaces thereof, providing a first skin and a second skin, and assembling the first skin, the second skin, and the honeycomb core to form the core-stiffened structure. The method further includes the steps of curing the core-stiffened structure and inhibiting at least one of the first skin and the second skin from protruding into at least one cell of the honeycomb core during the step of curing the core-stiffened structure.