Metal-Polymer Composite Structure With Void-Locked Mechanical Coupling
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Solution Overview
Problem
Additive manufacturing techniques face challenges with poor mechanical coupling between different materials in multi-material components, particularly between polymers and metallic substrates, leading to unpredictable physical properties and inadequate structural strength.
Innovation Solution
A multi-material structure is fabricated with an isotropic structural member and a polymeric skin, featuring open-cell and closed-cell voids with adhesive, enhancing mechanical coupling and predictable polymer deposition through tailored process parameters.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If polymeric material is 3D-printed onto metal substrate surfaces, then multi-material structures can be created with potential superior physical properties, but poor mechanical coupling and adhesion occur between the polymer skin and metal substrate
Solution Approach 1:
The patent applies preliminary action by creating open-cell voids in the metal substrate before depositing the polymeric material. This pre-prepared surface structure with voids allows the polymer to mechanically interlock and form strong bonds, resolving the adhesion problem that would otherwise occur with smooth metal surfaces.
Solution Approach 2:
The patent utilizes porous materials by incorporating open-cell voids into the metal substrate structure. These voids provide increased surface area and mechanical interlocking features that significantly improve the mechanical coupling and adhesion between the metal substrate and the polymeric skin.
2Adaptability or versatility
If polymeric materials are used in 3D-printing for multi-material structures, then design flexibility and functional integration are improved, but physical properties become highly variable and difficult to predict
Solution Approach 1:
The patent applies parameter changes by systematically controlling deposition temperature, deposition rate, and nozzle velocity during the 3D-printing process. By optimizing these parameters, the patent achieves consistent and predictable physical properties in the polymeric material while maintaining design flexibility.
3Strength
If fiber-reinforced polymers are used in additive manufacturing, then structural strength can be enhanced, but anisotropy increases making properties highly sensitive to deposition parameters
Solution Approach 1:
The patent applies parameter changes by optimizing deposition temperature and nozzle velocity specifically for fiber-reinforced polymers. These controlled parameter changes reduce the sensitivity to deposition conditions while maintaining the structural strength benefits of fiber reinforcement.
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
The structure behaves as a monolithic unit with improved mechanical coupling and controlled polymer properties, enhancing strength and rigidity compared to conventional methods.
Implementation Method 1
a skin that includes a polymetric material and is disposed on a surface of the structural member and within the at least one open-cell void
Data Source
AI summary
A multi-material structure includes: a structural member that includes an isotropic material and at least one open-cell void formed in the isotropic material; and a skin that includes a polymetric material and is disposed on a surface of the structural member and within the at least one open-cell void.