SMA Wire Oxide Coating for Composite Impact Resistance
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Solution Overview
Problem
Current composite materials with high strength-to-weight ratio and impact resistance, incorporating shape memory alloy (SMA) wires and fibers, face challenges in manufacturing efficiency and achieving optimal impact performance, inter-laminar strength, and complex structure formation.
Innovation Solution
A composite material comprising a polymer matrix with SMA wires and reinforcing fibers, where SMA wires have a dark oxide coating of at least 2000 Angstroms thickness, arranged in various configurations such as unidirectional, 2D, or 3D preforms, providing improved impact performance, inter-laminar strength, and the ability to form complex structures efficiently.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If SMA wires with thick oxide coating are used to enhance impact resistance, then impact performance is improved, but manufacturing complexity increases
Solution Approach 1:
The oxide coating is applied to SMA wires before they are embedded in the polymer matrix, allowing the coating to be formed in advance as part of the wire preparation process. This preliminary action integrates the coating step into the manufacturing sequence rather than requiring post-processing, thereby improving impact resistance while controlling manufacturing complexity
Solution Approach 2:
The patent specifies controlling the oxide coating thickness to be within 1-10 micrometers, optimizing this parameter to achieve sufficient impact resistance without excessive coating that would complicate manufacturing. By defining a specific parameter range, the invention balances performance improvement with manufacturability
2Adaptability or versatility
If complex 3D structures are formed using woven preforms, then structural capability is improved, but manufacturing efficiency decreases
Solution Approach 1:
The complex 3D structure is created by assembling multiple woven preform layers in a stacked configuration, with each layer representing a segment of the overall structure. This segmentation allows each layer to be manufactured using efficient woven preform techniques while the stacking process creates the final complex 3D geometry, balancing structural capability with manufacturing efficiency
Solution Approach 2:
The invention embeds SMA wires within the polymer matrix of woven preform layers, creating a nested structure where the wires are contained within the composite material. This nesting approach allows complex 3D structures to be formed while maintaining the manufacturing efficiency of woven preform processes
3Strength
If multiple plys are used to improve inter-laminar strength, then strength is improved, but processing complexity increases
Solution Approach 1:
Multiple preform layers with SMA wires are combined and stacked to form a multi-ply composite structure. The weaving process integrates the layers into a unified preform that can be processed together, achieving improved inter-laminar strength while managing processing complexity through the merging of layers during the preform creation stage
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 dark oxide coating enhances the composite's impact resistance and inter-laminar shear strength, allowing for the creation of complex 3D structures with improved manufacturing efficiency and multifunctional properties.
Implementation Method 1
One or more of the SMA wires in the composite materials and preforms described herein have a dark oxide coating
Data Source
Figure 1a~1b
Figure 1c
Figure 2
AI summary
A preform comprising reinforcing fibres and shape memory alloy (SMA) wires, a composite material comprising a polymer matrix with a preform embedded therein, articles comprising a composite material, methods of making preforms, composite materials and articles.