Multi-Material Fiber Layout for Neutral-Axis Device Integration
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Solution Overview
Problem
Conventional multi-material fibers used in textiles are limited in their ability to withstand mechanical and environmental stresses such as bending, stretching, and machine washing, and the incorporation of semiconductor devices during preform fabrication restricts control over device location, density, and cladding materials, leading to lower yields and reduced reliability.
Innovation Solution
A method of manufacturing multi-material fibers involves positioning electrically-connectable devices and conductors within a preform material, forming metallurgical bonds during the drawing process to ensure electrical communication, and strategically locating these components along the neutral axis to enhance mechanical stability and reliability, while also controlling the aspect ratio and using overcoating and support wires to improve durability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If semiconductor devices are incorporated during preform fabrication, then multi-material fibers can be produced with functional devices, but control over device location, density, and cladding materials is restricted
Solution Approach 1:
The preform is divided into distinct regions: a core region containing pockets for semiconductor devices and conduits for electrical conductors, and a cladding region. This segmentation allows independent positioning and control of devices and conductors within their respective zones, improving location control without overwhelming fabrication complexity.
Solution Approach 2:
Pockets and conduits are pre-formed in the preform material before device insertion. Electrical conductors are positioned in conduits and devices in pockets during preform fabrication, establishing their locations in advance. This preliminary action simplifies subsequent processing and ensures precise device location control.
2Reliability
If conventional multi-material fibers are used, then textile applications are possible, but they cannot withstand mechanical and environmental stresses like bending, stretching, and machine washing
Solution Approach 1:
The fiber structure assigns different properties to different regions: the core provides mechanical strength and stability with the neutral axis positioned to minimize stress on electrical connections, while the cladding provides environmental protection and flexibility. This local differentiation allows the fiber to withstand bending, stretching, and washing while maintaining electrical functionality.
Solution Approach 2:
The fiber combines multiple materials with complementary properties: a mechanically robust core material (e.g., polymer or glass) and a protective cladding material. This composite structure provides both the strength needed to withstand mechanical stresses and the flexibility required for textile applications.
3Reliability
If electrical conductors are positioned away from the neutral axis, then electrical connection is achieved, but mechanical stability under bending and stretching is reduced
Solution Approach 1:
The electrical conductors are positioned along the neutral axis of the fiber cross-section, where longitudinal stress is minimal during bending. This positioning creates an equipotential condition for electrical connections, exposing them to uniform, low-stress conditions that maintain both electrical stability and mechanical durability.
4Ease of manufacture
If standard thermoplastics and cross-sectional architectures are used, then manufacturing is simplified, but fibers lack adequate reliability for bend testing and machine washing
Solution Approach 1:
The fiber design modifies key parameters: the cross-sectional architecture is changed to position the neutral axis centrally with pockets and conduits strategically located, and the aspect ratio is optimized. These parameter changes maintain manufacturability through standard extrusion while dramatically improving reliability for bend testing and machine washing.
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 method results in multi-material fibers that are more robust and reliable, capable of surviving typical textile use cases with improved mechanical stability and resistance to environmental factors, enabling effective integration into textiles for communication applications like free space optical communication.
Implementation Method 1
drawing the multi-material fiber by causing the preform material to flow
Implementation Method 2
a metallurgical bond may be formed between the first electrical conductor and the first electrode while drawing the multi-material fiber
Data Source
AI summary
Methods of manufacturing multi-material fibers having one or more electrically-connectable devices disposed therein are described. In certain instances, the methods include the steps of: positioning the electrically-connectable device(s) within a corresponding pocket provided in a preform material; positioning a first electrical conductor longitudinally within a first conduit provided in the preform material; and drawing the multi-material fiber by causing the preform material to flow, such that the first electrical conductor extends within the multi-material fiber along a longitudinal axis thereof and makes an electrical contact with a first electrode located on each electrically-connectable device. A metallurgical bond may be formed between the first electrical conductor and the first electrode while drawing the multi-material fiber and/or, after drawing the multi-material fiber, the first electrical conductor may be located substantially along a neutral axis of the multi-material fiber.