Cable Termination Filament Alignment via Potting Phase Transition
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Solution Overview
Problem
Existing methods for creating terminations on tensile strength members, such as synthetic filament cables, often result in suboptimal filament alignment and load distribution, leading to terminations that fail below the potential breaking strength of the filaments due to random filament orientation and uneven load sharing.
Innovation Solution
A method involving the application of tension to the cable during the solidification of a potting compound, which aligns filaments and improves load distribution by exploiting the transition properties of the potting compound, allowing for controlled filament alignment and load sharing before the compound fully hardens.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If traditional spelter socket method is used to attach termination to cable, then the termination can be created, but the filament alignment becomes random and load distribution becomes uneven, causing termination strength to be below the potential breaking strength of filaments
Solution Approach 1:
The patent changes the physical state parameter of the potting compound from solid to liquid, allowing filaments to be repositioned during the liquid phase to achieve optimal alignment before the compound solidifies and locks the alignment in place
Solution Approach 2:
The patent applies preliminary tension to the cable during the liquid phase of the potting compound, before solidification occurs, to pre-align the filaments in the optimal orientation for load bearing, ensuring that the alignment is established before the compound hardens
2Strength
If traditional spelter socket method is used, then termination is created, but load distribution among filaments is uneven, leading to premature failure
Solution Approach 1:
The patent utilizes the viscosity parameter change of the potting compound during transition from liquid to solid state, allowing filaments to be positioned for optimal load distribution during the liquid phase, then locking this optimized configuration when solidified
Solution Approach 2:
The patent applies preliminary tension loads to the cable during the liquid phase to pre-distribute the load evenly among all filaments before the potting compound solidifies, ensuring that no single filament is overloaded from the start
3Manufacturing precision
If tension is applied to align filaments during potting compound solidification, then filament alignment and load distribution improve, but additional force is required during the process
Solution Approach 1:
The patent exploits the phase transition of the potting compound from liquid to solid, applying alignment forces during the liquid phase when the material is more compliant and requires less force, then allowing the solidification process to lock the alignment without requiring additional force
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 enhances the ultimate tensile strength and repeatability of the termination by improving filament alignment and load distribution, potentially exceeding the breaking strength of the cable, while minimizing the additional force required compared to the cable's ultimate tensile strength.
Implementation Method 1
A liquid potting compound is then introduced into the expanding cavity with the wires in place. The liquid potting compound transitions to a solid over time and thereby locks the wire rope into the cavity.
Implementation Method 2
At the occurrence of the defined transition, tension is applied to the cable in order to align the individual filaments roughly parallel to the cable axis.
Data Source
AI summary
A method for creating a termination by attaching some kind of fitting to the end of a tensile member such as a cable. The end fitting is provided with one or more internal cavities. Each cavity has a proximal portion that is adjacent to the area where the tensile member exits the fitting and a distal portion on its opposite end. A length of the tensile member's filaments is placed within this expanding cavity and infused with liquid potting compound. The method exploits the characteristic of a liquid potting compound as it transitions to a solid. Once the potting compound in at least a portion of the cavity has transitioned sufficiently to hold the filaments at a desired level, tension is placed on the tensile member and a small linear displacement may be imposed on the tensile member. This linear displacement tends to pull the filaments residing in the potting compound into better alignment and improve load sharing. The invention can be applied to single fittings having multiple cavities and to multiple fittings having only one cavity per fitting.