Mooring Loop Controlled Failure Point for Visual Force Indication
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Solution Overview
Problem
Mooring loops used to secure ships to bollards or other fixed structures often fail catastrophically when overloaded, leading to damage and potential personal injury, as they lack effective mechanisms for controlled elongation and visual indication of excessive force application before failure.
Innovation Solution
A mooring loop design featuring a continuous rope segment with an inner core and outer jacket, incorporating controlled failure points where the inner core is severed, allowing the outer jacket to elongate visibly under excessive tension, providing a controlled and observable failure mechanism to prevent catastrophic breakage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If a mooring loop is designed with high strength to prevent breaking, then the breaking strength is improved, but the ability to provide visual indication of excessive force before failure deteriorates
Solution Approach 1:
The mooring loop is segmented into different functional zones: a reinforced high-strength section for load bearing, and a controlled failure section with severed core fibers that provides visual indication. This segmentation allows the loop to simultaneously achieve high overall strength while incorporating a visible warning mechanism that activates before catastrophic failure.
Solution Approach 2:
Different sections of the mooring loop have different structural properties. The controlled failure section has severed core fibers creating a local weakness that yields under excessive force, while the rest of the loop maintains full strength. This local quality change enables the warning function without compromising overall structural integrity.
2Strength
If a mooring loop uses a continuous core for maximum strength, then the strength is improved, but the controlled elongation and visual indication capability deteriorates
Solution Approach 1:
The core fibers are segmented or severed at specific locations to create controlled failure points. This segmentation allows the outer jacket to elongate independently in a controlled manner when excessive force is applied, providing visible warning before complete failure, while the overall rope structure maintains high strength through the continuous outer jacket and unreinforced sections.
Solution Approach 2:
The core structure is modified locally at specific sections to create controlled failure zones with severed fibers, while the remainder of the core remains continuous and load-bearing. This local quality change enables controlled elongation in specific zones without compromising the overall strength of the mooring loop.
3Loss of information
If the inner core is completely severed to create controlled failure points, then the visual indication capability is improved, but the overall strength of the rope deteriorates
Solution Approach 1:
The core fibers are severed only in specific localized sections rather than completely throughout. This creates controlled failure points that provide visual indication when the outer jacket elongates under excessive force, while the unreinforced sections with continuous core maintain sufficient strength to prevent premature failure during normal operation.
Solution Approach 2:
The core is partially segmented at controlled failure points rather than being completely severed. This partial segmentation creates localized weaknesses that yield under excessive load to provide warning, while the overall continuous structure maintains adequate strength for normal mooring operations.
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 design enables the mooring loop to elongate and provide a visual indication of excessive force application, allowing for timely intervention to prevent separation failure, thereby reducing the risk of damage and injury while ensuring safe operation.
Implementation Method 1
the outer jacket is located at the controlled failure point... enable the rope segment to permanently elongate in response to an applied tension force at a level above a working range
Data Source
AI summary
A mooring loop is operative to secure a movable device such as a ship in connection with a bollard or other fixed structure. The exemplary mooring loop includes a continuous rope segment that includes at least one coil or a plurality of coils. The rope segment defining the mooring loop includes an inner core surrounded by an outer jacket. A plurality of controlled failure points are included in the rope segment. The failure points enable the rope segment to permanently elongate in response to an applied tension force at a level above a working range, which elongation is visibly observable. The controlled failure point is defined between segmented ends of a severed inner core such that only the outer jacket is located at the controlled failure point.