Fiber Optic Connector Strain Relief Stiffness Gradient
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Solution Overview
Problem
Fiber optic connectors face challenges in managing stress concentrations due to rapid transitions from high stiffness connector bodies to low stiffness fiber optic cables, leading to potential cable bending and weakening, which existing solutions inadequately address.
Innovation Solution
A strain relief assembly with a support and boot formed from different materials, where the support has a high stiffness and the boot has a lower stiffness, including a transition region and ribs to distribute forces effectively, reducing stress concentrations and maintaining a smooth stiffness transition.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If a rigid connector body is used to withstand forces during handling and use, then the connector can maintain structural integrity and protect the optical connection, but stress concentrations occur at the transition point where the cable meets the connector body, leading to potential cable bending beyond minimum bend radius
Solution Approach 1:
The strain relief assembly implements local quality by creating a stiffness gradient along its length, with the proximal end being more rigid to interface with the connector body and the distal end being more flexible to interface with the cable. This gradual transition in mechanical properties prevents stress concentrations while maintaining connector strength.
Solution Approach 2:
The strain relief assembly is formed from a composite material system with varying stiffness characteristics. The proximal end uses a more rigid material or structure to match the connector body, while the distal end transitions to a more flexible material to match the cable, creating a smooth mechanical transition zone that protects against cable bending.
2Reliability
If a flexible boot is used to provide stiffness transition between connector and cable, then cable bending is prevented, but stress concentrations may occur within the boot itself, weakening the structure
Solution Approach 1:
The boot portion of the strain relief assembly implements local quality by varying its stiffness along its length. The proximal end is designed with higher stiffness to interface with the rigid connector body, while the distal end has lower stiffness to interface with the flexible cable. This gradient prevents stress concentrations within the boot structure while maintaining cable protection.
Solution Approach 2:
The strain relief assembly utilizes parameter changes in material stiffness or structural geometry along its length. By gradually changing the mechanical parameters from rigid at the connector interface to flexible at the cable interface, the design prevents stress concentrations that would otherwise occur in uniform-structure boots while maintaining overall structural integrity.
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 solution effectively reduces stress concentrations and maintains cable integrity by distributing radial loads through the strain relief assembly, ensuring the cable does not bend beyond a minimum bend radius, thereby enhancing the durability and performance of fiber optic connectors.
Implementation Method 1
The support and boot are formed from respective first and second materials, with the second material being less rigid than the first material
Implementation Method 2
The second portion has a stiffness less than the first portion
Data Source
AI summary
A fiber optic connector includes a ferrule, a ferrule holder from which the ferrule extends, a housing in which the ferrule holder is received, and a connector body coupled to the housing. The connector body is configured to retain the ferrule holder within the housing. The fiber optic connector further includes a strain relief assembly comprising a support coupled to a rear portion of the connector body and a boot received over support. The support includes a first portion defining a front end of the support and a second portion defining a back end of the support, with the second portion having a stiffness less than the first portion. Additionally, the support and boot are formed from respective first and second materials, with the second material being less rigid than the first material.