Portable Polymer Tester for Cable Aging via Indentation Recovery
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Solution Overview
Problem
Current polymer cable aging monitoring techniques are limited by their destructive nature, inability to be portable, and lack of flexibility in measuring parameters beyond stiffness, which hinders effective in-situ assessment and prediction of cable degradation.
Innovation Solution
A portable polymer tester that measures visco-elastic properties by indenting polymer materials, including cable insulation and jackets, to assess stiffness and deformation recovery time, providing non-destructive and adaptable characterization of polymer aging.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If traditional destructive testing methods are used to assess polymer aging, then measurement precision is improved, but the component must be destroyed and cannot be used again
Solution Approach 1:
The patent replaces traditional destructive mechanical testing with non-destructive indentation testing. A small indenter applies controlled force to create a localized impression on the polymer surface, measuring viscoelastic properties without destroying the component. This substitution allows repeated measurements on the same component over time, enabling continuous aging monitoring while preserving component functionality.
Solution Approach 2:
The patent uses a localized indentation approach that creates a small affected zone in the polymer material. This localized testing method is analogous to using porous or minimal-invasive approaches, where the test affects only a small portion of the material while leaving the bulk intact. The indentation creates a controlled local deformation that reveals aging properties without compromising overall component integrity.
2Measurement precision
If laboratory-based testing equipment is used for polymer characterization, then measurement precision is improved, but portability deteriorates
Solution Approach 1:
The patent divides the traditional laboratory testing system into separate portable components: a handheld indenter device, a独立的 force measurement system, and a data processing unit. This segmentation allows the testing functionality to be transported to the cable installation site while maintaining measurement precision through controlled indentation parameters and calibrated force application.
Solution Approach 2:
The patent replaces complex laboratory mechanical testing equipment with a simplified portable indentation system. By using a small controlled indenter instead of large tensile testing machines, the system achieves acceptable measurement precision in a portable format that can be easily transported and operated on-site.
3Device complexity
If only stiffness measurement is performed, then device complexity is reduced, but adaptability deteriorates
Solution Approach 1:
The patent implements a multi-functional indentation testing system that can measure multiple polymer properties through a single device. By varying indentation parameters (force, duration, depth) and analyzing different aspects of the indentation response (loading curve, holding curve, recovery curve), the system can assess stiffness, viscoelasticity, aging degree, and other mechanical properties, making the device adaptable to various polymer types and testing objectives.
Solution Approach 2:
The patent utilizes parameter changes in the indentation process to access different material properties. By changing indentation force magnitude, holding time, and indentation depth, the system can probe different aspects of polymer behavior. The analysis of force-displacement-time curves under varying parameters provides comprehensive characterization of polymer viscoelastic properties and aging states without requiring multiple specialized devices.
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
Enables accurate, non-destructive, and portable monitoring of polymer cable aging by measuring stiffness and deformation recovery time, effectively predicting cable degradation and extending the useful life of polymer-based components.
Implementation Method 1
measuring stiffness (measurement of force and displacement) of polymeric material
Implementation Method 2
generate indentation and post-indentation parameters that characterize the visco-elastic properties of the polymer material tested
Implementation Method 3
measuring the time taken by the polymeric material to recover a set portion of the initial deformation
Data Source
AI summary
The present invention provides a polymer indentation method and tester that includes measuring the time taken by a polymeric material to recover a set portion of an initial deformation and use this duration as a material degradation indicator. The recovery time was found to be more sensitive to cable degradation than the specific compressive stillness (or indenter modulus) measured during the indentation phase, and this high sensitivity was achieved for both thermally aged and irradiated polymer.