Method and system for health monitoring of composite elastomeric flexible elements
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United States of America Patent
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May 2, 2017
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Nov 12, 2014
filing date -
Nov 25, 2013
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Abstract
A composite elastomeric flexible element has an elastomer layer between rigid members. When subjected to loads, and as time goes by, the elastomer layer will undergo damage in the form of micro-voids and polymer chain scission. The time it takes the damage to reach a predetermined, but safe state is a known function of several parameters such as loading rate and load magnitude, time at load, temperature and frequency. The damage decreases the electrical permittivity of the elastomer and changes the electrical conductance of the elastomer if the elastomer is in the environment of an electrically conductive fluid or when the elastomer includes conductive filler. The health of the flexible element is monitored by measuring the electrical impedance of the elastomer layer, computing an indication of health from the electrical impedance and trend data for the elastomer layer, and reporting the indication of health to a human administrator.
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