Characterisation of Fatigue Crack Growth in Silicone for Deap Technology

Thor Thorup

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Abstract

In this paper, the fatigue crack growth characteristics of Elastosil
R RT 625 are determined by performing fatigue crack experiments based on ISO 27727. Elastosil R RT 625 is a silicone rubber used by Danfoss PolyPower A/S as the dielectric material in their DEAP elements.
Cracks were characterised by a large amount of crack tip roughening, and a crack pattern that oscillated around the mean crack propagation direction. The amount of deviation from the expected crack path was proportional to the strain-level in the test. Despite the rough oscillating crack appearance, a linear
relationship between the crack length and the amount of cycles was obtained. When plotting the crack growth per cycle against the applied load, the existence of a power law domain which can be described by Paris’ Law was observed. The silicone rubber had a significantly lower b exponent than a large range of other
rubbers.
Original languageEnglish
Title of host publicationProceedings of International Mechanical Engineering Congress & Exposition
Volume3
PublisherAmerican Society of Mechanical Engineers
Publication date2012
Pages627-634
ISBN (Print)9780791845196
DOIs
Publication statusPublished - 2012
EventIMECE 2012 - Houston, TX, United States
Duration: 9 Nov 201215 Nov 2012

Conference

ConferenceIMECE 2012
CountryUnited States
CityHouston, TX
Period09/11/201215/11/2012

Bibliographical note

Copyright © 2012 by ASME

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