experimental investigation of fracture by cavitation of model elastomeric networks
A new methodology to investigate the failure of elastomers in a confined geometry has been developed and applied to model end-linked polyurethane elastomers. The experimental in situ observations show that the elastomers fail by the growth of a single cavity nucleated in the region of maximum hydros...
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Published in | Journal of polymer science. Part B, Polymer physics Vol. 48; no. 13; pp. 1409 - 1422 |
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Main Authors | , , , , , |
Format | Journal Article Conference Proceeding |
Language | English |
Published |
Hoboken
Wiley Subscription Services, Inc., A Wiley Company
01.07.2010
Wiley |
Subjects | |
Online Access | Get full text |
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Summary: | A new methodology to investigate the failure of elastomers in a confined geometry has been developed and applied to model end-linked polyurethane elastomers. The experimental in situ observations show that the elastomers fail by the growth of a single cavity nucleated in the region of maximum hydrostatic stress. Tests carried out at different temperatures for the same elastomer show that the critical stress at which this crack grows is not proportional to the Young's modulus E but depends mainly on the ratio between the mode I fracture energy GIC and E. A reasonable fit of the data can be obtained with a model of cavity expansion by irreversible fracture calculating the energy release rate by finite elements with a strain hardening constitutive equation. Comparison between different elastomers shows that the material containing both entanglements and crosslinks is both tougher in mode I and more resistant to cavitation relative to its elastic modulus. |
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Bibliography: | http://dx.doi.org/10.1002/polb.22026 ArticleID:POLB22026 ark:/67375/WNG-2XGTR49W-B istex:33F165790F40C13642DC5325595E8BCB328451AF ObjectType-Article-1 SourceType-Scholarly Journals-1 ObjectType-Feature-2 content type line 23 |
ISSN: | 0887-6266 1099-0488 1099-0488 |
DOI: | 10.1002/polb.22026 |