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International Journal of Fracture

, Volume 205, Issue 1, pp 1–21 | Cite as

Damage in elastomers: nucleation and growth of cavities, micro-cracks, and macro-cracks

  • X. Poulain
  • V. Lefèvre
  • O. Lopez-Pamies
  • K. Ravi-ChandarEmail author
Original Paper

Abstract

The nucleation of internal cavities and their transition to cracks are examined at high spatial and temporal resolutions within polydimethylsiloxane (PDMS) elastomers of various cross-link densities under externally applied quasi-static mechanical loads. The focus here is on experiments where the initiation and propagation of internal damage are designed to occur in between two spherical glass beads that are firmly embedded within a matrix of the PDMS elastomer and are placed close to each other in order to generate a high triaxial stress state. An optical microscope is used to monitor the various processes of nucleation and growth of cavities and cracks at a spatial resolution of about \(1\,\upmu \hbox {m}\) and a temporal resolution of about 66.7 ms. In combination with corresponding full-field simulations, the experiments show that the nucleation of cavities—that is, the onset of cavitation—is an extremely fast process (involving stretch rates in excess of \(100\,\hbox {s}^{-1})\) that is controlled primarily by the stiffening at large deformations of the underlying elastomer and, more critically, by its fracture properties. The experiments and simulations also show that cavitation is followed by two distinct events upon further macroscopic loading: the transition of the nucleated cavities to micro-cracks, and the further transition of some micro-cracks to macro-cracks. These two distinct events are also controlled primarily by the fracture properties of the underlying elastomer.

Keywords

Cavitation Neo-Hookean Fracture Polydimethylsiloxane Triaxiality 

Notes

Acknowledgements

This work was performed during the course of a collaborative investigation into cavitation, fracture and damage in soft materials funded by the National Science Foundation Grants CMMI-1235352 and CMMI-1235138. This support is gratefully acknowledged.

Supplementary material

Supplementary material 1 (avi 28783 KB)

Supplementary material 2 (avi 16265 KB)

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Copyright information

© Springer Science+Business Media Dordrecht 2016

Authors and Affiliations

  • X. Poulain
    • 1
  • V. Lefèvre
    • 2
  • O. Lopez-Pamies
    • 2
  • K. Ravi-Chandar
    • 1
    Email author
  1. 1.Department of Aerospace Engineering and Engineering Mechanics, Center for Mechanics of Solids, Structures, and MaterialsUniversity of Texas at AustinAustinUSA
  2. 2.Department of Civil and Environmental EngineeringUniversity of Illinois Urbana-ChampaignUrbanaUSA

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