Laser-induced Cavitation Dynamics of Polydimethylsiloxane with Varying Cross-Linking Density and Molecular Weight

ORAL

Abstract

High-strain-rate mechanical properties of a cross-linked polymeric model system are relevant to understanding the dynamics and damage mechanisms of various biological tissues under HSR mechanical stimuli. We present the characterization of two material systems: 1) a commercially available polydimethylsiloxane (Sylgard 184) prepared with varying crosslinking times at fixed temperature; 2) a UV-curable polydimethylsiloxane having different controlled molecular weights. For high-strain-rate characterization, we performed laser-induced cavitation with ablation seeds. The ablation seed in a specimen was vaporized without dielectric breakdown, and produced a rapidly expanding cavity. The expansion dynamics of the laser-induced cavity was observed using ultrafast imaging. The dataset obtained from time-dependent radii of cavities was numerically analyzed, and the material's HSR mechanical parameters were identified. This study can lead us to establish a high-strain-rate mechanical characterization method for soft materials including various tissues.

*This research was supported by the Office of Naval Research under contract N00014-17-1-2056.

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Presenters

  • Sacchita Tiwari

    • Mechanical and Industrial Engineering, University of Massachusetts, Amherst

Authors

  • Sacchita Tiwari

    • Mechanical and Industrial Engineering, University of Massachusetts, Amherst

  • Yue Zheng

    • Department of Mechanical and Aerospace Engineering, University of California, San Diego
    • Mechanical Engineering, University of California San Diego
    • Mechanical and Aerospace Engineering, University of California San Diego, California

  • Amir Kazemi-Moridani

    • Mechanical and Industrial Engineering, University of Massachusetts, Amherst

  • Kelly McLeod

    • Polymer Science and Engineering, University of Massachusetts, Amherst

  • Ipek Sacligil

    • Polymer Science and Engineering, University of Massachusetts, Amherst

  • Christopher Barney

    • Polymer Science and Engineering, University of Massachusetts, Amherst

  • Alfred Crosby

    • University of Massachusetts Amherst
    • Polymer Science and Engineering, University of Massachusetts Amherst
    • Polymer Science and Engineering Department, University of Massachusetts Amherst
    • Polymer Science and Engineering, Univ of Mass - Amherst
    • Polymer Science and Engineering, UMass Amherst
    • Polymer Science and Engineering, University of Massachusetts
    • Polymer Science and Engineering, University of Massachusetts, Amherst

  • Gregory Tew

    • Polymer Science and Engineering, University of Massachusetts, Amherst

  • Shengqiang Cai

    • Mechanical and Aerospace Engineering Department, University of California, San Diego
    • University of California, San Diego
    • Department of Mechanical and Aerospace Engineering, University of California, San Diego
    • Mechanical Engineering, University of California San Diego
    • Mechanical and Aerospace Engineering, University of California San Diego, California

  • Jae-Hwang Lee

    • University of Massachusetts Amherst
    • Department of Mechanical and Industrial Engineering, University of Massachusetts
    • Mechanical and Industrial Engineering, University of Massachusetts, Amherst