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.

–

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