High-Rate Dynamics and Fracture Behavior of Model Polymer Network Characterized by Seeded Laser-Induced Cavitation
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Understanding high-strain rate (HSR) mechanical properties of soft polymers is crucial to elucidate the dynamics and damage mechanisms of soft tissues under HSR mechanical stimuli. Seeded laser-induced cavitation (SLIC) with ultrafast stroboscopic imaging capability is exploited to characterize the viscoelastic and fracture mechanics of soft polymers at HSRs of 106 s-1. We first utilize a model viscoelastic material, Sylgard 184 with different curing times to systematically vary the elastic modulus for visualizing continuous transition from viscous fluid to viscoelastic solid over time. Numerically analyzed HSR properties, obtained from time-dependent radii of cavities, are correlated with quasi-static or low-strain-rate characteristics. Then, using SLIC we characterize tunable swollen polymer networks having solvent levels similar to those of soft tissues. This framework can be used to develop tailored synthetic systems that precisely mimic the HSR dynamic behavior of soft tissues. *Funding acknowledgment: This work was funded by the Office of Naval Research Grant ONR N00014-17-1-2056.