Inertial Microcavitation high strain-rate Rheometry (IMR) correlates the evolution of the bubble pressure and the stress field in the material with the resulting kinematics, namely the change in bubble radius over time, which is recorded via high-speed videography.

IMR originated from the Franck Lab at University of Wisconsin Madison. The first paper utilizing IMR is located here. Now it is developed and maintained by the groups of Professors

• Christian Franck
• David Henann
• Eric Johnsen
• Jon Estrada
• Mauro Rodriguez
• Spencer Bryngelson
• Jin Yang.

The main-release repository is IMR_v1. There is a user guide and documentation to get you started. Another good resource is the README.md in the repositories.

If you have questions, you can contact the maintainers (e.g., Jon Estrada) and/or request to join the IMR Slack workspace.

1. J. B. Estrada, C. Barajas, D. L. Henann, E. Johnsen, and C. Franck, “High Strain-rate Soft Material Characterization via Inertial Cavitation,” J. Mech. Phys. Solids, vol. 112, pp. 291–317, 2017.
2. C. Barajas and E. Johnsen, “The effects of heat and mass diffusion on freely oscillating bubbles in a viscoelastic, tissue-like medium,” J. Acoust. Soc. Am., vol. 141, no. 2, pp. 908–918, 2017.
3. C. T. Wilson et al., “Comparative study of the dynamics of laser and acoustically generated bubbles in viscoelastic media,” Phys. Rev. E, vol. 99, no. 4, p. 043103, Apr. 2019.
4. L. Mancia, M. Rodriguez, J. Sukovich, Z. Xu, and E. Johnsen, “Single–bubble dynamics in histotripsy and high–amplitude ultrasound: Modeling and validation,” Phys. Med. Biol., vol. 65, no. 22, p. 225014, Nov. 2020.
5. J. Yang, H. C. Cramer, and C. Franck, “Extracting non-linear viscoelastic material properties from violently-collapsing cavitation bubbles,” Extrem. Mech. Lett., vol. 39, p. 100839, 2020.
6. J.-S. Spratt et al., “Characterizing viscoelastic materials via ensemble-based data assimilation of bubble collapse observations,” J. Mech. Phys. Solids, vol. 152, no. August 2020, p. 104455, Jul. 2021.
7. L. Mancia, M. Rodriguez, J. R. Sukovich, S. Haskel, Z. Xu, and E. Johnsen, “Acoustic Measurements of Nucleus Size Distribution at the Cavitation Threshold,” Ultrasound Med. Biol., vol. 1, no. 1, pp. 1–6, Jan. 2021.
8. J. Yang, A. Tzoumaka, K. Murakami, E. Johnsen, D. L. Henann, and C. Franck, “Predicting complex nonspherical instability shapes of inertial cavitation bubbles in viscoelastic soft matter,” Phys. Rev. E, vol. 104, no. 4, pp. 1–9, 2021.
9. L. Mancia et al., “Acoustic cavitation rheometry,” Soft Matter, vol. 17, no. 10, pp. 2931–2941, 2021.
10. J. Yang, H. C. C. III, E. C. Bremer, S. Buyukozturk, Y. Yin, and C. Franck, “Mechanical characterization of agarose hydrogels and their inherent dynamic instabilities at ballistic to ultra-high strain-rates via inertial microcavitation,” Extrem. Mech. Lett., vol. 51, p. 101572, 2021.
11. A. McGhee, J. Yang, E.C. Bremer, Z. Xu, H.C. Cramer III, J.B. Estrada, D.L. Henann, and C. Franck, “High-Speed, Full-Field Deformation Measurements Near Inertial Microcavitation Bubbles Inside Viscoelastic Hydrogels,” Exp. Mech., 2022.