Measuring the response of soft materials to high strain rate deformation is extremely challenging because of the difficulty of achieving dynamic equilibrium during high strain rate mechanical testing such as Kolsky bar testing. Digital image correlation (DIC) using high speed cameras is well suited for improving the ability to characterize the non-equilibrium deformation of soft samples subject to dynamic loading conditions, providing a rich data set that can be used to better deduce the dynamic constitutive response of the material. A prospective tissue simulant material is tested in compression at high strain rate using a Kolsky bar. The non-equilibrium deformation of the specimen, including the surface (Rayleigh) wave motion, is captured using a high speed stereo camera pair recording at 180,000 frames per second. The image correlation results are used in conjunction with finite element modeling to deduce the dynamic constitutive response of the material in this high strain rate test.
Proceedings Title: SEM 2009
Conference Dates: June 1-4, 2009
Conference Location: Albuquerque, NM
Pub Type: Conferences
digital image correlation, high strain rate, kolsky bar, solft materials kolsky bar, soft materials, high strain rate, digital image correlation