Front Face Spall of Concrete

POSTER

Abstract

Concrete cylinders (150 mm x 115 mm diameter) were impacted with half-inch steel spheres over a range of velocities (100 -500 m s$^{-1})$. Crater growth and debris cloud evolution were observed using high speed cameras aligned perpendicular and parallel to the impact direction. In-plane displacements of the impact face were tracked using Digital Speckle Photography (DSP). Radial cracking was seen to precede circumferential cracking on the high speed sequences and DSP showed bulk motion of fragments surrounding the impact zone. The profile images revealed no significant out-of-plane perturbations.

Authors

  • Adam Collins

    Cavendish Laboratory, University of Cambridge

  • David Chapman

    Cavendish Laboratory, University of Cambridge, University of Cambridge, UK

  • William Proud

    University of Cambridge, Madingley Road, Cambridge, CB3 0HE, UK, Cavendish Laboratory, University of Cambridge, Cavendish Laboratory, Cambridge University, University of Cambridge, UK, Univeristy of Cambridge, UK, University of Cambridge