A strain-based porosity model for use in hydrocode simulations of impacts and implications for transient crater growth in porous targets

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Numerical simulations of impact crater formation with dilatancy (2014, methodology): “First, the impact will permanently compact pore space in a proximal zone where pressures exceed the crushing strength [Wünnemann et al., 2006], increasing the relative density of the target near the crater center.”
Improvements to the ɛ-α porous compaction model for simulating impacts into high-porosity solar system objects (2011, methodology): “Application to solar system impacts The original - model was used in the iSALE hydrocode [6] to investigate the effect of lowmoderate target porosity on cratering efficiency [6], melt production [10] and ejection velocity.”
Constraining the size of the South Pole-Aitken basin impact (2010, methodology): “…Chicxulub (Collins et al., 2008b); Ries (Wünnemann et al., 2005); Chesapeake (Collins and Wünnemann, 2005) and Haughton (Collins et al., 2008a) and is well tested against other hydrocodes (Pierazzo et al., 2008) and laboratory experiments at both high and low strain-rates (Wünnemann et al., 2006).”
A ballistics analysis of the Deep Impact ejecta plume: Determining Comet Tempel 1's gravity, mass, and density (2007, background): “…that as a material's porosity increases, its μ value approaches the theoretical limit of 1/3 (initially described in Holsapple and Schmidt, 1987), while its cratering efficiency proportionality constant K 1 value decreases (recently shown by the CHD modeling described in Wünnemann et al., 2006).”