Which collapse load, liquid jet or shock wave, causes cavitation erosion?

For a bubble of maximum radius $R_{\max}$ collapsing at stand-off parameter $\gamma = d/R_{\max}$ from a rigid wall, determine the peak wall pressure, its duration and impulse from jet impact (jet speeds $\sim 10^{4}\,\mathrm{cm/s}$ and above) versus the shock emitted at the collapse of the toroidal bubble, as functions of $\gamma$, and which quantity correlates with measured pit formation in metals. An answer is a damage criterion in terms of $\gamma$, $R_{\max}$ and driving pressure that predicts pit depth and occurrence.

Synchronized high-speed imaging, wall-pressure measurement and post-mortem pit analysis on metal targets over a scan of $\gamma$, compared with compressible simulations of the same collapses.