Physics of Soft Impact and Cratering by Hiroaki Katsuragi

Author:Hiroaki Katsuragi
Language: eng
Format: epub
Publisher: Springer Japan, Tokyo

4.4 Summary

Various impact (and slow) drag forces produced by soft matter targets were reviewed throughout this chapter. In particular, the granular drag force by the vertical impact of a solid sphere was emphasized, and a simple unified drag force model was derived on the basis of experimental results. Many other experimental results on granular drag force were overviewed, and their complex behaviors were understood in terms of scaling and dimensional thought. Because of the rich phenomenology, a completely unified understanding of granular impact drag force has not yet been achieved. Systematic and unified understandings of these diverse results are still insufficient to clarify the entire granular impact dynamics. Alternatively, many experimental results were merely introduced and summarized in this chapter. Then, the slow granular drag force was emphasized, and some interesting topics such as granular swimming were also discussed. After reviewing slow granular drag mechanics, drag forces in complex fluids such as viscoelastic, viscoplastic and dense suspensions were also discussed. Up to this point, the fundamental physical concept of the drag force by soft matter impact has been discussed along the line of continuous mechanics formulae. We have focused on fundamental physics rather than application to actual planetary impact phenomena. Starting from the next chapter, the physics and morphology of actual impact cratering on a planetary scale and some related fundamental physical processes will be mainly discussed.

Download

Copyright Disclaimer:
This site does not store any files on its server. We only index and link to content provided by other sites. Please contact the content providers to delete copyright contents if any and email us, we'll remove relevant links or contents immediately.