MAE 695-06 Penetrator Equations 04/07/2008

The Young Penetrator Equation C.W. Young, Sandia National Laboratories: For V ≥ 61 m/s For low weight penetrators, in “soft” material, modification to RHS of equation: Therefore,

The Young Penetrator Equation

LUNAR-A Deceleration Typical acceleration of a mass over a distance:

LUNAR-A Deceleration

Future Work Open issues: Lunar regolith – rock, soil, layering, … ? Lunar regolith penetrability, S-number LUNAR-A nose coefficient, N-number Ks value, use, etc. m/A scaling Penetrator equations AIAA Paper Equations, S-number, N-number, absense of Ks? Forrestal NDRC (Joint Services Manual for the Design and Analysis of Hardened Structures to Conventional Weapons Effect) Other?

References Young: C.W. Young, “An Empirical Equation for Predicting Penetration Depth Into Soft Sediments,” IEEE, 1981. C.W. Young, “Penetrator Equations,” Contractor Report, SAND97-2426, Unlimited Release, UC-705. C.W. Young, “Simplified Analytical Model of Penetration with Lateral Loading: User’s Guide,” Contractor Report, SAND98-0978, Unlimited Release, UC-705. Other: Amy S. Lo, et al., “Penetrator Science – Making an Impact on Planetary Compositional Science,” AIAA 2006-7423.