The Calculation Of The Depth Of Penetration For
Projectiles Into Rock
Author(s)
M. Y. Wang, Z. Shanbiao & Z. Daliang
Abstract
In this paper, an analytical model is used for characterizing the deformation and
failure behavior of the rock in the process of penetration. The scaling law in
penetration and perforation is uncovered, resulting in a formula for the
computation of penetration on wide scales on a sound physical background.
Key words: penetration, scaling relation, critical stress-intensity factor.
1 Introduction
The problems of penetration and perforation into rock by projectiles have been
studied for a long time, but to date, there has been not yet a completely
satisfactory method for solving such problems due to their complex
characteristics such as elastic and non-elastic deformations concomitantly
occurring accompanied by crack propagation in the process of penetration and
perforation. As a result, empirical formulas derived from experimental data
consist in the main part of research products [1-3]. However, such purely
experimental approaches have some defects, the most significant of which is that
the results extrapolated from these formulas are not reliable where the change is
extremely large in values of radius of projectiles or in values of other original
parameters beyond the range of experiment. Hence, the major empirical formulas
have a limited range of application and an alternative procedure should be
developed to cover a wider scale.
In addition to empirical procedures, there are several theoretical models
which can be classified into four groups as follows [4-6]: The first one is the
rigid-plastic model, the second one is the classic spherical cavity expansion
model and the third one is the numerical model.
Keywords
penetration, scaling relation, critical stress-intensity factor.
Related Book
Other papers in this volume
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