Perforation Thickness. - Continued

DOE-STD-3014-96

APPENDIX C

Degen Formula (1980)

Based on experimental investigations, Peter Degen (Reference 8) proposed a

partial revision to the Modified NDRC formula (Reference 4). The basic

penetration depth, x, computed by the Modified NDRC can be used to compute

the perforation thickness as follows:

0.69

1.29

(C 6-13)

for 2.65

2.2

0.3

(C 6-14)

for

1.52

To prevent perforation, minimum concrete thickness, td, shall be

1.2 tp.

CRIEPI Formula (1985)

The Central Research Institute of the Electric Power Industry (CRIEPI) of Japan

(Reference 9) conducted impact testing focusing on low velocity missiles and proposed

the CRIEPI formula, which amended the Modified NDRC formula and the Chang formula

(Reference 3). Thus, the scabbing thickness (ts) and the perforation thickness (tp) are

given by:

C-12