Perforation Thickness. - Continued

DOE-STD-3014-96

APPENDIX C

1.32

1.24

(C 6-7)

for 1.35 <

< 13.5

3.19

0.718

(C 6-8)

for

< 1.35

1.2 tp.

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

Bechtel Formula (1975)1

Based on full-scale tests, an empirical formula for predicting scabbing thickness

of concrete targets struck by solid steel missiles with velocities less than 500 ft/s

or 300 mph (152 m/s) was developed by Bechtel Corporation (Reference 5). The

scabbing thickness, ts, is given by:

W 0.4V 0.5

15.5

(C 6-9)

D 0.2

where:

The Bechtel and Stone & Webster formulas are presented here only to provide a historical

perspective. Due to their limited applications they are not recommended for use in aircraft impact

evaluation.

C-9