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DOE-STD-3014-96
APPENDIX C
tp
x
1.32
1.24
D
D
(C 6-7)
x
for 1.35 <
< 13.5
D
or
tp
2
x
x
3.19
0.718
D
D
D
(C 6-8)
x
for
< 1.35
D
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
ts
(C 6-9)
D  0.2
fc
where:
1
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


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