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or:
tm = (ib/ru)(3  mu/2mE) + (1/ru)[(mu/2mE)  1]
x (9i2b  6mEruXE)1/2
10.
NOTATION.
a

Acceleration of system, in/ms2
B

Pressure intensity, psi
ib

Unit blast impulse, psims
KE

Equivalent elastic unit stiffness
KLM

LoadMass factor
m

Unit mass, psims2/in
ma

Average of the effective elastic and plastic unit masses,
psims2/in
me

Effective elastic unit mass, psims2/in
mu

Effective unit mass in the ultimate range, psims2/in
mup

Effective unit mass in the postultimate range, psims2/in
_
p

Applied pressure, psi
_
p

Effective pressure during time interval 0 < /= t < tE, psi
PE

Pressure at time t = tE, psi
r

Unit resistance of system, psi
ru

Ultimate unit resistance, psi
rup

Postultimate unit resistance, psi
tE

Time to reach maximum elastic deflection, ms
tm

Time at which maximum deflection occurs, ms
tu

Time at which ultimate failure occurs, ms
t1

Time at which partial failure occurs, ms
T

Load duration, ms
TN

Natural period of vibration, ms
v

Velocity, in/ms
2.0813


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