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Blast Design - Pressure, Duration, Impulse
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Source：Internet Author：Unknow Pubdate：2010-07-24
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michaelpjr (Structural)
22 Jul 10 10:59
Does a higher impulse always control blast design? Or should pressure and duration be considered more in depth?
Example: Here we have two blast scenarios. Let's assume for this case that the member in question is a simply connected wide-flange member.
Scenario 1:
p1 = 1.0 psi
t1 = 50 ms
Scenario 2:
p2 = 0.5 psi
t2 = 100 ms
Obviously, impulses for the two cases are equal. Does this mean that either is an acceptable design scenario?
What if d2 = 105 ms? Would the larger impulse control or does the longer duration (t2) have a more significant effect due to rigidity and stress-strain of the material with respect to time?
Does natural frequency play a part in choosing the design scenario?
Does material play a part?
sjohnAM (Structural)
24 Jul 10 2:34
字串2
The natural frequency will play a large part. I think it's td/Tn that will tell you what will happen with the member. If that ratio is over 0.5, then the maximum displacement will occur during loading; otherwise, the maximum deflection will be the same as the member rebounds, without damping. Then the material will basically limit the maximum deformation that can be allowed.
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