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FEA Analysis on Pressure Vessel Using Patran/Nastran

FEA Analysis on Pressure Vessel Using Patran/Nastran

FEA Analysis on Pressure Vessel Using Patran/Nastran

(OP)
Hello My Friends,

Anyone has any experiences using Patran/Nastran (MSC Software) to analyze a pressure vessel under a 20g shock test?  If you do, please let me so that I could ask you some specific questions.

Thanks a lot for your time and help.

Regards,

RE: FEA Analysis on Pressure Vessel Using Patran/Nastran

110303:  Many years ago I sued NASTRAN to do shock analysis on ships.  Don't know I I can help but let's try

Regards
Dave
www.wsec1.com

RE: FEA Analysis on Pressure Vessel Using Patran/Nastran

Nastran NL ? ... the key to the problem is how quickly does the pressure vessel stop.  After 18" it'll be falling at about 10 ft/sec. if it stops instantly, the g's are infinite; if it stops (deaccelerating linearly) in roughly 0.06sec, it'll experience 20g

RE: FEA Analysis on Pressure Vessel Using Patran/Nastran

(OP)
Thanks rb1957.  How did you get 20g with the given time of 0.06 sec.  I got 10 / 0.06 = 167 ft/sec2, which I believe is 5.2g.  Where did I do wrong?  

Thanks a lot for your help.

RE: FEA Analysis on Pressure Vessel Using Patran/Nastran

duh, 1/64 is not equal to 1/16 (0.06) !!!

20g = 640 ft/sec2

t = v/a = 10/640 = 1/64 = 0.015

BUT remember this is constant deceleration, which may be conservative, and who knows how long the original test took ? (so how do you justify the number ?)  the best answer to this i think is what is general practice.

good luck

RE: FEA Analysis on Pressure Vessel Using Patran/Nastran

(OP)
Thanks rb1957 for your help.  I will use this analysis for now before I do the FEA analysis.

Regards

RE: FEA Analysis on Pressure Vessel Using Patran/Nastran

I'm sorry, but I have to say this. There is no such thing as a Finite Element Analysis Analysis (FEA Analysis). There is, however, such a thing as an FE Analysis or just FEA.


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RE: FEA Analysis on Pressure Vessel Using Patran/Nastran

(OP)
You are correct.  My mistake.

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