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# Static vs transient analysis in ANSYS

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## Static vs transient analysis in ANSYS

(OP)
Good day,

I would like to know the differences between a static and transient analysis in mechanics. I did research and found that the transient analysis adds the inertial and damping effects, but I don't really understand what this means.

I got this doubt, because we were analyzing the reaction forces in a lid that will be subjected to an impulse load, which goes form 1000 psi to 0 psi in 0.002 seconds. Our first though was to consider the load as a static and get the reaction in the supports, but one of our peers suggested approaching this with a transient analysis to see the dynamic response of this lid.

Approaching this problem with a transient analysis, are we going to obtain a different force reaction in the supports than doing it with a static analysis? or what outputs are we going to get with a transient analysis?

If you can also suggest literature to keep researching, it will be great.

### RE: Static vs transient analysis in ANSYS

If the load changes from 1000 psi to 0 psi in 0.002 Seconds then the loading is not a static loading by any means it is a transient load since it varies with time.

### RE: Static vs transient analysis in ANSYS

A transient analysis shows reaction over time, a static analysis shows reaction at a single point in time. Static is often faster to run and if set up correctly can accurately show the max/min/best/worst case scenario, OTOH when life gets complicated you often need transient analysis to really understand what is going on.

### RE: Static vs transient analysis in ANSYS

If the load (or the load-change) is both sudden and non-impactive, then a good starting guess is that the dynamic effect of the load will be two times its static effect.  To quote from my very old copy of Roark's Formulas for Stress and Strain:  "the ordinary assumption that sudden loading causes twice as much stress and deflection as static loading is always a safe one to make".

### RE: Static vs transient analysis in ANSYS

It all depends on the dynamic response of the lid relative to your impact interval. I believe Roark's estimate applies in the case that the dynamic modes of the structure remain subcritical and the relative foot print of the impact area.

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