Learning Forum

[Pranshu Kharbanda]

Hi all, I have been working with transient analysis for simulation of stress at high frequencies (150 Hz & above). That is, the strain is in the order of 1.3%, however since the frequency is high, the strain rate is of the order 10^2 to 10^3/s. Based on your experiences, can someone advise if it is okay to perform the simulation in transient or do i need to switch to explicit. I need to consider inertia and damping effects.

I read the manual's recommendation which mentions 'Events with time scales of less than 1 second (usually of order 1 millisecond) are efficiently simulated with this type of analysis. For longer time duration events, consider using a Transient analysis system'. So, does it mean simulating such events in transient will not give the correct results ? I am more familiar with transient hence this query. If any further clarification needed, let me know.

Thanks.

[Ram Gopisetti]

Hi Pranshu, 

What is the actual time you are considering?

Since the strain rate is high and no time information is given in your description, we cannot recommend you

Generally, using the explicit is good, but time is important. Both methods account for time, inertial, and damping effects, but the computing framework will change (implicit vs. explicit).

cheers, ram 

[Pranshu Kharbanda]

Hi Ram,

I have shown below the input loading which is in the form of sawtooth displacement (displacement in microns). You may see the time where frequency here is 200 Hz (hence the time for one cycle : 1/200 = 0.005). Similarly for 150 Hz you may expect time/cycle to be 1/150s. I understand that the computing framework will change, but unable to comprehend if there will be any difference in terms of accuracy. Thanks