Nonlinear Transient
Hi,
I am doing non-linear transient analysis with LGDISP,
In this case i need to study the dynamic effect (increase in stress) due to increasing the operating speed.
Given enforced displacement using TABLED1 & TLOAD1. In TABLED1 the use defined displacement is 0 to 40mm in 0 to 7.5 sec.
If i need to increase the operating speed. (i.e) 0 to 40mm displacement in 0 to 3 sec
Will my dynamic results vary ? or its independent of time?
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Answers
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Hi,
I found that varying the event time from 7.5sec to 3 sec does not vary the result. Found stress results are independent of event time...
Can you please share me a tutorial for impl dynamic.
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Hi Karthik,
Can you share the tableD1 entries?
RIght now there is no tutorial available for Transient NL analysis. Except the attached.
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Hi Prakash,
Thank you for reply,
I have attached the TABLED1 content.
My question is if i need to attain the displacement of 40mm in 3 sec instead of 7.5 sec. (i.e) i need to study the dynamic effect (increase in stress when moment and inertia comes into play) due to increasing the operating speed.
Is this possible in nonlinear transient analysis
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Hi Karthik,
Transient analysis will consider dynamic effects like inertia or damping. Let me check with a sample model with the same time depedent table and I will update you my findings.
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Hi Prakash,
Thank you for your quick response
I tried a simple case and its considering the dynamic effects as per your previous post.
I still wonder how come a nonlinear transient takes dynamics into consideration but the simple direct transient does not ?
If non-linearity(Contact/ Geometric/ material ) is the difference between those two cases, how do they vary dynamically (inertia / momentum)
Please help me know the reason for it. Thank you once again
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Karthik,
Can you share your comparision results and model files?
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Hi Prakash,
Sure. Attached here
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Hi Prakash,
Altair Forum User said:Hi Kamalakar Rao,
Strain is a ratio of Change in length/original length. The same times 100 gives the percentage.
The result depends on your input. If your input is in %, the result output will be %
I need to plot the strain for my components that is yielding.
What should be the inputs for material property card (In Optistruct) to get proper strain results? should i give the material yield value? or what else to be input
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Hi Prakash,
Thank You for the support and guidance.
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Hi, i used this example in order to set my non NL transient analysis.
I have added an Initial condition through parameter IC, and TIC but this condition have not been read by my model.TIC have been setted with an initial displacement.
With Dload i applied Grav for all time of analysis.
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Hi,
Can you please share the .out file and also please share the example you are referring.
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Altair Employee
