Force-displacement curve
Altair EmployeeHello Sir,
I am working on thin-walled structure. I had got the successful run for the model but the force- displacement curve is not in a way that i wanted it to be. There should be the peak force at the starting and then gradual decrease in force. Please help me .The curve that i want it should be look like the following curve
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Answers
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Hi,
This simulation seems to be a quasistatic run which generally takes more time in actual physical condition . You can try increasing the ramp time of displacement(upto 0.2-0.3)
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Hi CHirag,
It seems like the dynamic effects during the simulation causes for this type of curve. As Gopal suggested try ramping the load gradually on to the model.
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Hi
seems like there are POSSIBLE INCOMPATIBLE KINEMATIC CONDITIONS BETWEEN:
BOUNDARY CONDITION
RIGID WALL0 -
Hello Sir,
I don't understand what you want to explain. could you please explain me in details that what should i do to get proper curve?
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hello Sir
Please help me out.Please explain me.
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Hi Chirag,
For the imposed displacement load create a smooth and gradual load ramping so that the high dynamic effects can be reduced.
Please go through https://altairuniversity.com/learning-library/7-guidelines-to-apply-quasi-static-load-in-explicit-simulation/ which gives guidelines to quasi static loading in explicit simulations. You can also try using a filter for the curve.
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Hello Sir,
I had given the imposed displacement to the rigid wall. The times for the curve are 0, 0.045,0.05 and displacements are 0, 135,130. Should i have to use the imposed displacement instead of the imposed velocity? I don't understand that ramping load. Could you explain me please how to get solve this problem?
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Hi,
You can do foll. change in curve .Impose displacement is fine
0.000000000000 0.000000000000
4.5000000000000E-02 -135.0000000000
5.0000000000000E-02 -130.0000000000Increase 0.0045 to some 0.3 Higher this lesser will be dynamic effects . Basically we would like the load to reach in slower time to achieve a quasistatic condition
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hello Sir,
I have the same coordinates for the curve but in prvious run the force displacement curve is not good. Should i have to use the new coordinates as follows
0 0
0.28 -135
0.3 -130
the engine tstop time is 0.05 .Does it need to be change?
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Hi,
Yes Tstop time will be 0.3 now
Run this and check the F-D curve
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hello Sir,
I had made changes but this time the the crushing of the middle box did not completed. It has crushed only the starting part may be only 20% of the length.
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Hi,
Is the time completed or error came?
Share the curve used for imposed displacement
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Hello Sir
This is the curve that i got. The peak value at the first is nearly only 3500 but through the experimental results i had got it nearly 32000 also the wall does move only 25 mm though the curve defined had value 130. please help me ....
<?xml version="1.0" encoding="UTF-8"?>
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Hi sir,
What's wrong in my model?
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hello Sir,
could you suggest me what should i Do?
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Hello Sir
This is the curve that i got. The peak value at the first is nearly only 3500 but through the experimental results i had got it nearly 32000 also the wall does move only 25 mm though the curve defined had value 130. please help me ....
<?xml version="1.0" encoding="UTF-8"?>
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