Your feedback expected for Dynamic Impact Analysis Model
Ashish Poudel
Greetings Everyone,
I’m working on a dynamic impact analysis problem. I’m depicting the motion of an experiment where a wheel crashes over foam surface on a pendulum motion such that having a dip at center of foam.
I’ve depicted the motion of wheel as per the experiment. But I’m not getting the forces (Drag and Vertical) as per the experimental value. I’ve attached the picture of expected values and obtained.
I know I am not expected to get exactly the same value as the expected values of experiment but there must be almost unison with the values. The drag force values seems okay at first but later it’s values are deviated. Also, the vertical force is way less than the expected value.
What’s wrong I’m doing in my model? The contact card I’m using is attached here. What can be the parameters that I may have overlooked or used wrong for my case. The parameters such as E, stress-strain curve , friction coefficient are used as per the original experiment conducted.
I expect both drag force and vertical force to have the similar values as per the experiment.
Thank you for your time. Your response is highly appreciated. Looking forward to your feedback.
Yours Sincerely,
Ashish Poudel
Masters Student
Kangwon National University
l...@schwer.net
I suggest you initially focus on your frictional coefficients.
It is rare for an experiment to measure the coefficient of friction, even more rare to measure both the static and dynamic coefficients of friction, especially the latter in the form LS-DYNA defines the dynamic coefficient of friction:
Note: your input sets FS-FD=0.2 so the dynamic coefficient is independent of speed (velocity). This is likely not correct.
--len
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