Quasi-Static Analysis - Kinetic Energy

[Dave442]

Hi all,

I am running a large quasi-static structural analysis in Abaqus Explicit. In this analysis a relatively stiff part (elastic-plastic) comes into contact with a relatively flexible part (hyperelastic). I am using the general contact algorithm with the default frictionless properties. The analysis runs to completion without any issues.

I've noticed, however, that when I animate the results of the analysis, parts of the model oscillate ever so slightly. I have used a smooth step amplitude to ensure that loading is as smooth as possible and I have verified that the kinetic energy in each part is below 1% of the internal energy as recommended in the documentation.

However, I've noticed that the kinetic energy distribution in the flexible (hyperelastic) part is very noisy:

http://files.engineering.com/getfile.aspx?folder=468bd1f0-6d47-4be4-acff-2cf9c499ac4d&file=EKIN.png

I was wondering if anyone might have any tips for dealing with this issue? I've been reading the documentation but nothing is jumping out at me. Many thanks in advance!

Regards,
Dave

 

[Dave442]

Hi again,

I found that by including a small amount of friction in my analysis I could drastically reduce the degree of noisy kinetic energy without any effect on the results.

Dave