Drop test simulation - Mechanism damping

ghorvath · ‎Feb 12, 2014

Hi PTC Fellows,

I need help for my Mechanism simulations. I'm working on a drop test analysis. This means the impacts between the granite/concrete/steel blocks and danamid/aluminium specimens. Creo needs to know the mechanism damping [sec/mm] for both materials. (3D contact as constrain)

Can anybody help me? How can I determined this parameters? Measurement (3db bandwidth or logarithmic decrement method)? Is there a summary table for several materials?

Thanks for the helping

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DenisJaunin · ‎Feb 17, 2014

Hello, Gyorgy,

Herewith some links may be information that you seek.

Cordially.

Denis.

http://en.wikipedia.org/wiki/Impact_factor

http://www.powells.com/biblio/9780486420042

http://cursos.itcg.edu.mx/libros/Libros%20y%20Manuales%20de%20Ingenieria/Engineering%20Books/Harris__Shock_And_Vibration_Handbook/HARRIS~1.-HA/

ghorvath · ‎Feb 18, 2014

Hello Denis,

Thanks for your answer.

The second link was helpful, but I'm looking for a table which included the correct parameters. I found on the internet a study about the dampings:

http://teaching.ust.hk/~mech300/mech300_7_1_damping_ref.pdf

But I'm not sure which damping needs me. (viscous damping ratio, material damping, loss factor, etc) First of all I have to clarify it.

I tried the 0.008 for the concrete block and 0.001 for aluminium specimen but the result of the simulation does not seem real. The local PTC support said me that I need to "iterate" these parameters based on the experience of the test.

Regards, Gyorgy

DenisJaunin · ‎Feb 17, 2014

Hello, Gyorgy,

I have a paper on the subject, but in French, if you do not dérenge.

Cordially.

Denis.

http://www.sendspace.com/file/4vx7st