[MBDyn-users] Constitutive law for a chain

Pierangelo Masarati masarati at aero.polimi.it
Fri May 9 02:20:33 CEST 2008

Rudi Jaeger wrote:

> the beginning and increasing it later. At some point the mass "falls" into
> the chain and starts to bounce a couple of times.
> Do you see things the same way?
> Why does this only work with the quadratic drive and not with
> the piecewise linear one (mass seems to bounce all the time)?

The linear imposed strain seems to induce sort of an impulsive force in 
the rope, which is not contrasted later by the rope, since the 
constitutive law yields zero for negative strains.  The parabolic 
shortening seems to be much more regular.  You need to somehow 
regularize your input.

Cheers, p.

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