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Subject: Analyzing acceleration loads...was Re: Reversing l
Author: Paul Anschel
Date: 2002-06-12 10:38:00--- In xansys@y..., Christopher Wright wrote:
> >1. To approach this as an acceleration analysis, would I require
> >LSDyna or could this be approximated in Ansys Mechanical?
> ANSYS mechanical cna handle shock analysis. If it were my I'd model
the
> housing and internals in enough detail to capture the load path and
> attach it to a rough model of the 'larger mass.' Make sure you get
all
> the mass, since the inertia loading will dominate.
> I'm guessing, but I suspect the 200g is an equivalent static
acceleration
> which includes dynamic amplification of the applied load. So you
can
> apply the 200g statically to the finite element model and get a
good
> handle on where the weak point is and what the bolt loads are.
Don't try
> to calculate inertia forces, it's too much work, and you can get
the same
> result by applying uniform acceleration with the ACEL,... command.
This approach appeals to me because I can conceive with my current
knowledge of Ansys how to carry it out. That said, I do not see an
accurate way to depict the restraints on the "large mass." In
reality, the large mass pivots on an axis and we are only interested
in the stresses generated at the peak acceleration immediately after
the impact as the mass begins to pivot. I guess, I would have to
restrain the large mass to prevent the pivot motion to get a
solution. Or is it possible to run a fixed time dynamic solution
that captures the stresses during the initial moments of acceleration
right after impact?
-Paul
Paul Anschel
Magneti Marelli Powertrain
paul.anschel@m...