XANSYS Message: 23715 [Go back to message list]
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Subject: Re: Garvity Accelaration for Self Weight Analysis
Author: Karen Loiselet
Date: 2001-05-12 14:19:00

Hy
in fact in ansys you apply acceleration and not gravity, and so in ansys
when you apply acceleration it's like you take your element model and move
it in the direction and with the acceleration you specified, so it's normal
if you apply a +Y acceleration you will have a -Y deforme shape, basic
exemple: take your platic ruler (I don't know if it's the good word so the
object you use to draw right line) and if you move it with acceleration in
one direction you will have a deforme shape in the other direction, so ansys
shows the reality no?. So for gravity you must apply the acceleration in the
other direction.
An other thing, be careful with your unit problem if you use mm and not m
for your dimension.
Karen

Karen LOISELET
Composites Engineer
DYNE Design Engineering
http://www.dde.ch
Switzerland

----- Original Message -----
To:
Sent: Sunday, May 13, 2001 2:19 AM

> Hi,

> I am trying to analyze a cantilever beam deforming under self weight. I
> applied Gravity to get weight act on the body. Surprisingly Ansys
> behavior is found to be exactly opposite to that of theoretical one.

> Ansys shows deformation in +ve Y direction when acceleartion is applied
> in -ve Y direction and vice versa.

> Is this a correct behavior??? or Tell me where I went wrong in logic.

> As we take Y - Accelaration as -9.81 m/s^2 in theoretical calculations
> for physics problems, can we define acc in the same direction for such
> problem??

> Sandeep
> Pune - India

Posts possibly associated with message #23715AuthorDateScore
23712Garvity Accelaration for Self Weight Analysisfea user feauser@2001/05/12 
23714Re: Garvity Accelaration for Self Weight AnalysisRahul Hiwale2001/05/12 
23715Re: Garvity Accelaration for Self Weight AnalysisKaren Loiselet2001/05/12 
23790Re: Garvity Accelaration for Self Weight Analysisfea user feauser@2001/05/15 
23796Re: Garvity Accelaration for Self Weight AnalysisKaren Loiselet2001/05/15