Hi,
I am doing a FEA using shell elements, described by means of their
external skin. However, the code (Adina) considers the input geometry
as the midsurface of the element.

I have heard that some codes (Ansys?) take into account also the
possibility to set the described geometry as bottom or top skin of the
element. What do they change in these cases? Isn't the volume of the
shell computed anyway as area times thickness? And what about the
stiffness? Do they perform a sort of offset to shift the properties to
the midsurface?

Could anybody clarify these points to me?

Thanks in advance,
Paolo

Mark 2 of the Java codes is now available on the Google Group FDTD-OS

http://groups.google.co.uk/group/fdtd-os

hi this is vicky here .... can u tell me how to go about for analysis
of welding joint, some other method other than element birth and death
method .........what to use ....transient thermal analysis or steady
state ....any related link o explain me the exact steps
and ......method used in welding analysis

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Consider a column.

1) As the bending moemnt incraeses (keeping axial force
constant);bending stiffness "EI" reduces.

2) My question is that what is the effect if reducing "EI" on axial
stiffness "AE/l" (AE)

3) Should we reduce "AE" too?If so what amount?

Can we neglect the change in "AE" due to reducing "EI"

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The following link introduces a finite element method for evaluation of
in-situ stiffness and mass
http://www.equation.com/servlet/equation.cmd?call=june5

Are there other methods developed? Thanks.