It's pretty standard for shell elements to have multiple integration points
through the thickness at every in-plane integration point. Integrating the
response through the thickness allows you to represent the variation in the
nonlinear constitutive response of the material through the cross-section, and
come up with resultant quantities at the locations of the in-plane integration
points, which are then integrated using standard procedures.
I haven't really gotten too far into this yet, but I don't think accommodating
those extra integration points would involve changing how the integration rules
or data structures would work in libMesh. I think you would just evaluate
vectors of properties at the standard integration points, with each entry in
the vector representing a different point through the thickness. We are just
getting started on the path of developing shell elements in MOOSE, so our
group will be looking into how to handle this.
-Ben
On 11/14/18, 8:19 AM, "John Peterson" <jwpeter...@gmail.com> wrote:
On Tue, Nov 13, 2018 at 11:22 PM Yuxiang Wang <yw...@virginia.edu> wrote:
> Dear all,
>
> As one usually reads from literature (or commercial software
> documentation), usually, a shell element would need >= 2 Gaussian
> quadrature points through the thickness to capture its bending behavior.
> For example, in the LS-DYNA documentation
>
<https://urldefense.proofpoint.com/v2/url?u=https-3A__www.dynasupport.com_tutorial_ls-2Ddyna-2Dusers-2Dguide_elements&d=DwICAg&c=54IZrppPQZKX9mLzcGdPfFD1hxrcB__aEkJFOKJFd00&r=hn5akMybrkn-1oiQB8nm_y7trT_BOQm9jBgbzQWwxXA&m=d16wjsgwuY6Xejdr47KKgE8srFi-kHjT92yv6KeNbt0&s=XxuqMBzy7V7pzqu5KNGEyqWuMwh-JQEAJerwVZsdQFU&e=>
or
> mentioned in this paper
> <
>
https://urldefense.proofpoint.com/v2/url?u=http-3A__web.mit.edu_kjb_www_Principal-5FPublications_Performance-5Fof-5Fthe-5FMITC3-2B-5Fand-5FMITC4-2B-5Fshell-5Felements-5Fin-5Fwidely-5Fused-5Fbenchmark-5Fproblems.pdf&d=DwICAg&c=54IZrppPQZKX9mLzcGdPfFD1hxrcB__aEkJFOKJFd00&r=hn5akMybrkn-1oiQB8nm_y7trT_BOQm9jBgbzQWwxXA&m=d16wjsgwuY6Xejdr47KKgE8srFi-kHjT92yv6KeNbt0&s=tSn1-9z_P8T0uME2jwoYDUO7AQEElPc8f3IjxytF-EA&e=
> >
> .
>
I guess I'm confused about what you mean by "thickness". Our SHELL
elements are logically two-dimensional (have zero thickness) so IMO it
doesn't make sense ask about integration in the transverse direction...
--
John
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