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Subject: Re: Hex & Tet elements
Author: Roberto Muccini
Date: 1998-12-14 09:40:00Johan Hsu;(W)439-7624;1E09-100 wrote:
> From: "Johan Hsu;(W)439-7624;1E09-100"
> I don't have my book with me right now but I do remember that the Hex elements
> produce better result than Tet elements only when the edges of the Hex's form
at
> right angles.(4 degree either side?) In the other word, if the element is
> distorted 3 Tet's produce better result than a single Hex. Correct me if I
got
> it all wrong.
I think that in general you are right. Remember that well coditioning of
elements is a complex issue. You have many indicators (such as Jacobian
Ratio, Edge angles, Warping factor and so on) that every standard FE
package controls before executing any analysis.
Regards
Roberto Muccini
> J. Hsu
> > Date: Mon, 14 Dec 1998 10:20:40 +0100
> > From: Roberto Muccini
> > To: xansys@o...
> > Mailing-List: list xansys@o...; contact xansys-owner@o...
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> > Subject: [xansys] Re: FW: Hex & Tet elements
> > From: Roberto Muccini
> > Ng Siu Wai, Alex wrote:
> > > From: "Ng Siu Wai, Alex"
> > > -----Original Message-----
> > > From: Binxin Wang [SMTP:wangbinxin@h...]
> > >
> > > Sent: Friday, December 11, 1998 10:59 PM
> > > To: feusers@m...
> > > Subject: Hex & Tet elements
> > > Dear all,
> > > Can any one there provide any reference explaining theoretically why
linear
> > > Hex elements produce better results than Tet elements.
> > > Thanks in advance.
> > > Regards.
> > > Binxin
> > FE routines calculate results in a fixed number of points for each
> > elements (Gauss points) then average across the element. The accuracy of
> > results is function of the number of this points (then the interpolation
> > function order): e.g. if you have two points you can use a linear
> > function, if three a quadratic, ecc.
> > This are only few words about this matter. You can find exhaustive
> > explanation in every basic FE book.
> > For example:
> > Cook et al. "Concepts and applications of finite elemnt analysis",
> > second edition, John Wiley and Sons, New York 1981
> > Bathe et al. "Finite element Procedures in Engineering Analysis",
> > Prentice Hall, Englewood Cliffs 1982
> > Zienkiewicz et al. "The finite element method", Mc-Graw Hill Company,
> > London 1977
> > Hope this helps
> > Roberto Muccini
> > Muccini Roberto
> > Laboratorio di Tecnologia dei Materiali tel. +39-(0)51-6366864550
> > Istituti Ortopedici Rizzoli fax. +39-(0)51-6366863
> > via di Barbiano 1/10 e-mail:muccini@t...
> > 40136 Bologna, Italy
> Johan Hsu, MSME
> FEA Analytical Engineer
> SIEMENS Westinghouse Power Corp.
> Orlando, Florida
Muccini Roberto
Laboratorio di Tecnologia dei Materiali tel. +39-(0)51-6366864550
Istituti Ortopedici Rizzoli fax. +39-(0)51-6366863
via di Barbiano 1/10 e-mail:muccini@t...
40136 Bologna, Italy