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Problem with using Abaqus in Earthquake analysis

Submitted by maherelabd on Thu, 03/19/2009 - 12:57

Dear All,

I have a problem simulating earthquake effect on a very simple structure. The structure is a 2 story steel plan frame structure. with lumped mass at its corners.

I am applying the Northbridge earthquake on it but I am getting very strange results.

I am applying the Material density beside the lumped mass at corners.

Both, eignvalues and frequencies and also responses are not correct.

Problem of extracting structural damping

Submitted by chlif_med on Thu, 03/19/2009 - 10:57

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thin core

damping structure sandwich

Hello;

I have a problem of extracting structural damping coefficient of a sandwich plate type steel / polymer / steel. I have already entered the shear modulus of the polymer in ABAQUS G = G0 (iw) / (1 + iw) With the: *viscoelastic, frequency=TABULAR

I do not know if my approach is right?

My inp file has this form:

*NODE, NSET=ALLNODES, SYSTEM=R

*ELEMENT, TYPE=S4 , ELSET=THIN-SHELL1

*SHELL GENERAL SECTION,

ELSET=THIN-SHELL1 ,

ideas on mixed mode fracture criterion

Submitted by wailoonchan on Thu, 03/19/2009 - 03:47

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mixed mode fracture criterion

Hi,

I am starting my research on mixed-mode fracture criterion. Are there any interesting papers or books to read on?

Thanks.

Why Griffith's Law of fracture does not hold at the nanoscale

Submitted by ashfaqadnan on Mon, 03/16/2009 - 21:14

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We know from fracture mechanics theories that fracture instability in a perfectly brittle material occurs when energy release rate (G) becomes equal or more than two times the surface energy (γ) of that material. The value of G = 2γ is known as fracture toughness Gc. This is the classical Griffith criteria of brittle fracture. Experimentally, however, we know that plasticity becomes eminent for most materials and this criteria does not work.

Automatic Element removal

Submitted by manoochehr on Mon, 03/16/2009 - 01:38

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Hi everone,

The new version of ABAQUS/CAE 6.8 seem to have capability of automatic failed element removal. Does any body has any experience about this new feature in ABAQUS.

cheers,

Manoochehr

Element free Galerkin method

Submitted by Arun C O on Sun, 03/15/2009 - 16:33

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I would like to know whether any works have been done in EFGM which suggest the best points in the domain where the stresses have to be computed, like in FEM we do have Gauss points which give minimum error for secondary variables. So can any one please suggest some references in this regard?

Teeth Implant Finite Element Software

Submitted by immuslih on Sat, 03/14/2009 - 18:52

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I am looking for a Finite Element software for Teeth and Implant modeling and analysis. Is there a special FE software for this, or which of these softwares can solve the proplem.

Abaqus, ProEng, Ansys, catia, solidworks, or anyother software..

please, if you know about solving this problem, share your thoughts with me.. or send me a link to this kind of analysis...

thanks to all in advance...

Immuslih

XFEM

Submitted by christyleo on Sat, 03/14/2009 - 17:29

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Hi,

XFEM is a local partition of unity (PUM) enriched finite element method. By local, it means that only a region near the discontinuties such as cracks, holes, material interfaces are enriched. The most important concept in this methodis "enrichment" which means that the displacement approximation is enriched (incorporated) by additional problem-specific functions.