Blog posts

Modeling bone and implant

Submitted by Linping Zhao on Tue, 04/07/2009 - 20:10

I'm working with multiple meshed items and attempting to cut them using the Instance boolean operation. My parts include parts I've sketched & meshed in Abaqus and a 3D object I imported from MIMICS (.inp file). When I attempt to selectively cut the instances that overlap, Abaqus failed. Any suggestions on the modeling of bone and implant with a reasonable fit in geometry?

bad natural frequency

Submitted by chlif_med on Tue, 04/07/2009 - 10:28

research

viscoelasticity

composite

HELP FOR SYSTEM ERROR CODE 144 WHILE USING UMAT WITH ABAQUS

Submitted by unsrohith on Tue, 04/07/2009 - 07:43

Hi ,

Can anyone please give the appropriate reason why this system error code 144 comes while using UMAT with abaqus and how to resolve it.

ROHITH

comments on second page

Submitted by Rui Huang on Tue, 04/07/2009 - 02:55

iMech

I just noticed a new problem with imechanica: when a blog entry has received too many comments, additional comments will be placed on a second page but not linked properly. For example, the comment, "Work-free isochoric deformation", has a link node/5014#comment-10406 , which leads to the original blog entry rather than the comment. One can find the comment either by scrolling all the way down to the bottom of the page and then clicking "Next" or by a direct link, node/5014?page=1.

Composites modeling

Submitted by spankajkolhe on Tue, 04/07/2009 - 02:45

education

Composite modeling

Hi i want to model a compsoite shaft of glass/epoxy .i am having all material properties .i want to know how to model it .and in another case there is adhesives between the two.

Thanks,

pankaj

The essential assumption of Cauchy Stress

Submitted by Xu Guo on Tue, 04/07/2009 - 01:00

The essential assumption of Cauchy Stress

is the existence of the limit (\Delta f)/ (\Delta A) as \Delta A-->0.

This means that a infinitesimal small area can only sustain infinitesimal

small surface force. Therefore in the framework of conventional continuum

mechanics, we can only talk about the "force density (stress)" at a point.

The expression int_A (f.n)dA has no physical meaning. Only int_A (stress.n)dA

can give the total force exerting on a closed surface A.

a point and a particle

Submitted by Rui Huang on Mon, 04/06/2009 - 15:22

opinion

continuum mechanics

atomistic modeling

An XFEM/level-set method to model nanostructures

Submitted by Julien Yvonnet on Mon, 04/06/2009 - 09:21

research

In the attached paper, we propose a procedure combining an XFEM/level-set technique and Gurtin-Murdoch surface elasticity to model nanostructures with arbitrary geometries. The effects of free surface which are dominant at small scales are easily captured in this framework.