Blog posts

problem using crystal plasticity model in Abaqus via UMAT

Submitted by shapoor on Wed, 04/27/2011 - 17:02

I am trying to model polycrystal behaviour using Abaqus Umat via crytalplasticity . My Umat results for single crystal & about 5 grain, are reasonable, but when, I try to use more than 5 grain in each integration point (polycrystal model) abaqus aborted with following message after about 15 increment:

Abaqus Error: The executable C:\SIMULIA\Abaqus\6.10-1\exec\standard.exe aborted with system error code 693...

I will be happy if someone guide me about this problem.

Help needed on VUINTER to define molecular interaction between two surfaces

Submitted by pphl on Wed, 04/27/2011 - 11:32

Hi,

Does anyone have any idea on using VUINTER to define adhesive contact between a hard body and a soft body (the potential between the two surfaces is molecular like van der waals or lennard-jones potential).

Coupling FEM and Monte Carlo

Submitted by hamed_amini on Wed, 04/27/2011 - 11:06

FEM

Kinetic Monte Carlo

I wnat simulat rollong process. Mteral deformation is simulated by FEM and i want simujlate microstructure evolution by KMC method. Do any one have experience in this field (coupling FEM and KMC) ?

Coupling FEM and Monte Carlo

Submitted by hamed_amini on Wed, 04/27/2011 - 11:02

research

FEM

Monte carlo

I want simulat micro strucure evolution in metal fromind, e.g. rolling. To capture grain growth or refinement, i use MC method and rolling process simulate by FEM method (ABAQUS). Do any one have experience in this field?

An interesting arXiv paper: "Precession optomechanics"

Submitted by Ajit R. Jadhav on Wed, 04/27/2011 - 07:26

Mechanics of Photonic Devices

Hi all,

Just thought that the following paper archived at the arXiv yesterday could be of general interest to any mechanician:

Xingyu Zhang, Matthew Tomes, Tal Carmon (2011) "Precession optomechanics," arXiv:1104.4839 [^]

The fig. 1 in it makes the matter conceptually so simple that the paper can be recommended to any mechanician for his general reading, and not only to a specialist in the field.

--Ajit

[E&OE]

Regarding JLTYP in DLOAD in Abaqus

Submitted by pphl on Wed, 04/27/2011 - 06:57

Hi,

Reference need for VUINTER, VDLOAD in ABAQUS

Submitted by pphl on Wed, 04/27/2011 - 05:12

Can someone please post some material/good links to get better understandng of using these subroutines (other than ABAQUS documentation itself).

Thanks in Advance.

quasi-static simulation

Submitted by uhyadav on Tue, 04/26/2011 - 14:02

software

hi,

i am working on crushing of thin-walled section. i want to simulate quasi-static crushing in LS DYNA. for that i did scale the mass, but somehow it is not showing the deformation. i get deformation of .03mm for tube of 90mm. what might have been gone wrong?

please help me.

thax

The 48th Annual Technical Meeting of Society of Engineering Sciences will be held October 12-14, 2011

Submitted by jqu on Tue, 04/26/2011 - 03:43

conference

SES 2011

The 48th Annual Technical Meeting of Society of Engineering Sciences will be held October 12-14, 2011 at Northwestern University Evanston, Illinois 60208, USA. 　The meeting will have 43 symposia covering a wide range of topics in engineering sciences.　 To learn more about the conference and submit an abstract, please check the conference webpage www.ses2011.org.

MODELING COUPLING EFFECTS IN CORD-RUBBER COMPOSITE STRUCTURES

Submitted by saberelarem on Mon, 04/25/2011 - 18:35

research

cord-rubber composites

analytical model

An analytical model is developed to study the coupling effects in
cord-rubber composite materials. The analytical model takes into account
the mismatch of stiffness between the cords and the rubber matrix
material, and the twist-extension coupling. The transverse deformation,
i.e., normal to the cords direction is based on the normal modes of a
special system which describes the orthotropic and the coupling
behaviour of cord-rubber composites. The equations of motion for the
cord-composite plates are derived using the principle of virtual work.
Results of deformation and stresses are obtained for some typical
cord-rubber composite plates and are compared to the existing solutions.
The results presented illustrate that the coupling effects are

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