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Modeling of large strain deformation in Abaqus

Submitted by hadi on
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Hi everybody,

I'm trying to model large strain deformations in Abaqus by writing a user defined material code in order to implement the governing constitutive equations of the material. As far as I know, Cauchy stress tensor should be used in the model to presume non-linear finite elements, but I don't know how one can implement Cauchy stress tensor in a UMAT used by Abaqus.

Thanks,

Hadi

An inverse-pole-figure method for analysis of polycrystalline ferroelectrics/ferroelastics

Submitted by Faxin Li on
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 Recently, enlightened by the definition of inverse pole figure in Materials Science, I proposed an inverse-pole-figure (IPF) method for analysis of domain switching in polycrystalline ferroelectrics/ferroelastics.

How to define a displacement rate as a pressure uniform load?

Submitted by Gadoo on
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Computational Mechanics Forum
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Abaqus 6.7-1



Dear All,

I would like to simulte a 2-d tension test which has been conducted using a displacement rate 1mm/min till failure. Can some one explain how to define this displacement rate using Abaqus 6.7? Also, I would ask another question, can this displacement rate be considered as a vilocity? and can be modeled as a velocity field?

Regards,

M. G. H

McGill University, Canada 

Modeling masonry in ABAQUS

Submitted by dhruba on
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I am quite new to ABAQUS and trying to model structural masonry.I am facing difficulties in defining material property and analysis procedure.I was wondering if anybody has worked on this particular area and provide me with some useful resources.

 Any Help in this regard will be highly appreciated

Thanks and Regards,

Dhruba

Mechanics of buckled carbon nanotubes on elastomeric substrates

Submitted by Jianliang Xiao on
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Carbon nanotube
buckling
elastomeric substrate

We have studied the scaling of controlled nonlinear buckling processes in materials with dimensions in the molecular range (i.e., ～1 nm) through experimental and theoretical studies of buckling in individual single-wall carbon nanotubes on substrates of poly(dimethylsiloxane). The results show not only the ability to create and manipulate patterns of buckling at these molecular scales, but also, that analytical continuum mechanics theory can explain, quantitatively, all measurable aspects of this system.

Strong and Ductile Colossal Carbon Tubes with Walls of Rectangular Macropores

Submitted by Jianyu Huang on
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porous colossal carbon tubes
mechanical and electrical properties

PRL 101, 145501 (2008)      http://www.nature.com/news/2008/081010/full/news.2008.1164.html, http://www.sciencenews.org/view/generic/id/34974/title/Carbon_tubes,_bu…

efg method

Submitted by venkata_krishna on
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efg 1d program

Dear Prof. Dolbow

 In your 1D efg program, you have used u=d(1:nnodes). I think, you should calculate "u" by summing after multiplying with the shape functions and "d". Because in the figure 2 phi(x) is not equal to one at the node. Phi(x) satisfies the partition of unity.

Please clearify my doubt if I am wrong.

Best regards

krishna

venkatakrishnaraop [at] gmail.com (venkatakrishnaraop[at]gmail[dot]com)   

Fatigue Crack Propagation Analysis by means of ANSYS

Submitted by Sanam Saebi on
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HI Every Body

 I am postgraduate student of NavalArchitecture, My thesis is Fatigue Crack Propagation in ship Industry, I want to use Ansys Software for this purpose, at first I generated a plate with a central Crack and did fine mesh around crack and saw the results, for next step I should propagate the crack, my questions are as below:

1. How we can predict the Crack path?

2. how should I growth the crack? shall I clear mesh and extend the crack or.....???? I don't know?

3. How Can I use from Interface Elements?

Surface Energies? Continuum Molecular Dynamics?

Submitted by Mike Graham on
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molecular dynamics
contact
contact mechanics
continuum molecular dynamics
Lennard-Jones
van der Waals force

I recently encountered the research of Phil Attard and others, in which the contact problem is solved, relaxing the restrictions of the traditional contact models (Hertz, JKR, DMT) and solving based on a formulation where the governing equations are derived using finite-range surface forces and calculated numerically, self-consistently.

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