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Principle of virtual work in case of a large plastic deformation

Submitted by swsyoon on
research

Hi, all

I have a question about FE formulation for a finite plastic deformation.

I'm a new on the ABAQUS, but how the ABAQUS deals with the plastic deformation

to solve the FE eqation? I think the software use the principle of virtual work and

I'm wondering how the software modify the virtual work term to take the plastic deformation into account (because of dissipation energy)

(Obviously, the formulation must be different with elastic model)

I appreciate your reply.

 

 

Continuity in the Plastic Strain Rate and its Influence on Texture Evolution

Submitted by Justin C. Mach on
research
finite deformation
viscoplasticity
Crystal plasticity
dislocation density
continuity

Classical plasticity models evolve state variables in a spatially independent manner through (local) ordinary differen- 

tial equations, such as in the update of the rotation field in crystal plasticity. A continuity condition is derived for the 

lattice rotation field from a conservation law for Burgers vector content—a consequence of an averaged field theory 

of dislocation mechanics. This results in a nonlocal evolution equation for the lattice rotation field. The continuity 

My Eprint papers

Submitted by Pi-Gang Luan on
research
 Hi,
These are my Eprint papers. Some have already been published as Journal papers, some have not.
I will discuss some of them here someday.
You can link to  http://arxiv.org/ and search my name Pi-Gang Luan in Physics [arxive: All], and these papers would be shown to you. There is an exception, my YBE paper ([Colored solutions of Yang-Baxter equation from representations of U_{q}gl(2)] ). In that case you should type [Pi-Gang Luan] instead of Pi-Gang Luan to find the paper.

Numerical Evaluation of Crack Tip Opening Displacement (CTOD)

Submitted by SIVAKUMAR M V N on
research

Hai All,

I want to know how to evaluate CTOD form the finite element nodal
values(displacements) that are obtained from the commercial software
ABAQUS.

I am using Elastic-Plastic model for the analysis. Can anybody help me in this regard.

thanking you in advance,

 

Regards,

Sivakumar

Bending and 2D Elasticity: Going Back in Time

Submitted by Ajit R. Jadhav on
research
textbooks
solid mechanics
elasticity
bending
couple stresses

The following is a (relatively minor) question which had occurred to me more than two decades ago. By now I have forgotten precisely when it was... It could have been when I was in my TE (third year engineering) at COEP. ... Or, perhaps, it was later on, when I as at IIT Madras (studying stress analysis on my own). ... I don't remember precisely when it occurred to me, only *how* it did---it was when I was poring over the first part of Dieter's book.



METAL CUTTING SIMULATION USING DEFORM 2D

Submitted by vijaysekar on
research
modelling and simulation

Dear All,

I am working on the simulation of the metal cutting process using DEFORM 2D.I need some

guidance on the software usage.How do we vary the feed rate / cutting speed for different

operations.Can you help.I am pursuing my PhD currently.Do you have a working manual of DEFORM 2D for metal cutting.

Wishes ,

 

VIJAY.

 

 

 

Indentation depth for sphere/limited elastic half-space

Submitted by Blaz on
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Indentation depth for sphere/limited elastic half-space

Hello,

 My problem is the following:

In clasical Hertz theory I was able to locate indentation depth for the case of sphere/elastic half space, which I will denote as d0. I am interested if there is a relatively simple solution for obtaining indentation depth (d1) if this half-space is limited, that is a sphere in contact with either of these three cases:

1. Semi-infinite cylinder of diameter W (sphere is in contact with the upper cylinder side)

2. Semi-infinite prism of side W (sphere is in contact with the upper prism side)

whirling of shafts

Submitted by Jayesh_Jain on
research

Hello,

I am doing a literature search on this topic. Particularly, I am interested in existing devices and techniques that are used in academia and industry to 1) avoid shaft whirl in rotating machinery under perturbed loads (e.g. rotor systems), 2) to come out of whirling mode if shaft starts whirling, 3) other techniques related to stabilizing shafts in general to reduce the resulting vibrations.

Any help would be greatly appreciated.

 Thanks.

Results of our academic investigation of the I-35W bridge collapse

Submitted by Roberto Ballarini on
research
I-35W bridge collapse

I attach an essay we wrote for a book that will be published by University of Minnesota Press titled "The city, the river, the bridge." The essay is a transcription of part of a public lecture I gave on infrastructure and on the bridge collapse.

After the bridge collapse there were several posts on Imechanica that included speculation about the cause of the collapse, including fatigue crack growth, lack of redundancy, etc.. Our investigation determined the collapse was a result of an undersized gusset plate that reached its plastic limit load. 

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