Plasticity
Postdoc position available in Compuational Materials Modeling
The Department of Materials Science and Engineering in the College of Engineering at the University of North Texas (UNT) seeks highly qualified applicants for a postdoctoral researcher position in computational materials modeling. The successful candidate will work on multiscale modeling of defects and microstructures (e.g., dislocations, grain boundaries, etc), and damage and failure of materials to design and evaluate advanced superalloys for aerospace applications, as part of the federally-funded research program in the Institute for Science and Engineering Simulation (ISES).
DEM modelling of granular flow
Hi iMechanica,
I want to start a discussion on the current status of DEM modelling of granular media. I know that Luding has published many papers in this area. Please add to the current research on granular flow modelling like viscoplasticity, hypoplasticity etc and the numerical DEM methods.
Modeling Metal forming in Abaqus...
I'm currently working on my master thesis which is in the area of metal
forming simulation...
I have one question,,, when adding material plasticity in Abaqus using the
power law...
to what limit shall i go in the tabulated form is it to 100% plasticity or
to the maximum strain the material can take...
in other word,,, if the power law is: σ =250*εp^0.123...
shall i inter the values till at σ=250, ε=1... or shall i stop at let say ε=0.25...
Regards,,,
Was
Lemaitre and Caboche mixed hardening model
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Hi,
I'm working in a cyclic loding metal deformation, and I'm interesting about mixed hardening models.
I need help to know what is the "Lemaitre and chaboche(1990)" mixed hardening model, do enyone know? Is similar to the Amstrong-Frederic model??? How is represented the isotropic hardening?
Thanks!
UEL
Dear Friends,
I have written a UEL for Strain Gradient Plasticity and is working well when i give Boundary condition as Concentrated force, But when i apply displacement boundary condition the it leads to 'system error 144'.
Iknow that system error 144 corresponds to division by zero or infinity, but then why it is coming in on displacement boundary condition is i am worried about.
I will be extremely helpful to anybody for any type of help on above problem.
Thanking you in advance
Soham
Measurements of Geometrically Necessary Dislocation Densities on Individual Slip Systems
We have recently published a paper on measurements of the density of geometrically necessary dislocations (GND) associated with wedge indentation of a single face-centered cubic crystal. The deformation field is two-dimensional and there are three effective in-plane slip systems that contribute to the plastic slip. We determine the lower bound on the total GND density with a three micrometer spatial resolution. We also show that in certain regions of the domain, the lower bound on total GND density corresponds to the exact total GND density.
Evoution of Yield surfaces: Past and Future Trend - Simulation
On the three-dimensional Filon construct for dislocations
(to appear in the Intl. Journal of Engineering Science)
Robin J. Knops and Amit Acharya
Crack Initiation with UMAT
Dear all,
I want to model crack initiation and propagation for a user defined material, using Abaqus. When I try to model , I get the following error:
A MATERIAL PROPERTY THAT IS NOT ALLOWED WITH A USER MATERIAL HAS BEEN SPECIFIED
when I take out critical damage initiation, the model works fine; which means that it doesnt allow me to couple UMAT with crack initiation. Does anyone know how to handle this problem?
All the best,
Panos