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Plasticity

What is the basic difference between Deformation theory and flow theory of plasticity ?

I am familiar with the flow theory version of the plasticity theory but still quite confused with the deformation theory version of the same.

When a material is modeled using a non-linear elastic model to predict its plastic behavior with no distinction between the elastic and the plastic strain, is it a deformation theory in that case?

Any elaboration in this regard would be really helpful.

Thanks in advance. 

ABAQUS VUHARD subroutine problem

Hello

I am working on the simulation of ring rolling. I have written the subroutine for the plasticity part in the subroutine VUHARD and have set the PLASTIC part in material definition to USER.
I dont have HARDENING PROPERTIES so i have set it BLANK. i have set the path of the subroutine in the job defintion part too. But abaqus crashes whenever i try to do DATA CHECK
It says ABAQUS KERNEL EXITED WITH AN ERROR.I dont know why this problem arises?. I am stuck.

Designing copper–zirconium based nanowires for improving yield strength and plasticity via configuring surface atoms

Following our previous work on Cu-Zr nanowire system, in this paper we have shown improvement in various thermo-mechanical properties of nanowire via manipulating the surface atoms. The paper titled "Designing copper–zirconium based nanowires for improving yield strength and plasticity via configuring surface atoms" by Vijay Kumar Sutrakarand D Roy Mahapatra has been published in Journal of Nanoparticle Research. The paper can be downloaded from
http://www.springerlink.com/content/j2786222101mn711/

Amit Acharya's picture

Anisotropic yield, plastic spin, and dislocation mechanics

(This paper is to appear in the IUTAM Procedia on "Linking scales  in
computations: from microstructure to macro-scale properties," edited by
Oana Cazacu)

Amit Acharya, S. Jonathan Chapman

Manaliac's picture

Tensile test under LS-DYNA

Dear all,

I would like to run a tensile test under ls-dyna of a mild steel  and
apply a 7000 N load to the dog bone specimen on a explicite scheme.

Unfortunately, I
have wild deformations ( and an error) on the nodes on edges where the
load is applied, so can you please tell me what are the importants
constants (like time termination, mass scale,...) and how to perform a
perfect run?

 

Have a good day,

 

Thank you

M.

PhD position at Loughborough University: 'Plasticity in small length scales'

As one of the biggest Departments of its kind in the UK, the Wolfson School of Mechanical and Manufacturing Engineering has an international reputation for being at the forefront of technological innovation and for maintaining extensive links with industry.

http://www.lboro.ac.uk/departments/mm/index.html

Hisham's picture

Literature for Multi-surface plasticity

Dear all,

 

Can someone please guide me to comprehensive literature for implementing multi-yield surface plasticity in numerical codes. I am not sure if I, properly, understand the algorithm.

 

Thanks in advance

Best regards,

Hisham 

 

SYSTEM GOT SHUTDOWN WHILE RUNNING ABAQUS

Hi all,

         My system got shutdown while running a job in Abaqus.15 Gb odb file was generated and now I am not able to open the odb file.It is saying some error about the format.Have anyone came across such a problem.

Pls help me

SHIBIN

Zhiqiang Wang's picture

Abstract deadline extended: August 15. ISCM III, Taipei, December 2011, Minisymposium of "Multiscale Methods in Plasticity"

Abstract deadline extended to August 15, 2011 for ISCM III-CSE II in Taipei, Taiwan, December 5-7, 2011. Please submit your abstract to the minisymposium of "Multiscale methods in plasticity".

 ---------------------------------------

Ductile damage modelling in ABAQUS

Choose a channel featured in the header of iMechanica: 

Hi all

I am M.Sc. sutdent in Istanbul Technical University and my research subject is comparision of several ductile damage models both computationaly and experimentally.

I am trying to compare ductile damage models such as Freudenthal,Cockroft,Ayada ,Brozzo etc. computationally using ABAQUS and seeking a way to implement these damage models in ABAQUS.

To obtain each models damage result individually should damage model be implemented in ABAQUS or can a regular tensile test results be used for calculation of damage values.

Post-Doctoral Fellow in Computational Structural/Solid Mechanics and Design

Applicants are sought to fill a post-doctoral position in
computational solid/structural mechanics and design. The selected applicant will work
closely with Prof. Masoud Rais-Rohani and his research colleagues and graduate
students at the Center for Advanced Vehicular Systems (CAVS) in the Bagley
College of Engineering at Mississippi State University. Applicants must have strong background

Post-Doctoral Fellow in Computational Structural/Solid Mechanics and Design

Applicants are sought to fill a post-doctoral position in
computational solid/structural mechanics and design. The selected applicant will work
closely with Prof. Masoud Rais-Rohani and his research colleagues and graduate

In situ nanocompression testing of irradiated copper

Dear colleagues,

we recently published a paper on measuring bulk properties of irradiated copper from nanoscale samples:

http://www.nature.com/nmat/journal/vaop/ncurrent/full/nmat3055.html

Hope you find this interesting!

 

Daniel

In situ nanocompression testing of irradiated copper

Dear Colleagues,

we recently published a paper on measuring bulk properties of irradiated from nanoscale compression samples:

http://www.nature.com/nmat/journal/vaop/ncurrent/full/nmat3055.html

Hope you find this interesting!

 

Daniel

Kejie Zhao's picture

Lithium-assisted plastic deformation of silicon electrodes in lithium-ion batteries: a first-principles theoretical study

Silicon can host a large amount of lithium, making it a promising electrode for high-capacity lithium-ion batteries.  Recent experiments indicate that silicon experiences large plastic deformation upon Li absorption, which can significantly decrease the stresses induced by lithiation and thus mitigate fracture failure of electrodes. These issues become especially relevant in nanostructured electrodes with confined geometries.

Zhiqiang Wang's picture

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

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!

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