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Plasticity

Amit Pandey's picture

Negative to positive strain rate sensitivity in 5xxx series aluminum alloys

In continuation to our previous work on 5xxx series Al alloys

Experimental and numerical investigations of yield surface, texture, and deformation mechanisms in AA5754 over low to high temperatures and strain rates
node/14353

Julian J. Rimoli's picture

Educational iPad app on structural mechanics

I would like to share with fellow mechanicians an educational iPad app I recently developed. The name of the app is Truss Me! and the main goal is to help students, all the way from high school to college, to build intuition on how truss structures behave. The video below highlights some features of the app:

Hierarchical Materials Symposium at USNCTAM 2014 - Abstract deadline is now January 6, 2014

Dear Colleagues,

 

The submission deadline for abstracts to the 17th U.S. National Congress on Theoretical & Applied Mechanics has been extended to Jan 6th, 2014.  Please consider submitting an abstract to at the website below.  We will be holding a symposium on "Elasticity, PLasticity, and Multiphysics of Hierarchical Materials: Mechanisms to Mechanics" that many of you should find quite interesting!

https://www.egr.msu.edu/conference/

 

Amit Acharya's picture

Continuum mechanics of the interaction of phase boundaries and dislocations in solids

Amit Acharya         Claude Fressengeas

(To appear in Springer Proceedings in Mathematics and Statistics for Workshop on Differential Geometry and Continuum Mechanics held at the Intl. Centre for Mathematical Sciences in Edinburgh, 2013. Ed: G. Q Chen, M. Grinfeld, R.J. Knops)

dabiao liu's picture

search for Petch's classic paper entitled "The cleavage strength of polycrystals"

Recently, I am reading several classic works on crystal plasticity. But, it seems to be difficult for me to obtain several very old papers in this area. For example, one of the classic papers on Hall-Petch relation,

Petch, N.J., The cleavage strength of polycrystals. The Iron and Steel Institute, 1953, 174: 25-28. I have tried many ways to get the original paper, but I finally failed. Could someone please send me a copy of this paper? Thanks a lot. Here is my email: dbliu2009@gmail.com 

A question on plasticity

Recently, I have a question on the plasticity.As the plastic materials undergo the loading and unloading process. we can find the energy dissipation from the stress and strain relation curve. Then, my question is that the energy dissipation is generated during the loading process or unloading process?Thank you very much.

 

Plasticity and non-Schmid effects

If slip is the only mechanism of
plastic deformation of a crystal and Schmid law governs the slip
activity, the overall response of an aggregate of such crystals
features the normality rule of classical plasticity, see
node/15347
for a rigorous recent proof. Any deviation from Schmid law is
referred to as a non-Schmid effect. In general, these effects may be
of two kinds: in addition to the resolved shear stress (on a slip
system), other stress components may influence slip activity or/and
the hardening of a slip system (representative examples for each kind
are described, for example, in Qin and Bassani(1992) and Spitzig

Plastic Spin

In the classical (rate-independent)
theory of metal plasticity, the plastic spin has been an issue of
research and debate for about thirty years. Judging by the content
of current publications on the topic (regarding modeling
possibilities, consequences and applications), it seems that the
concept has acquired a certain degree of acceptance, although no
rigorous justification, at theoretical level, has ever been provided.
In the attached preprint this matter is investigated starting from

Varying Yield Strength through depth in Abaqus

Hi,

I am trying to create a material model in Abaqus such that I have a varying yield strength through the depth (y-coordinate). I want a model which has maximum yield strength at the top surface and gradually goes on decreasing with y-coordinate. Is there a way to do this? Any help/insight would be greatly appreciated. Thank you.

Regards,

Deepak Patil

Defining plasticity in ABAQUS

Free Tags: 

Hi all,

I am using Abaqus to simulate the behavior of a steel connection using a Static,General analysis. For bolts, the last values ​​for yield stress and plastic strain are 1 and 0.05, respectively.After running the model, I get values ​​of equivalent plastic strain in the bolts of 0.15.

Why do I get values ​​that are higher than the ones I define? Shouldn't I get a maximum of 0.05?  What can I be doing wrong?

Thank's,

Paulo Freitas

Post-Doctoral Opening on Multiscale Modeling of Materials

We are seeking to hire outstanding candidates for a post-doctoral research position in

the Koslowski’s group at Purdue University to work on dislocation dynamics and/or

continuum modeling of plasticity. The project involves developing and applying

numerical methods to study creep and plastic deformation in nano and ultrafine

crystalline materials. Successful candidates will have the opportunity to interact with a

wide range of experimentalists and theoreticians in academia, industry and national labs.

Ansys divergence

Hello All,

I have a question regarding Ansys solution divergence in nonlinear static analysis, with geometry and material nonlinearities. In this case the model is shell but that should ba valid for bricks as well.

Material Modelling

Hi all,

      I doing modelling on soft clay behaviour which exhibit softening behaviour during constant strain loading. Here i followed a non-associated flow rule for better prediction of dilation . For the case of non-associated flow rule yield function and plastic potential function should not same i clear in that , my doubt is that we can use two different surface for yield and plastic potential function (eg: linear surface as yield surface and elliptical surface as plastic potential )? 

Analytical elastic-plastic solutions for the torsion of a round bar with a heterogeneous cross section


Hello,


I am trying to derive/find an analytical expression
for the torsion of a round bar made of an heterogeneous material. But I just do
not seem to find any solution available in the literature other than for a
homogeneous material, which can be find in any theory of plasticity book (e.g.
Theory of Plasticity, 3rd Ed., J. Chakarabarty, pp. 132-136).

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