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Plasticity

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

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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).

Orthotropic plasticity model

Dear all,

Is there any one of you know a material model which can reflect the orthotropic , hysteresis, and load ratio dependence behaviors? 

Every helps would be highly appreciated.

 

Kindest regards,

Ken Dinh 

kourousis's picture

Mini-symposium 'Cyclic Plasticity Models for Sheet Metal Forming' - NUMISHEET 2014

Dear Colleagues,

I would like to invite to you to submit an abstract to the mini-symposium on 'Cyclic Plasticity Models for Sheet Metal Forming' at the 9th International Conference on Numerical Simulation of 3D Sheet Metal Forming Processes (NUMISHEET) to be held at Melbourne - Australia January 6-10, 2014 (http://www.numisheet2014.org). 

Jaafar El-Awady's picture

Pre-straining effects on the power-law scaling of size-dependent strengthening in Ni single crystals

Pre-straining effects on the power-law scaling of size-dependent strengthening in Ni single crystals

Jaafar A. El-Awady, Michael D. Uchic, Paul A. Shade, Sang-Lan Kim, Satish I. Rao, Dennis M. Dimiduk, Christopher Woodward

 

Volume 68, Issues 3–4, February 2013, Pages 207–210

 

Piriform yield surface

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