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
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
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
crystal level and going up to the macro-level (of an aggregate of
many crystals) by employing Hill's averaging techniques and his
The computational poromechanics laboratory in the Civil Engineering and Engineering Mechanics Department is seeking a PhD candidate for Fall 2014 semester. The sucessful candidate should have (1) a master degree in applied mechanics, geomechanics or related disciplines, (2) a strong background in engineering mathematics, continuum mechanics, finite element method and computational plasticity, (3) be proficient in C++ and FORTRAN code developments and (4) possess excellent communication skills. Knowledge in discrete element/attice Boltzmann method, geostatistics and multiscale modeling is a plus.
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.
Determination of the Minimum Scan Size to Obtain Representative Textures by Electron Backscatter DiffractionSubmitted by ystarase on Sat, 2013-06-22 23:09.
A Surface Stacking Fault Energy Approach to Predicting Defect Nucleation in Surface-Dominated NanostructuresSubmitted by Harold S. Park on Sun, 2013-06-02 19:29.
Recently accepted for publication in JMPS:
Our new paper entitled "Anomalous
plasticity in the cyclic torsion of micron scale metallic wires" has been
accepted by PRL
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?
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
Mini-symposium 'Cyclic Plasticity Models for Sheet Metal Forming' - NUMISHEET 2014 - Deadline ExtensionSubmitted by Kyriakos Kourousis on Sat, 2013-04-20 02:20.
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.
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 sectionSubmitted by Imme on Tue, 2013-03-05 13:55.
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).
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.
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).
Dear Colleague, we cordially invite you to participate in the Nanobrücken-Dresden Nanomechanical Testing Workshop at TU Dresden (Mar 20, 2013) and Fraunhofer IZFP Dresden (Mar 21-22, 2013). The workshop's main theme is nanomechanical testing applied to advanced materials and semiconductor devices, but the workshop is open to all aspects of nanomechanical research including in-situ experimentation and theory/simulation. The Call for Abstracts (Feb 8, 2013 submission deadline) and registration information can be found at the workshop's updated website: http://hysitron.com/nbdresden.
Pre-straining effects on the power-law scaling of size-dependent strengthening in Ni single crystalsSubmitted by jelawady on Sat, 2013-01-26 12:30.
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
Authors: B. Kraus, R. Das, B. Banerjee
Tunable Tensile Ductility in Metallic Glasses
D.J. Magagnosc, R. Ehrbar, G. Kumar, M.R. He, J. Schroers, D.S. Gianola
Scientific Reports 3 (2013) 1096
The new deadline for abstract (plain text, 400 word limit) submission is now January 28, 2013.
The 4th conference "Nonlinear Dynamics -2013" will be held from 19 until 22 June, 2013 in Sevastopol (Ukraine).
Conference web-site: https://sites.google.com/site/ndkhpi2013/home
The conference is organised by:
- National Technical University "KhPI" (Kharkov, Ukraine)
- McGill University (Montreal, Canada)
- Institute of Mechanics, National Academy of Sciences of Ukraine (Kiev, Ukraine)