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Tine van Nunen's picture

Job Opportunity Saint-Gobain R&D Center - Senior Research Engineer

Saint-Gobain job opportunity:

Senior Research Engineer I

Competency Research Labs – Engineering Mechanics

Saint-Gobain R&D Center, Northboro, Massachusetts, USA

Reference number: 522087

Apply online for this job or check out our other career opportunities!

www.saint-gobain-experience.com/en/career-opportunities

WHO WE ARE:

Potential surface and yield surface

Hello,

Would you please tell me the basic difference between potential plastic surface and yield surface with a physical meaning, if possible. I know that if both the surfaces match, then it is associated flow-rule, otherwise it is a non-associative flow rule.

I know that this is a very basic question, but I am facing difficulty in completely understanding it.

 

Thanks in advance.

-Shivani

Hashem Mourad's picture

Post-doctoral Position in Theoretical and Computational Solid Mechanics at Los Alamos National Laboratory

The Fluid Dynamics and Solid Mechanics Group (T-3) at Los Alamos National Laboratory is currently seeking outstanding candidates for a post-doctoral research position in the areas of solid mechanics, constitutive modeling, computational methods, and multi-scale modeling and simulation techniques. The prospective candidate is expected to take part in theory and computational method development for the effective representation of plasticity, damage and failure in solid materials.

pastewka's picture

CECAM Workshop "Chemical and structural transformations in materials under mechanical load"

We are pleased to announce a 4-day CECAM/Psi-k Workshop on

"Chemical and structural transformations in materials under mechanical load",

 that will take place at the EPFL campus in Lausanne from Tuesday 1st September to Friday 4th September 2015.

Fifth Biennial Workshop on Direct Methods

The fifth biennial workshop on 'Direct Methods' will be held in Oxford, UK on 6th to 8th September 2015.  It follows on from previous successful workshops held in Aachen, Lille, Athens and Reggio Calabria (see http://www.iadime.unirc.it/ ).

Fifth biennial workshop on Direct Methods

The fifth biennial workshop on 'Direct Methods' will be held in Oxford, UK on 6th to 8th September 2015.  It follows on from previous successful workshops held in Aachen, Lille, Athens and Reggio Calabria (see http://www.iadime.unirc.it/ ).

Amit Pandey's picture

Mechanical responses and deformation mechanisms of an AZ31 Mg alloy- Part 2

Recent paper is Part-2 of the paper mentioned below

 http://imechanica.org/node/10104 

http://www.sciencedirect.com/science/article/pii/S0749641910001142 

Mechanical responses and deformation mechanisms of an AZ31 Mg alloy sheet under dynamic and simple shear deformations

 

Abstract

Alejandro Mota's picture

2nd Call for Abstracts: USNCCM13 Minisymposium 414 on Recent Advances in Mesh Adaptivity for Inelasticity, Damage, Crack Propagation and Failure.

In this minisymposium we seek to highlight challenging problems in computational solid mechanics that require mesh adaptation methods for their solution. We focus on the finite element method and works that address large deformations and the accompanying inelasticity, damage, crack propagation and failure. Discussion will center on Lagrangian descriptions and determining the necessary computational components to resolve, preserve, and evolve the fields that govern these processes. Prototypical material systems may include, but are not limited to, ductile metals and biomaterials.

Yannis Korkolis's picture

McMAT 2015 symposium on materials and manufacturing

We would like to invite your contribution to Symposium #18: “Experiments and Constitutive Modelling of Materials in Advanced Forming Processes” in the upcoming ASME 2015 Applied Mechanics and Materials Conference, McMAT2015, to be held in Seattle on June 29-July 1, 2015.

Alejandro Mota's picture

Call for Abstracts: USNCCM13 Minisymposium 414 on Recent Advances in Mesh Adaptivity for Inelasticity, Damage, Crack Propagation and Failure.

In this minisymposium we seek to highlight challenging problems in computational solid mechanics that require mesh adaptation methods for their solution. We focus on the finite element method and works that address large deformations and the accompanying inelasticity, damage, crack propagation and failure. Discussion will center on Lagrangian descriptions and determining the necessary computational components to resolve, preserve, and evolve the fields that govern these processes. Prototypical material systems may include, but are not limited to, ductile metals and biomaterials.

Interim replacement at CEA/Saclay, France

Five-month temporary assignment starting from the beginning of March 2015, in Service de Recherches de Métallurgie Physique, CEA/Saclay (France).

Title of the project: Ab initio modeling of dislocations in body-centered cubic metals.

Research area: Solid State Physics, Material Science

ahmed.hussein's picture

Microstructurally based cross-slip mechanisms and their effects on dislocation microstructure evolution in fcc crystals

Three newly identified cross-slip mechanisms from atomistic simulations of fcc crystals, namely surface, bulk and intersection cross-slip types, were hierarchically informed into discrete dislocation dynamics simulations. The influence of each cross-slip type on the evolution of the dislocation microstructure in face-centered cubic microcrystals having different crystal sizes and initial dislocation densities was investigated.

How obtain tension strain concrete(σt0) in damaged plasticity model in ABAQUS?

Choose a channel featured in the header of iMechanica: 

How obtain tension strain concrete(σt0) in damaged plasticity model in ABAQUS?

hello engineers

i need help about concrete damaged plasticity

fo example :

if Compressive stress (Fu)= 51.2 MPa

and tension stress (σ t)=0.3 x 51.2^(2/3)=4.136

1)why (σ t) is 2.36 in picture(uploaded)?

2)what is tension strain ? and how? i cant understand.

i cant obtain εt = total tensile strain.

how obtain εcr ?

please help

 

Zhigang Suo's picture

FRAME INDIFFERENCE

The attached notes are written for a course on plasticity.  When I update the notes, I will post a link on my twitter account:  https://twitter.com/zhigangsuo.

Shailendra's picture

Symposium at 2015 Mach Conference

Dear Colleagues:

We are organizing a symposium titled "To Yield or Not to Yield: Multiscale Perspectives in Plasticity and Failure of Materials" at the 2015 Mach conference, which will be held in Annapolis, MD, USA during April 8-10, 2015.  We cordially invite you to participate in the 2015 Mach Conference by giving a talk in our symposium.

Zhigang Suo's picture

Rigid-plastic flow

The attached notes are written for a course on plasticity.  When I update the notes, I will post a link on my twitter account:  https://twitter.com/zhigangsuo.

Zhigang Suo's picture

Nonlinear viscosity

The attached notes are written for a course on plasticity.  When I update the posts, I will write a note on my twitter account:  https://twitter.com/zhigangsuo.  

Matt Pharr's picture

Variation of Stress with Charging Rate due to Strain-Rate Sensitivity of Silicon Electrodes of Lithium Ion Batteries

Silicon is a promising anode material for lithium-ion batteries due to its enormous theoretical energy density. Fracture during electrochemical cycling has limited the practical viability of silicon electrodes, but recent studies indicate that fracture can be prevented by taking advantage of lithiation-induced plasticity. In this paper, we provide experimental insight into the nature of plasticity in amorphous LixSi thin films. To do so, we vary the rate of lithiation of amorphous silicon thin films and simultaneously measure stresses.

Zhigang Suo's picture

Viscosity

The attached notes are written for a course on plasticity.  I will update new posts on my twitter account:  https://twitter.com/zhigangsuo.  

Zhigang Suo's picture

Strain hardening

The attached notes are written for a course on plasticity.  I will update new posts on my twitter account:  https://twitter.com/zhigangsuo.  Rheology is the science of deformation. This science poses a question for every material: given a history of stress, how do we find the history of strain?

Zhigang Suo's picture

Plasticity

I am teaching this course this semester.  I'll post notes as I write them.  Links to the notes are listed in this post.  I will also notify updates on twitter:  https://twitter.com/zhigangsuo

Soud Choudhury's picture

Abaqus is not reporting any CEEQ in coupled temp-displacement step

Hi all,

I am modeling a simple coupled temp-displecment analysis with the following step information:

** MATERIALS

** 

*Material, name=Material-1

*Conductivity

 1e-06,

*Creep, law=HYPERB

44000., 0.005,   4.2, 45000., 8.314

*Elastic

60000., 0.34

*Expansion, zero=25.

 1.4e-05,

*Plastic

20.,  0.

60., 0.1

** 

** PHYSICAL CONSTANTS

** 

*Physical Constants, absolute zero=-273., universal gas=8.314

** STEP: Step-1

** 

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