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Plasticity

Multi-scale modeling of plastic deformations in nano-scale materials; Transition to plastic limit

Despite the controversial debates concerning a unified theory, the continuum plasticity has evolved during the last few decades and an uncountable number of articles has been published on the subject. The proposal of Lee to decompose the deformation gradient, F, into elastic part Fe and plastic part Fp (i.e. F=FeFp) combined with the principle of maximum plastic dissipation is used in many publications to formulate the ensuing developments.

Amit Acharya's picture

A microscopic continuum model for defect dynamics in metallic glasses

Amit Acharya                       Michael Widom

Motivated by results of the topological theory of glasses accounting for geometric frustration,
we develop the simplest possible continuum mechanical model of defect dynamics in metallic
glasses that accounts for topological, energetic, and kinetic ideas. The model is aimed towards
the development of a microscopic understanding of the plasticity of such materials. We discuss
the expected predictive capabilities of the model vis-a-vis some observed physical behaviors of
metallic glasses.

kourousis's picture

PhD position in Additively Manufactured Metals Plasticity (Extended Deadline: 17 June 2016)

PhD Studentship (4 years) @University of Limerick

Cyclic Plasticity of Additively Manufactured (AM) Metals: Experimental Investigation & Constitutive Modelling

Background & Research Objectives

Karol Frydrych's picture

Polycrystal plasticity in Abaqus/Explicit

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Hello everyone!

My goal is to model large plastic deformations of polycrystalline metals using crystal plasticity and ALE adaptive meshing. In order to do that I want to use VUMAT subroutine in Abaqus/Explicit, since as far as I understand Abaqus/Standard is not good for large deformations and it doesn't support ALE adaptive meshing for that purpose.

Please suggest self study book for continuum plasticity theory

Hello, I am new to theory of plasicity and need to learn it by myself. Please suggest a good book for self study for continuum plasticity theory. I am specially interested in metal plasticity theories, in analytical and numerical aspects.

Kamyar M Davoudi's picture

(Course) Plastic Deformation in Crystalline Solids

Instructor: Kamyar Davoudi

Lectures: Saturdays and Mondays, 10:30 am-12:00 pm

Institute: Sharif University

 

Implementation of JH-2(Johnson holmquist) constitutive equation in explicit FEM

Dear professionals,

I'm self-developing explicit 3-D hybrid FEM/DEM code using GPGPU for my research regarding Penetration of projectile into rock.

In the code, I'm incorporating JH-2(Johnson holmquist) constitutive model.

Although this constitutive mode has been implemented in LS-DYNA and Abacus Explicit, some implementation detail has not been geven in exsisting literature. I mean, I reviewed several literature but I only found a flowchart of implementation of JH2 from Table 1 in

Xiaoding Wei's picture

"Imperfection" in graphene oxide invites surprising properties in a mechano-chemical way

In an article published in the August 20 issue of Nature Communications, we report a mechanochemical phenomenon in graphene oxide membranes, covalent epoxide-to-ether functional group transformations that deviate from epoxide ring-opening reactions, discovered through nanomechanical experiments and density functional-based tight binding calculations.

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?

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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

 

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