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Sharlotte Kramer's picture

The 3rd Sandia Fracture Challenge is here!

The third Sandia Fracture Challenge is here!  We invite to you participate in this next installment of our collaborative, blind assessment of predictions of ductile fracture.  For the third SFC, we wanted to challenge the computational mechanics community to predict ductile fracture in an additively manufactured structure.

WaiChing Sun's picture

PhD student or Postdoc Position available at Columbia University

A PhD or postdoc position is available in  computational multiscale modelling of geological materials at my research group.Interested candidates please visit for general information. Answers of general admission question can be found at  

WaiChing Sun's picture

EMI San Diego Mini-symposium on Geomechanics (MS61)

Dear colleagues, 

We would like to invite you to submit abstracts for our mini-symposium (MS61) on Computational Geomechanics in the upcoming EMI conference (June 4-7, 2017) at San Diego. The scope of the mini-symposium is listed below:

Lazuardi Pujilaksono's picture

Fatigue crack propagation

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Hi, I'm trying to perform a supposedly-simple experiment on fatigue crack propagation of UHMWPE. I use a compact-tension specimen on a servopulser hidraulic testing machine. I will try to do the experiment on a fix Pmax with a varied force ratio (R) from 0.1 to 0.5. I'm having trouble in deciding the maximum force Pmax. How does one decide the amount of force applied for FCP testing? Calculation steps and so on.

Plasticity model in Abaqus to capture the continues plastic strain of granular material under triaxial cyclic loading?

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I am working on modelling ballast aggregates under triaxial loading. Confining pressure applied in the intermediate and minor principal direction and cyclic compression load applied in the major principal axis direction. I wanted to capture the continues plastic strain (PS) with cycles (N). My test results show that the PS increase with N up to about 10,000 cycles and the rate of strain slowly diminish for later cycles and almost stay constant after N=100,000. What available model in Abaqus can be used to get this behaviour. I have to run my analysis at least for 10,000 cycles.

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!


Potential surface and yield surface


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.


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 ).

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 ).

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 

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



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.


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