User login

You are here


Nanoscale Mechanics of the Solid Electrolyte Interphase on Lithiated-Silicon Electrodes

Hello Imechanica community, we have just published our study on the mechanics of SEI in Li-ion batteries. Please find the abstract and link as below. 



Multi-scale finite element modelling of magnesium medical devices

Applications are invited from suitably qualified candidates for two full-time Postdoctoral Researcher positions on the finite element simulation of magnesium orthopaedic implants. These three year fixed term positions are funded through a US-Ireland R&D Partnership Programme involving collaboration between the SFI Centre for Research in Medical Devices (Cúram), the NSF Engineering Research Centre Revolutionizing Metallic Biomaterials (RMB, USA), and the Nanotechnology and Integrated Bioengineering Centre (NIBEC, Northern Ireland).

Interested candidates should send a CV to

The start date for both positions is May/June 2017.

Nonlinear programming and closest point return plasticity

New article:  Nonlinear programming and closest point return plasticity

This article tries to justify the use of backward Euler stress updates.

-- Biswajit

Sharlotte Kramer's picture

Sandia Fracture Challenge: Survey

The Sandia Fracture Challenge (SFC) was issued in December 2016, and the SFC supplemental information became available in February 2017.  The predictions are due July 15th, 2017.  We would appreciate feedback from you regarding the Challenge prior to the return of the predictions.   Please email Sharlotte Kramer ( and Brad Boyce ( with (1) your intent to participate in this SFC and/or (2) any comments you may have on the Challenge.

Sharlotte Kramer's picture

Sandia Fracture Challenge Update

Supplemental information for the third Sandia Fracture Challenge (SFC) is now available!  We have compiled the supplemental information promised in the original information packet and some additional information based on questions we received from participants.  The supplemental information includes electron backscatter diffraction (EBSD) data on the Challenge geometry, additional base material tests, raw DIC images and examples of DIC analyses of base material tests, and additional boundary condition information.

Drucker Prager Plasticity model

Hi All,

I am trying to code the Drucker prager plasticity model for the 2D plane strain case using consistent tangent modulus. I am using C++, therefore I would appreciate if anyone could share relevant materials which I could use and preferrably for the 2D case so it is not unnecessarily complicated.


Postdoctoral Position in Mesoscale Plasticity






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

Choose a channel featured in the header of iMechanica: 

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?

Choose a channel featured in the header of iMechanica: 

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

To appear in Journal of the Mechanics and Physics of Solids

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. A geometrical description
of ingredients of the structure of metallic glasses using the concept of local order based on
Frank-Kasper phases and the notion of disclinations as topological defects in these structures is
proposed. This novel kinematics is incorporated in a continuum mechanical framework capable
of describing the interactions of disclinations and also of dislocations (interpreted as pairs of
opposite disclinations). 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

Choose a channel featured in the header of iMechanica: 

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


Subscribe to RSS - Plasticity

More comments


Subscribe to Syndicate