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WaiChing Sun's picture

Journal Club Theme of September 2014: Numerical modeling of thermo-hydro-mechanical coupling processes in porous media

Thermo-hydro-mechanics (THM) is a branch of mechanics aimed to predict how deformable porous media behave, while heat transfer and fluid transport simultaneously occur in the pores filled by liquid and/or gas. Understanding these multi-physical responses is important for a wide spectrum of modern engineering applications, such as tissue scaffolding, geothermal heating, mineral exploration and mining, hydraulic fracture, energy piles, tunneling with frozen soil and nuclear waste storage and management.

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Tenure-Track Faculty Position in Computational Mechanics - The George Wasgington University

The Department of Civil and Environmental Engineering at the George Washington University invites applications for a tenure-track faculty position at the level of Assistant Professor starting fall semester 2015. The primary field of interest is mechanics of geomechanical and structural systems. Applications from women and under-represented minority groups are strongly encouraged. 

Basic Qualifications

Zhigang Suo's picture


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

Micromechanical Study of the Interface Properties in Concrete Repair Systems

Hi all,

We've recently published a paper on

Micromechanical Study of the Interface Properties in Concrete Repair Systems

It deals with nanoindentation and numerical simulation of the interface zone in concrete repair systems.


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:  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?

Post Doctoral Position

Open Post Doctoral Position in Biomechanics for 2 years, fully employed, at the Institute of Biomechanics in Graz, Austria.

For more details please see the attachment.

Leon Mishnaevsky's picture

Hybrid and hierarchical nanoreinforced polymer composites

Hybrid and hierarchical polymer composites represent a promising group of materials for engineering applications. In this paper, computational studies of the strength and damage resistance of hybrid and hierarchical composites are reviewed. The reserves of the composite improvement are explored by using computational micromechanical models. It is shown that while glass/carbon fibers hybrid composites

Leon Mishnaevsky's picture

Graphene reinforced polymer composites: 3D micromechanical modelling, damage and fracture

3D computational model of graphene reinforced polymer composites is developed and applied to the analysis of damage and fracture mechanisms in the composites. The graphene/polymer interface properties are determined using the inverse modeling approach. The effect of composite structure, in particular, of the aspect ratio, shape, clustering, orientation and volume fraction of graphene platelets on the
mechanical behavior and damage mechanisms of nanocomposites are studied in computational experiments.

Sutured tendon repair; a multi-scale finite element model.

We've recently published an open access journal paper that looks at the mechanics of sutures used to repair severed tendons. A homogenization strategy is used to derive effective elastic properties for tendon fibrils and intracellular matrix. We have found that regions of high stress correlate with the regions of cell death (necrosis) that are sometimes observed in patients.

If this is of interest, please feel free to view the paper here.



How can I get in Abaqus (XFEM) the Griffith' energy release rate G per time increment?

I want to visualize my results of the XFEM crack growth in form of a diagram with the time increments or the crack length on the horizontal axis and the Griffith' energy release rate G or the stress intensity factor K on the vertical axis. I am using the energy-based damage model.

I don't know, where to activate those values in the Output History. The best solution for me is, if the energy release rate G can be transformed into the stress intensity factor.

Can somebody assist me with modelling the crack propagation with XFEM (Abaqus) in connection with contact problems?


I want to arrange a crack propagation in a screw thread. Therefor I use two dimensional axissymmetric elements in Abaqus 6.12-3 (it is the first version, that allows XFEM in axissymmetric models). The boundaries of the screw thread are on the one hand the symmetry axis, on the other hand the contact to a nut thread that is hold in vertical direction. Thus, there are two nonlinear problems: 1.) the contact problem and 2.) the XFEM crack growth.

1.) Arranging the analysis of the contact problem without crack growth works thoroughly.

Faculty Position - UCSB Mechanical Engineering - Assistant Professor - Tenure Track







The Department of Mechanical Engineering at the University of California, Santa Barbara invites applications for a tenure track faculty position at the level of Assistant Professor with a start date of July 1, 2015 or later. 

ABAQUS subroutine for compressible neo-Hookean material

Hi everyone, 


I am new to ABAQUS software and recently i was trying to implement compressible neo-Hookean material in ABAQUS and for me it is a very difficult task. There are already codes available for the nearly incompressible neo-Hookean material. Since ABAQUS is a widely used software,  i was wondering whether there are any database avaible consisting different codes that we can access. I am desperately looking for a subroutine for compressible neo-Hookean material. Can someone please help me or give me some direction. Thanks a lot !


Best,Deegayu's picture

PhD and PDF positions at Oregon State University

We have a number of open positions in our research group that are available immediately. Summary of the positions are provided below; however, for more information about our research group, please visit

Export Mass Matrices in Abaqus



I have to export stiffness and mass matrices from Abaqus (dynamical simulation)

and I have been using the commands *Matrix Generate and *Matrix Output


I need to export the matrices for different  time points (time intervals) and I have noticed that the entries

of the MASS matrices are not equal at different  time points.


Is that correct or should the MASS matrices be constant for a dynamical simulation?


many thanks

Support program for attendees of 7th South China Sea Tsunami Workshop

The 7th South China Sea Tsunami Workshop (SCSTW-7) will be held on November 17-22, 2014 at National Museum of Natural Science, Taichung, Taiwan, China. As one of the SCSTW-7′s sponsors, Beijing International Center for Theoretical and Applied Mechanics (BICTAM) is pleasured to announce a partial financial support program for proved students and young scientists from Asia-P

Hamid Torabi's picture

Micromechanics of collective buckling in CNT turfs

Complex structures consisting of intertwined, nominally vertical carbon nanotubes (CNTs) are called turfs. Under uniform compression experiments, CNT turfs exhibit irreversible collective buckling of a layer preceded by reorientation of CNT segments. Experimentally observed independence of the buckling stress and the buckling wavelength on the turf width suggests the existence of an intrinsic material length.

Hamed Hatami's picture

PhD Positions in computational mechanics at Oklahoma State University

PhD Positions in the area of computational mechanics are immediately available in the School of Mechanical and Aerospace Engineering at Oklahoma State University. 


The candidates must have already earned or should soon earn their M.Sc. degree in Mechanical Engineering or in a closely related field.

Strong background in numerical simulations, finite element analysis, and/or computational solid mechanics

atefe.geramian's picture

anisotropically in "GEOSTATIC" step (with distortion error)


I simulated an isotropically triaxial test with 550000 (Pa) pressure on top and side of model in "geostatic" step. I defined vertical predefined field stress 550000 and lateral coefficient 1 too. I didnt have probloms in that model and the results were right.

Tricky!!! How to read CPRESS(contact pressure) in a subroutine

I want to set the contact pressure as a input in the routine but I don't know if there is a subroutine allows reading the contact pressure.

Thanks a lot for answering the question!!!


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