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Andres Lahe's picture

EST method with GNU Octave

The EST method -- -- is a general computational method, for solving boundary value problems for the structural analysis of frames, beams, and trusses. Differential equations are considered here together with a set of boundary conditions.  Compatibility equations for joint displacements and equilibrium equations for member end forces at joints serve as boundary conditions.

Case Study Effect of Pore Size on Pellet-Based Catalyst Flow

We have a new case study on our website based on research at Imperial College into multiscale tomography and calculating permeability for catalysts. The project involved studying the influence of pore structure on fluid flow across large length scales in silica-alumina pellet-based catalysts.

3D data at different length scales was obtained from XMT, DBFIB-SEM and ET scanning and segmented into a binarised dataset.

W. Brocks's picture

elastic follow-up

This is the story of threefold failure, which doubtlessly is the subject of fracture mechanics, a story of failure in various regards, however. First, it comments on an article dealing with failure assessment, second it reports on the personal failure of the blogger to understand this article, and finally it bemoans the failure of a seminal idea.


corotational concept

hello Dear friends

I have one question about corotational concept. is it possible to obtain tangent

stiffness matrix by TL approach and updating degrees of freedom(including displacement and

rotation by corotational. please aware me of related papers.

best regrads



Abaqus Fictitious Surfaces for Beams -- Help


Hello. Looking to create a fictitious surface around an Abaqus model that uses beam elements for the purpose of transferring pressure loads from CFD to the beam. We are restricted to using beam elements; indeed, structure is a very long and thin beam.  

What is the easiest way to do this?

Most grateful for your help.

atefe.geramian's picture

keywords error in vumat

Dear all,

     I constructed a VUMAT subroutine which including 4 state dependent variables, so I wrote "*Initial Conditions, Type=Solution" in keywords. But, when I run the simulation I get this error:

in keyword *PERMEABILITY, file "Job-vumat2.inp", line 102: The keyword is misplaced. It can be suboption for the following keyword(s)/level(s): material


Analysis Input File Processor exited with an error.

    Could anybody help me? Thanks a million.

    I copy my keywords as follows.

Fan Xu's picture

3D finite element modeling for instabilities in thin films on soft substrates

Spatial pattern formation in stiff thin films on compliant substrates is investigated based on a nonlinear 3D finite element model. Typical post-bifurcation patterns include 1D sinusoidal, checkerboard and herringbone shapes, with possible spatial modulations, boundary effects and localizations. The post-buckling behavior often leads to intricate response curves with several secondary bifurcations that were rarely studied and only in the case of periodic cells.

Lallit Anand will receive the 2014 Drucker Medal

Lallit Anand will receive the 2014 Drucker Medal.  There will be a symposium in his honor at the International Mechanical Engineering Congress & Exposition, 14-20 November, Montreal, Canada.  See you there.

WaiChing Sun's picture

AGU Fall Meeting Session: Digital Rock Physics and 3D Printing

Dear Colleagues, 


   I want to invite you to submit abstracts to our session "Digital Rock Physics, 3D Printing and More" in the upcoming AGU Fall Meeting at San Francisco, December 15th to 19th, 2014. The details are listed below. 


Best Regards,




Session ID#: 3129




Co-simulation engine error

I am operating a co-simulation analysis in Abaqus. This a kind of interaction between fluid and solid so I am doing co-execution. Unfortunately, when the program run up suddenly I encounter this error " Error in job Co-execution-3-Model-1: Co-Simulation errorError in job Co-execution-3-Model-2: The partner program in the co-simulation has issued a fatal error message.

how to convert total lagrangian tangent stiffness to corotational

hello Dear friends

I am working on large displacement of euler beam. I used total lagrangian approach. because of field consistency between degrees of freedom(displacement and theta) tangent stiffness matrix depends on tangant theta and consequently becomes singular for theta=90. so I am seeking for a method to overcome this problem. I believe that the solution is to remove rigid body rotation from analysis. please correct me. is this reasonable. if yes how should I remove rigid bodu rotation

best regards.

Ha Bui's picture

A five-year research fellow position at Monash Geomechanics Group, Australia

The position is a research position within the recently launched collaborative research project (“Advanced Condition Assessment and Failure Prediction Technologies for Optimal Management of Critical Water Pipelines” or known as Critical Water Pipe Project). The position is to undertake research components designated in Activity 1 of Critical Water Pipe Project as per Collaborative Research Agreement. Activity 1 covers – How, when and where will pipes fail within the entire network?

Laura De Lorenzis's picture

French-German summer school on "Multiscale modeling of interfaces and avanced solution techniques"

The Graduate School MUSIC offers its second Summer School at the Leibniz Universität Hannover from 8 to 12 September 2014.  This year's summer school on “Multiscale modeling of interfaces and advanced solution techniques" is hosted by the Institute of Continuum Mechanics


Dear all receivers,

Please inform someone me that, if we can obtain Campbell diagram (rotor dynamic) by Abaqus or we just can do that by Ansys or Nastran??

Please let me know,



Reza Mirzaeifar's picture

PhD Position in Multiscale Mechanics of Materials at Virginia Tech

Graduate Research Assistant and Graduate Teaching Assistant positions are available in the Mechanical Engineering department at Virginia Tech.

A Simple Locking-Alleviated 4-Node Mixed-Collocation Finite Element with Over-Integration, for Homogeneous or Functionally-Graded or Thick-Section Laminated Composite Beams

A Simple Locking-Alleviated 4-Node Mixed-Collocation Finite Element with Over-Integration, for Homogeneous or Functionally-Graded or Thick-Section Laminated Composite Beams

by  Dong, L.; El-Gizawy, A.S.; Juhany, K.A.; Atluri, S.N.

This paper can be freely downloaded at:

zichen's picture

PhD positions in solid mechanics/biomechanics at Dartmouth College in 2015

I'm looking for prospective PhD students to study solid mechanics/biomechanics in 2015 at Dartmouth College (Thayer School of Engineering). Visiting or postdoctoral positions are also available for highly qualified candidates from fall 2015. The subjects of research include, but are not limited to, mechanics of morphogenesis in plants/embryos, fast motion of plants (e.g., the Venus flytrap's rapid closure), mechanical self-assembly and instability of thin structures (e.g., DNA, plant tendrils, self-assembly of nanostructures, etc.), and bioinspired structures.

PhD in Mechanical Engineering at United States/United Kingdom/Canada

Im a final year student in Dual Degree(B.Tech in Mechanical Engineering and M.Tech in Intelligent Manufacturing). I want to procure PhD in manufacturing stream. Your suggestions on universities and areas of research are very valuable to me.

How to model fastener with same force-displacement behavior for all translational directions in a plane in Abaqus?

<p>Hi everyone. I want to model the fasteners connecting a wood sheathing to a steel frame in Abaqus. I want to input the same force-displacement behavior for all translational directions in the plane of the sheathing (like a radial spring). <br /> <br /> I was using spring element type Spring2 (nonlinear) but I could define behavior in only 2 translational directions in the sheathing plane (X and Z). This made my model overly stiff after the elastic range. I read about the RADIAL-THRUST connector element but it does not seem to be the one.

Associated flow rule and Non associated flow rule

Can any one please explain me what is meant by associated and non-associated flow rule.

Adjal's picture

Contribution to dynamic behaviour of structures

Most of topics here in this web site treat the physical behaviour of materials, I would like to share my knowledge and my ideas concerned the analysis vibration of materials ( forced and free) for understand the mechanical behaviour of structures

I adress this message to  researcher whom interssting on dynamic of  structures 


Hello everybody

I try brain injury in abaqus 6.13. I use for 3d modelling mimics software and 3 matic. ı make all brain parts from MRI in mimics and export to 3 matic for meshing. I do smoothing,reducing triangle etc. in 3 matic. then export to abaqus with orphanmesh. ı am doing assmbly, step, intreaction, bc,jop etc. in abaqus and run. ı use just abaqus interface but not phton ı am new in abaquse. my problem are


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