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I am trying to run an XFEM analysis which consists of assembly of more than 20 instances. I am getting the error, ABAQUS CANNOT ALLOW MORE THAN 20  ENRICHMENT REGIONS IN ONE MODEL. Is there anything I could do? I need to define XFEM cracks (Special>Cracks>Crack Manager> Create > XFEM Crack )for all the 30 parts assembly.


Please assist.

Davide Bigoni's picture

Elastica arm scale

Can configurational forces be exploited to design a new type of scale?

See the explanation and an example of use at

If you're having trouble playing videos on YouTube, click here to watch it.


stress at a point other than integration points in VUMAT/UMAT

Hi all,

The question is how can the stress at a point other than integration points be evaluated in VUMAT/UMAT. Interpolation may be a general method. However, to me, it seems not so easy to be implemented, for I have no idea of the way to retrieve the necessary information of all integration points (their indexes, positions etc.) belongint to a identical FE. Any help would be appreciated.

Fast publishing journals

I am doing reserach in the field of multi-scale modelling of mechanical behavior of polymers.

I was wondering if nayone could introduce me fast publishing (up to three months submission to publication period) in the following areas:

New shear lock free finite elements with arbitrary higher order derivative

A set of highly efficient and shear lock free finite elements based on Timoshenko  beam and Reissner-Mindlin plate theories has been developed for the analysis of thin and thick structures. These elements have arbitrary higher order derivatives and do not require any spcial integration scheme. All are isoparametric elements.


USNCTAM Perspectives on Mechanics in Medicine

Dear Colleagues. I would like to share with you a perspective article on mechanics in medicine by a commission from US National Committee of Theoretical and AppliedMechanics ( online):

Pradeep Sharma's picture

Electrets in soft materials...

This work---whose abstract appears below, has been accepted for publication in Phy. Rev. E:

Transverse shear stresses in Reissner Mindlin theory

How is it possible to obtain the transverse shear stresses correctly, not constant, by Reissner Mindlin theory?

Equilibrium equation would be the first solution, but, once the second derivatives of bilinear shape functions are zero, no results is appeared.


Thanks in advance for any help!

Virtual Special Issue: 'Outstanding research contributions in the area of nonlinear continuum and computational mechanics'

The 2014 Nathan M. Newmark Medal was awarded to Professor Herbert A. Mang at the annual ASCE Structures Conference, which took place in Boston, April 3–5, 2014. Professor Mang was awarded the Newmark Medal for his outstanding research contributions in the area of nonlinear continuum and computational mechanics that clarified the cause of collapse of important concrete structures and quantified the influence of the initial post buckling behavior of metallic structures.  


Ask for comments on my results from unit cell model of MMCs

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Dear friends,

Could anyone be kind to share some comments on my interesting results? It is my first time to post a topic, hope to communicate more with the members here.

Ultra-Strong Collagen-Mimic Carbon Nanotube Bundles

 In spite of worldwide research, carbon nanotubes (CNTs) still have not fully realized their

 original promise as ideal reinforcements for composite materials due to a number of

 challenging issues such as weak interface, poor dispersion, misalignment and lack of optimized

 design. Here we propose a bio-inspired structure of CNT bundles with controllable

 crosslink density and staggered pattern of organization that mimic the architecture of

 natural collagen fiber. Molecular mechanics (MM) simulations show that, under tensile

Elastic Bounds of Bioinspired Nanocomposites

 Biological materials in nature serve as a valuable source of inspiration for developing

 novel synthetic materials with extraordinary properties or functions. Much effort to date

 has been directed toward fabricating and understanding bio-inspired nanocomposites

 with internal architectures mimicking those of nacre and collagen fibril. Here we establish

 simple and explicit analytical solutions for both upper and lower bounds of the elastic

 properties of biocomposites in terms of various physical and geometrical parameters

MAXPS Damage

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Hi everbody,


I am trying to study about carck propagation in a material. The part is 2D deformable and I am going with XFEM for the analysis. 

Can you please tell me how to calculate the MAXPS damage under Damage for Traction Laws?


Elastic Modulus of the material: 0.031 (Newton per micrometer square)

Load: 0.15 um displacement in the 'x' direction = 1.2245e-3 N in the x direction


I am using Abaqus /CAE 6.10


Any kind of help will be appreciated.



Ultimate Linear Motion Mechanism For Clean Energy



I apply force using one slider to another slider. Best part is one slider move little bit and help second slider to slide 6 times length at 70 % force.

Energy Used to move first slider=force*distance



Energy Get on Other Slider= Force*Distance

=Force applied by first slider*cos(45`)*distance

Amit Pandey's picture

Seminal research work: in-situ mechanical testing under electron microscope

A lot work has been done/published in the area of in-situ mechanical testing using electron microscopy. Please list which, according to what you feel has had a significant impact. Here are two in my opinion:

 Uchic, M. D., Dimiduk, D. M., Florando, J. N., & Nix, W. D. (2004). Sample dimensions influence strength and crystal plasticity. Science, 305(5686), 986-989.

Displacement Controlled test using Boundry Condition Module in ABAQUS

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Salam everyone,

I am working on Modeling of a Brick Wall Panel under reverse cyclic load with a concrete lintel at the top.

i need help regarding displacement controlled test in abaqus. there are a total of 24 cycles . . . first four cycles are force controlled (whose frequency is 1/60Hz) and the rest 20 are displacement control (whose frequency is 1/120Hz) . . . the following is the data file . . .


Looking for a Postdoc position in the filed of vibration aided fault diagnosis

I am going to finnish my Ph.D. of mechanical engineering with a thesis in the field of vibration assisted fault diagnosis in about 3 months. My main field of research is vibration and I have worked extensively on gear systemes vibration modeling and diagnostics. 

Currently I am looking for a postdoc position at which I can continue my researches in the abovesaid fields.

my Email address is


How to plot crack growth with time in Abaqus

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I have modeled a 2D plate with sigle edge crack in Abaqus software. I want to plot crack growth with time. Kindly help.


Thanks & regards


Rajwinder Singh


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.

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


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