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critical stress for delamination in multilayers

could someone tell me some equation to get the critical stress for delamination in multilayers?



Question on Fatigue crack growth C and m Paris Law

Are m and C in the paris law equation dependant on the material property or geometry?

For example if using the same material with different thickness, do the C and m values change? For clarity assume centre notched plates, with different plate thicknesses but same material (steel or aluminium).


I appreciate your time.



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

weibang's picture

Thomson Reuters has released a new list of highly cited researchers!

Thomson Reuters has released a new list of highly cited researchers for 2002-2012. You can find more at 

The following solid mechanicians have been selected in the category of engineering, materials science, or computer science.


Satya Atluri (UC Irvine);

Yuri Bazilevs (UCSD);

Ted Belytschko (Northwestern University);

Yonggang Huang (Northwestern University);

Tom Hughes (University of Texas at Austin);

John Hutchinson (Harvard University);

Wenbin Yu's picture

Run GEBT online within a web browser

One can now run GEBT (Geometrically Exact Beam Theory), a general-purpose nonlinear composite beam solver, online within a web browser through Users do not have to install the code on their own machine. And users can access to immediate support if run into any questions. You are welcome to try out the code and let me know any of your questions. 

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



We get 3 times energy on second slider than we use to move first slider.

Postdoctoral position - nonlinear dynamics

Indian Institute of Technology Gandhinagar (IITGN) invites applications for a postdoctoral position from motivated individuals interested in modeling and simulation research in Nonlinear Dynamics (supervised by Profs. Pratyush Dayal and Gaurav Srivastava). These applications are sought under Post-Doctoral Fellowships Program of IITGN. The candidate will be required to develop a fully functional suite of computational tools to perform multiphysics modeling and simulation studies on soft materials.

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.

iMechanica has been upgraded

Harvard IT has recently upgraded iMechanica to a new server.  In addition, iMechanica is now powered by a new version of Drupal.  These changes may affect your use of iMechanica.  Please let us know if you find something wrong.  Thank you.

Zhigang Suo's picture

Bioinspiration and biointegration

The nervous system has long been an inspiration for the engineer.  Here is an example in a popular textbook on neuroscience.  When a person steps on a nail, the sensor in his foot sends a signal to his brain, the brain sends a signal to his muscle, and he lifts his foot.  The example illustrates the sensor, actuator and processor in the nervous system.

EPFL - Faculty position in Structures and Materials

Faculty position in Structures and Materials


postdoctoral position - isogeometric analysis

IMATI-CNR and the Mathematics Department of the University of Pavia offer a postdoc position on isogeometric analysis. This research project focuses on the design and implementation of innovative isogeometric methods for solid/fluid mechanics.  In particular the target applications are related to

- nearly-incompressible and fibered materials

- fluids in geological formations

This research project is partially supported by the private sector, and is supervised by Annalisa Buffa and Giancarlo Sangalli.

Vadim Silberschmidt's picture

Lecturer in Mechanics of Materials - Loughborough University, UK

Loughborough University, UK - Wolfson School of Mechanical and Manufacturing Engineering Lecturer in Mechanics of Materials / Full Time Salary: £34,233 to £45,954 Closing date: 17 August 2014 The School is one of the largest and most successful engineering departments in the UK. Applicants should hold a Doctorate or equivalent experience in Engineering, Computational Mechanics or a related discipline.

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.

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.

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

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:


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