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Congrui Jin's picture

Journal Club for April 2017: Multiscale and Multiphysics Simulation of Hydraulic Fracturing of Gas Tight Shale

Multiscale and Multiphysics Simulation of Hydraulic Fracturing of Gas Tight Shale

Congrui Jin1 , Weixin Li2 and Gianluca Cusatis3

1        Department of Mechanical Engineering, State University of New York at Binghamton, Binghamton, NY 13902 Email:

Frank Richter's picture

reflection and transmission coefficients in long elastic bars


Dear iMechanica Community,

I'd like to ask for advice on modelling reflection and transmission coefficients when two bars with different cross-sectional areas contact each other and are exposed to pulse loading.

I have modelled this process in Abaqus/Explicit as a two-dimensional simulation. The investigation was conveniently done as a parametric study, defining the lateral dimension as parameter. Both bars are slim (length 2 m, diameter 2 cm) and elastic.

Pedro Reis's picture

Postdoc positions in the new group of Pedro Reis at EPFL, Lausanne, Switzerland

I have openings for two post-doc positions in my new research group at the Institute of Mechanical Engineering at the Ecole Polytechnique Fédérale de Lausanne (EPFL) in Lausanne, Switzerland, where I will be moving later this year. The target start date is January 1st, 2018.

nicfang's picture

Computational inverse design of non-intuitive illumination patterns to maximize optical force or torque

This paper aims to maximize optical force or torque on arbitrary micro- and nanoscale objects using numerically optimized structured illumination. By developing a numerical framework for computer-automated design of 3d vector-field illumination, we demonstrate a 20-fold enhancement in optical torque per intensity over circularly polarized plane wave on a model plasmonic particle.

Mengdie Hu's picture

Micromachines (ISSN 2072-666X, Impact Factor: 1.295) Open Access Journal - Published by MDPI

Dear All,

Micromachines (ISSN 2072-666X) is an open access journal on the technology and science of micro-scale machines and micromachinery, published monthly online by MDPI.

Mengdie Hu's picture

Fluids (ISSN 2311-5521) Open Access Journal - Published by MDPI

Fluids  (ISSN 2311-5521) is an international, open access journal on all aspects of fluids, especially fluid mechanics. It is published quarterly online by MDPI. Fluids provides an advanced forum for studies on fluid dynamic theory and its applications, and fluid simulation, modeling and experimentation in chemical, physical and biological processes. Our aim is to publish state-of-the-art papers, including original research papers, reviews, case reports, as well as technical notes and meeting reports.

oliver oreilly's picture

The Shoelace Catastrophe

Readers of this site might be interested in the following paper appeared in the Proceedings of the Royal Society and has received considerable attention in the media:

The roles of impact and inertia in the failure of a shoelace knot

The paper discusses a mechanism for the the accidental untying of a shoelace knot that many of us, including me, experience on a daily basis. The failure is sudden and catastropic as can be seen in the following video:

Flavio Stochino's picture

International Journal of Structural Glass and Advanced Materials Research (IJSGAMR)

Dear all,

the International Journal of Structural Glass and Advanced Materials Research (IJSGAMR) is a peer-reviewed, open access journal which covers all aspects of theoretical and practical research of materials science.


Arash_Yavari's picture

Nonlinear Elastic Inclusions in Anisotropic Solids

In this paper we study the stress and deformation fields generated by nonlinear inclusions with finite eigenstrains in anisotropic solids. In particular, we consider finite eigenstrains in transversely isotropic spherical balls and orthotropic cylindrical bars made of both compressible and incompressible solids. We show that the stress field in a spherical inclusion with uniform pure dilatational eigenstrain in a spherical ball made of an incompressible transversely isotropic solid such that the material preferred direction is radial at any point is uniform and hydrostatic.

surendran47's picture


Is it possible to simulate air flow over objects of unconventional geometries (curved solids) using Abaqus?

Teng Li's picture

Call for nomination of Extreme Mechanics Letters Young Investigator Award 2017

The third Extreme Mechanics Letters (EML) Young Investigator Award is provided by Elsevier to honor the best paper by a young scientist which has been published in volumes 9-12 EML from 2016 to 2017.


Yihui Zhang's picture

Printing, folding and assembly methods for forming 3D mesostructures in advanced materials

Emerging materials and methods for fabricating 3D micro- and nanostructures provide powerful capabilities of relevance across diverse areas of technology. This Review highlights the latest results and future trends associated with the most powerful methods in 3D printing, folding and assembly. 

April Cover of Nature Reviews Materials in 2017

Emilio Martínez Pañeda's picture

Gradient plasticity crack tip characterization by means of the extended finite element method (MATLAB code included)

I hope some of you may find this work interesting, the X-FEM non-linear code developed (incorporating linear elasticity, J2 plasticity, and Strain Gradient Plasticity) can be downloaded from

Gradient plasticity crack tip characterization by means of the extended finite element method

Emilio Martínez-Pañeda, Sundararajan Natarajan, Stéphane Bordas

Computational Mechanics (2017)

Jie. Yin's picture

Programmable Kiri-Kirigami Metamaterials

Y. Tang, G. Lin, S. Yang, Y.K. Yi, R. D. Kamien, J. Yin, “Programmable Kiri-Kirigami Metamaterials”, Adv. Mater. 29, 1604262 (2017)

bilelsandel's picture

looking for phd position in computational mechanics


am looking for a phd position in compututional mechanics i have a good backgroun in numercial simulation and mathematical modeling with MS in mechanical engineering i was working in many topic from material modeling (dammage ,metal forming ...) composite modeling and simulation (continue element of composite shell in high frequency,hommoginazation method crush simulation ,... ) i have a experience in biomechanic modeling and simulation 

i have a good programming skills : fortran c++,python 

finite element ,boundary element,xfem

Davide Bigoni's picture

Elastica compass, catapult and soft robot arm

When an elastic rod with a rotating clamp behaves as a deformable compass or as a deformable catapult?

This behaviour depends on the load applied at the free end!!

Enjoy the elastica compass and the elastica catapult at

Mike Ciavarella's picture

Susmel-Papuga sharp controversy about multiaxial fatigue criteria

I recently came across this sharp controversy between Papuga and Susmel on multiaxial fatigue criteria.  Papuga accuses Susmel of "picking up" data that he likes from the literature, disregarding other data... And of having some constants in the criteria that are set a posteriori as fitting parameters.   Do you know how this ended up?  Anyone else partecipated to the debate? 

 Comments on “A survey on evaluating the fatigue limit under multiaxial loading” by Jan...

Flavio Stochino's picture

A simplified model for railway catenary wire dynamics

In this paper, a simplified analytic model for the dynamic behaviour of railway catenary wire is presented. The model is discussed and validated with the help of numerical results obtained by a finite element code, for the case of a typical Italian railway installation. The simplified model is convenient from the computational point of view and is useful for sensitivity analysis. Some parametric studies have been developed by considering as free parameters the velocity and the distance of the train pantographs and looking at their effect on catenary dynamics.


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