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Multiple postdoctoral associate positions in virtual surgery at RPI

Description & Requirement
The Center for Modeling, Simulation and Imaging in Medicine (CeMSIM) at Rensselaer Polytechnic Institute, Troy, NY, USA invites applications for multiple postdoctoral associate positions to work on projects funded by the NIH on developing virtual surgery technology.  The ideal candidate will develop the next generation surgical simulation technology  based on advanced physics-based computational methods and robotic systems in collaboration with surgeons at Harvard Medical School.

Cylindrical coordinate system

Hi everybody,

I want to enter coordinate of many points in Cylindrical coordinate system in solidworks, But I don't know how should do this work. 

please help me.


chiqun's picture

A non-traditional view on the modeling of nematic disclination dynamics

Chiqun Zhang          Xiaohan Zhang         Amit Acharya          Dmitry Golovaty          Noel Walkington

Nonsingular disclination dynamics in a uniaxial nematic liquid crystal is modeled within a mathematical framework where the kinematics is a direct extension of the classical way of identifying these line defects with singularities of a unit vector field representing the nematic director. It is well known that the universally accepted Oseen-Frank energy is infinite for configurations that contain disclination line defects. We devise a natural augmentation of the Oseen-Frank energy to account for physical situations where, under certain conditions, infinite director gradients have zero associated energy cost, as would be necessary for modeling half-integer strength disclinations within the framework of the director theory. Equilibria and dynamics (in the absence of flow) of line defects are studied within the proposed model. Using appropriate initial/boundary data, the gradient-flow dynamics of this energy leads to non-singular, line defect equilibrium solutions, including those of half-integer strength. However, we demonstrate that the gradient flow dynamics for this energy is not able to adequately describe defect evolution. Motivated by similarity with dislocation dynamics in solids, a novel 2D-model of disclination dynamics in nematics is proposed. The model is based on the extended Oseen-Frank energy and takes into account thermodynamics and the kinematics of conservation of defect topological charge. We validate this model through computations of disclination equilibria, annihilation, repulsion, and splitting. We show that the energy function we devise, suitably interpreted, can serve as well for the modeling of equilibria and dynamics of dislocation line defects in solids making the conclusions of this paper relevant to mechanics of both solids and liquid crystals.

Amit Acharya's picture

A microscopic continuum model for defect dynamics in metallic glasses

Amit Acharya                       Michael Widom

Motivated by results of the topological theory of glasses accounting for geometric frustration,
we develop the simplest possible continuum mechanical model of defect dynamics in metallic
glasses that accounts for topological, energetic, and kinetic ideas. The model is aimed towards
the development of a microscopic understanding of the plasticity of such materials. We discuss
the expected predictive capabilities of the model vis-a-vis some observed physical behaviors of
metallic glasses.

strains from the given Displacements with given X Y values by Radial Basis Function Thin Plate Spline in MATLAB

Dear Researchers 

I have attach a text file with this message in which I have written all my code. I have applied the Radial Basis Function (interpolation) to find approximated displacements.

f = RBF(r)*a

f = given values e-g displacements to be approximate

RBF(r)= Radal Basis function (Thin Plate spline)

a= Radial Basis Function coefficient

X= x distance from the origin (given) (first column of disppoints)

Y= y distance from the origin (given)(second column of disppoints) For example as below

X    Y    f(U)

1    5    4

Stephan Rudykh's picture

[Call for abstracts] 3D Printed Soft Materials, ASME IMECE 2016

Dear Colleagues,

Please be reminded that this year IMECE runs with two abstract submission deadlines. 

SavanRGowda's picture

Abaqus Fortran Subroutine

Hi Everyone,

I have now managed to run the fortran code, but it won't assign the values that I want to assign to the U(1) variable from the TXT file.

In the attached file I have the Fortran file that I am working on, the input file Subroutine1 (save it as .inp file to open in Abaqus) and the pressure file that contains the nodes and the corresponding pressure values which I want to assign through DISP Subroutine. The code below


Cohesive zone parameters - Carbon nanotube Polymer interface

Hi everyone

I have a question regarding cohesive zone models/laws/parameters for the interface between carbon nanotubes and polymers.  There seems to be a handful of literature on obtaining tangential (shear) cohesive zone information for this type of interface.  For example, there are a couple of experimental and molecular dynamics simulations I have found that try to obtain the cohesive zone parameters for shear.  The problem is that they are all for nanotube pullout which means that they only obtain the shear information.

L. Roy Xu's picture

2016 ASME Congress invitation-Dynamic failure of advanced materials

ThumbnailDr. Jun Xu and I organize  one topic on “Dynamic failure of advanced materials (fatigue failure is included also)” for 2016 ASME Congress  on November 11 to 17. We would invite you (also your colleagues  and group members)  to submit a short abstract before ASME’s deadline March 7 (next Monday). More details below. 


Hi friends,

I have a shell model in solidworks, I want to full it's volume But don't know that how do it? edgs of this model are discontinuous curve.

please help me. (picture of this model is put below)


jansen's picture

PhD Candidate Position in Fatigue Damage Modeling of Composite Structures

The Institute of Structural Analysis at Leibniz Universität Hannover invites applications for a

Scientific coworker / PhD Candidate (Salary scale E13 TV-L)

The position is available from now.  The work should lead to a PhD thesis.

ahmed.hussein's picture

Surface roughness evolution during early stages of mechanical cyclic loading

The effect of crystal size and initial dislocation density on surface roughness evolution in FCC single crystals during the early number of cycles of mechanical cyclic loading is investigated using three dimensional discrete dislocation dynamics simulations. Crystals having size less than 2 μm show early development of surface slip localization, while larger ones show a more uniform distribution of surface steps. The surface roughness is found to increase with increasing number of loading cycles with larger crystals showing a high roughening rate compared to smaller crystals.

ASME Conference: Constitutive Modeling of Biological Tissues

Dear Colleagues, 


On behalf of the ASME Mechanics for Biology and Medicine  Technical Committee and Constitutive Equations Technical Committee, I cordially invite you to submit an abstract to the following track:


12-9 Constitutive Modeling of Biological Tissues 


The ASME/IMECE 2016 will be held from November 11 to November 17, 2016 in Phoenix, AZ (


Abstract submission deadline: March 07, 2016


Thank you,

Shadow Huang

(ABAQUS CAE) piezoelectric analysis


I'm doing piezoelectric analysis using abaqus CAE v6.12.

Specifically, what I'm doing now is to make the bimorph piezoelectric harvester model using Abaqus CAE

and to validate my model.

My FE model is made based on the model developed by A Erturk and D J Inman in their paper,

'An experimentally validated bimorph cantilever model for piezoelectric energy harvesting from base excitations'

They presented the analytical solution for voltage output and experimental validation is also presented in this paper.

Simpleware Boston Seminars: Wednesday Mar 16 2016

Introduction and Live Demo

3D Image Visualization, Analysis and Model Generation with Simpleware

Date: Wednesday, March 16, 2016

Time / Venue: 10:30am - 12:00pm: Boston Marriott Cambridge, 50 Broadway, Cambridge, MA 02142 

Time / Venue: 2:00pm - 3:30pm: Regus Newton, Riverside Center, 275 Grove St #2, Newton, MA 02466    

Who should attend

Jie-Hua Zhao's picture

FEM Job Opportunity at Apple

We are looking for a self-motivated individual who is proficient in FEM simulation with multi-year hands-on experience of FEM software ASNSY or ABAQUS. The individual should also be an expert programer of numerical simulation tools, such as Matlab and Python.

Key Qualifications 

Temporary Researcher Positions in Mechanical Engineering - University of California, Santa Barbara

The Department of Mechanical Engineering invites applications for temporary research positions in the Specialist, Project Scientist, and Researcher titles. This is a pooled recruitment, and appointments are subject to availability of funding and departmental needs, and may be part-time or full-time. Screening of applicants will occur as needed, for full consideration apply by March 2, 2016.


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