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Hao Meng's picture

Mechanics of porous material

Hi all,

I am going simulate a plate of porous material (SiC) to evaluate its strengh.

Would someone share some knowledge on the mechanics of the porous materials.

Thanks.

 /Hao

haimw's picture

Postdoc position is available at Columbia University

POSTDOCTORAL RESEARCH SCIENTIST – Mechanics and Fracture of ice sheets

Zhigang Suo's picture

Linear elastic fracture mechanics

These notes were initially written when I taught fracture mechanics in spring 2010.  The title of the notes was then "toughness".  In revising the notes for the class in 2014, I have changed the title of the notes to "Linear elastic fracture mechanics".

You can access all notes for the course on fracture mechanics

G value for design

Hi all,

 I want to know how the G(Gravity) value will taken as 4g or 3g for the design of the structures.

On what basis the value will be selected.

Any calculation or theory about it, plz tell me.

 

Regards

sagar

Wei Hong's picture

SES 2010 Annual Technical Meeting - Call for Symposia

Dear Colleague:

The Society of the Engineering Science is sponsoring the 47th Annual Technical Meeting (SES2010) on October 4-6, 2010 at Iowa State University in Ames, IA. The meeting is held on biannual basis as a standalone meeting to foster and promote the exchange of ideas and information among the various disciplines of engineering and the fields of physics, chemistry, mathematics, bioengineering and related scientific and engineering fields.

finite difference solution of convective boundary layer flow

Hi
i want to solve convection boundary layer flow past a vertical plate problem using Finite difference method, that is, i have to solve momentum (NavierStokes) and energy equations. Most of the boundary layer problem is solved by similarity transform method. That is they convert PDE to ODE then they solve ODE by Runge Kutta Shooting method. I would like to solve the PDE directly.
Momentum Eqn
U_t+U U_x + V U_y = U_yy + Gr T
Energy Eqn

Mechanics

Mechanics is the paradise of
the mathematical sciences
because by
means of it
one comes to the fruits
of mathematics.

        Leonardo da Vinci (1452-1519)

arash_yavari's picture

Structure of Defective Crystals at Finite Temperatures: A Quasi-Harmonic Lattice Dynamics Approach

In this paper we extend the classical method of lattice dynamics to defective crystals with partial symmetries. We start by a nominal defect configuration and first relax it statically. Having the static equilibrium configuration, we use a quasiharmonic lattice dynamics approach to approximate the free energy. Finally, the defect structure at a finite temperature is obtained by minimizing the approximate Helmholtz free energy. For higher temperatures we take the relaxed configuration at a lower temperature as the reference configuration.

Help

Can anybody help me with piezoelectric modeling using abaqus cae? I am pretty new on this, I am looking at tutorials or *.cae files but I cannot find any. can you please reference me where to find them or maybe explain how it works? Thanks

Suneel Kumar's picture

cylinder with circumferential crack

hi...i m doing 2nd year mtech...i m getting an error while solving circumferential crack in cylinder using ANSYS...while calculating stress intensity factor(SIF) it shows the error as "all crack face nodes do not have the same z value in the currently active coordinate system"...please anyone let me know how to deal this error??

regards

sunil kumar 

UEL for 2 or 3D element types

Dear iMechanica users,

I would like to write a UEL for 2 or 3D element types used in large deformation, but, I really have little experience in it. Is there any UEL example apart from the simple 1D example in Abaqus manual and the complicated one written by Eugenio (XFEM)?

Thanks,

Hadi

About interatomic potentials

Hi all,

I am starting to my phd project focusing on developing new interatomic potentials.

Would you please help introduce some of current research trends(such as review paper, existed potentials etc) on this field.

Thanks.

Teng Li's picture

ASME IMECE2010 Symposium on Integrated Structures and Hybrid Materials

The Integrated Structure Technical Committee in the Applied Mechanics Division of ASME invite you to submit an abstract to the Symposium on Mechanics of Integrated Structures and Hybrid Materials in Advanced Technologies at the 2010 ASME International Mechanical Engineering Congress & Exposition (IMECE).

Date: November 12-18, 2010
Venue: Vancouver, British Columbia, Canada.

L2020's picture

Potential energy of a string

Hi,

I have to use Hamilton pricinple to evaluate the diff. equation of motion of a string. As shown in the figure below, the string is hanged from one end and is free at the other. The flexural stiffness of the string is negligible.

I have a problem with the potential energy of the string! required in the Hamilton principle. Since the flexural stiffness of the string is assumed to be negligible, is there any other term for potential energy? 

 

nonlocal elastcity

volinsky's picture

Summer Job for Students in Europe: International US-European Joint Study of X-Ray Optics Thermomechanical Stability and Control

Summer Job for Students in Europe: NSF-sponsored International Research Experience for Students (IRES)
International US-European Joint Study of X-Ray Optics Thermomechanical Stability and Control

 

Bo Liu's picture

Exact solutions for the free in-plane vibrations of rectangular plates

All classical boundary conditions including two distinct types of simple support boundary conditions are formulated by using the Rayleigh quotient variational principle for rectangular plates undergoing inplane free vibrations. The direct separation of variables is employed to obtain the exact solutions for all possible cases. It is shown that the exact solutions of natural frequencies and mode shapes can be obtained when at least two opposite plate edges have either type of the simply-supported conditions, and some of the exact solutions were not available before.

tuhinsinha.25's picture

Determining multiple contact pairs in Abaqus explicit

Hello,

I want to know that is there a novel way of defining several two dimensional contact pairs in Abaqus/Explicit. I know that abaqus has the capability of defining a general contact but it is restricted only to Abaqus standard and 3D Abaqus explicit problems. 

I have a 2D plane strain problem where I have to specify more than 1000 contact pairs in the assembly between similar instances of the same part. Is there a fortran subroutine that could be used to determine so many contact pairs?

 

Thanks,

Tuhin

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