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Explicit vs. implicit FDM: Could you please suggest a reference?

The context is the finite difference modeling (FDM) of the transient diffusion equation (the linear one: $\dfrac{\partial T}{\partial t} = \alpha \dfrac{\partial^2 T}{\partial x^2}$).

Two approaches are available for modeling the evolution of $T$ in time: (i) explicit and (ii) implicit (e.g., the Crank-Nicolson method).

It was obvious to me that the explicit approach has a local (or compact) support whereas the implicit approach has a global support.

Sung Hoon Kang's picture

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

We would like to invite you to submit an abstract to the session on 3D Printed Soft Materials at the ASME 2016 IMECE to be held from November 11 to November 17, 2016 in Phoenix, AZ.

Additive manufacturing, also known as 3D printing, offers unique opportunities to explore novel properties and mechanics of soft materials. This session calls papers from research efforts related to soft materials with novel properties realized or created using 3D printing techniques. Specific topics of interest include, but not limited to:

How to extract angle of twist and shear stress due to torque in Workbench

I set up this model of a shaft with to opposing torque simulating a shaft and pulley system. 

The supports and loads are shown here: Ex-3-9-LoadsAndSupports.png

Note that the origin (top left) has the rotation X constrained to eliminate rigid body motion and to set a reference of zero twist at that point. 

I requested every result that I can imagine, see the Outline here: Ex-3-9-Outline2.png

The torque is shown here: Ex-3-9-TorsionalMoment.png

Mac_Mechanics's picture

Plastic Behavior of Geometrically Nonlinear Shell

Hi All,

I would like to ask what would be a good benchmark test for evaluating the performance of plastic behavior of geometrically nonlinear shell?

Thank you in advance for you suggestions/comments.

 

Regards,

Mac

oliver oreilly's picture

Updates to Online Resource on Rotations

The online resource on rotations, http://rotations.berkeley.eduhas been operational now for nearly 3 years.

My Top 10 Free 3D Model Databases

There are plenty of websites or repositories for 3D models. In practice I’ve often found myself searching through a lot of them when looking for a particular model. In my opinion, there isn’t a one stop shop solution. Instead, there are several really good websites that are worth to check out. In this post I’ll present my favorite 10 3D model databases divided into these four categories:

  • CAD models: If you are a mechanical engineer and are looking for models to re-use in your own design, then these repositories are for you.

SavanRGowda's picture

Linking Abaqus 6.14 with Intel Parallel Studio_xe_2016.compiler

Hi Everyone!

 

I need your help very badly. I am trying to link Abaqus 6.14-2 with Intel parallel Studio_xe_2016. I am not able to link it so far even though I followed many posts that are found on internet. Here's what I did:

anand_mtech's picture

Injection_mass.PROF for combustion simulation in ANSYS

Dear All,

Please help me in finding Injection_mass.PROF file for combustion simulation in ANSYS ICE, 

 

Thanking you,

Anand.A

TIRE MODELLING ABAQUS

DOES ANY ONE TRIED TO MODEL THE ABAQUS TIRE MODEL OR HAVE ATTENDE THE TIRE MODELLING WORKSHOP HELD BY ABAQUS .

PLZ REPLY ASAP

Yonggang Huang's picture

A perspective paper on flexoelectricity by Prof. Pradeep Sharma

A perspective paper on flexoelectricity by Professor Pradeep Sharma (University of Houston) is published in the March (2016) issue of the Journal of Applied Mechanics.  A perspective paper describes an important, emerging field in mechanics.  The first perspective paper, by Professor Huajian Gao (Brown University), has been downloaded more than 8000 times since its publication.  This new paper by Professor Sharma is the 3rd perspective paper published in JAM.  The paper is attached.

Hidroxid's picture

Huang's Crystal Plasticity UMAT taking into account Bauschinger effect for cyclic loading (kinematic hardening)

Hello,  

In the Crystal Plascticity UMAT model for Abaqus (by prof. Hunag) the Bauschinger effect which is important for cyclic loading, is not considered.  

Is there any edited version of this UMAT considering this effect for cyclic loading (by also considering kinematic hardening)?

 

Kind regards,

Omid 

VUMAT Algorithm for writing Cockcroft Lathom model

Can someone advise me the algorithm for writing VUMAT for C-L model?  I have doubts mainly in following steps.

1. Will Elastic and plastic predictor step be similar as isotropic hardening model given in VUMAT example pdf?

2. How to couple damage prediction steps?

VUMAT Algorithm for writing Cockcroft Lathom model

Can someone advise me the algorithm for writing VUMAT for C-L model? I have doubts mainly in following steps.

1. Will Elastic and plastic predictor step be similar as isotropic hardening model given in VUMAT example pdf?

2. How to couple damage prediction steps?

ANSYS terminology... confusing

Why ANSYS calls the well known "element coordinate system" with their own term, "solution" coordinate system? 

Why ANSYS calls  the well know method of applying a "bias" for mesh refinement with their own term, "inflation"? -- I looked it up. INFLATION: to cause to expand or distend with air or gas.

Why ANSYS calls  the well know method of "partitioning" a solid model with their own term, "slice"? OK, may be "slice" is descriptive, but "inflation"? and "solution cs"?   

 

Emilio Martínez Pañeda's picture

XVIII ICMFM - Deadline for abstract submission extended and journal publication

Dear Colleagues

 

We kindly inform you that the Abstract Submission Deadline of the XVIII International Colloquium on Mechanical Fatigue of Metals (XVIII ICMFM) to be held in Gijón, Spain, has been extended until the 20th of February of 2016. Moreover, the registration is already open.

PhD positions: (1) mechanics of porous media, (2) mechanobiology deadline extended

Announcing extension of the deadline of application for the two positions that I posted here last week. The deadline is now extended by one week to 21st February 2016.

Ramathasan Thevamaran's picture

A few experimental studies on the dynamic behavior of foam-like aligned carbon nanotubes

I'm posting a few experimental studies we have conducted on the dynamic behavior of hierarchical fibrous materials, using vertically aligned carbon nanotubes as a model material. I hope these will be useful to those who are interested in buckle-instabilities, multiscale behavior, and energy absorption mechanisms.

An overview:

Ravi-Chandar's picture

Special Volume of the International Journal of Fracture

As part of the celebration of the 50th Anniversary of the International Journal of Fracture, two special volumes were published in 2015. All articles of the 2nd 50th anniversary issue published in Nov/Dec 2015 are now freely accessible at the journal site until the 7th of April. These articles (and the ones published in the 1st 50th anniversary issue published in Jan/Feb 2015) provide reviews and perspectives on many aspects of fracture. You are welcome to browse thorough these articles and provide feedback on this blog!

Matlab source code for XFEM implementation (2D dynamic crack propagation problem)

Hello everyone,

 

I was looking for a Matlab source code for implementing XFEM to solve a dynamic problem (specifically dynamic crack propagation problem). I found several source codes which only solve static problems (they don't calculate mass matrix and they don't do the time integration). 

 

My research goal is to remove the oscillations from stress intensity factors  for a dynmic crack propagation problem. I will really appreciate any kind of help/suggestions.

 

With respectfully

Bhuiyan, A B M Abdul Ali

Shailendra's picture

Post-doctoral positions at National University of Singapore (NUS) and Singapore University of Technology and Design (SUTD)

Starting April 2016, we will have openings for two post-doctoral fellow positions in experimental and computational mechanics of advanced polymers. These positions will support a new research program between Singapore University of Technology and Design (SUTD) and National University of Singapore (NUS) funded by Agency for Science, Technology and Research (A*STAR). The project focuses on synthesizing, characterizing, modeling, and simulating the thermo-mechanical behavior of polymers with covalent adaptable networks (CANs), e.g. vitrimers.

frankyong0707's picture

PhD Position in Computational Biophysics at SUNY Binghamton

A research assistant position funded by NIH is available for a new PhD student in Mechanical Engineering at the State University of New York (SUNY) at Binghamton. The research is focused on biomolecular modeling of bacterial outer membranes. The goal is to reveal the specific interactions between small signaling molecules and physiologically-relevant asymmetric lipid membranes and the membrane behavior in response to the insertion of molecules.

Teng Li's picture

SES2016: Call for Symposium Proposals

 

Dear colleagues,                                                                                                                                                            

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