iMechanica

Prof. Xiaodong Li and I are collaborating in identifying those physical mechanisms that govern the mechanical properties of nanomaterials. Recently, we have a manuscript accepted by the Journal of Applied Physics and would like to share it with you.

This morning I was looking at the book Mechatronic Reliability by Wei Yang.  The forword I wrote for the book brought back memories of days he and I spent in Santa Barbara and Princeton.  The text of the forword follows.

As a complement to the current issue of journal club, I would like to bring your attention to our current work on dielectric elastomers. 

Delivered at the Annual Dinner of the Applied Mechanics Division, in the Back Bay Ballroom, Sheraton Hotel, Boston, in the evening of 4 November 2008, the Election Day of the United States of America 

Internship Announcement  

Title : FEA of Elastomers

Category: Internship in Industry

Employer: Schlumberger Technology Corporation

Location: Sugar Land, TX, USA

Starting Date: 01/01/2009

I am working on pipeline crack detection simualtion using Ansys. since wave propagation is a transient analysis and I have never used Ansys for this kind of simulation. Help me out if you know any source where I can take it as a reference and start my simulation.

Thanks

Do anybody know any things or have any experience about implementation of damage mechanics formulation for concrete in UMAT?

Deadline for Abstract submission: November 3. See www.mrs.org/spring2009.  A symposium entitled "Structure-Property Relationships in Biomineralized and Biomimetic Composites " will be organized at the MRS-spring meeting in San Francisco next year (April 13-17, 2009).

Hi all

 I have done 3D modeling in Pro E. When i am trying to import it in ANSYS its taking alot of time. almost 1 hour has passed and modle is still not imported in ANSYS. I have converted my modle in IGES format.

Is there any way to import the modle easily from Pro E to ANSYS??? 

Deadline for Abstract submission: November 3. See www.mrs.org/spring2009.  A symposium entitled "Architectured Multifunctional Materials" will be organized at the MRS-spring meeting in San Francisco next year (April 13-17, 2009). For details see below and attached file.

This is supposed to be a very classic analytical solution in applied elasticity. Forgive me if this is a repost or some correction has been made before. I had a hard time with it.

Problem statement:  uniform pressure is applied on cirular area (radius=r) on top of a semi-infinite plane. Find the vertical deflection.

We got discrepancy between FEA solution and analytical solution which I found from different textbooks (famous and non-famous): Deflection within the circle is good, however, no good outside the circle.

We found the correct solution is attached.

I am modelling melting by element death.  I have a cold (melting) rectangle with a hot fluid convecting at the exterior.  I am using a do loop so that time increases at each loop.  I define a "melting" temperature, so that elements are killed off when they achieve a specified temperature.  

I  have done modal analysis and when ANSYS asked to input the start and  end frequency i typed 150 as my starting frequency and 2000 as my ending frequency. No of modes to extract 10 and no of modes to expand 10. Due to no of modes ANSYS has only displyed 10 results. When i entered in postproc and results summary only 10 results were displayed and starting frequency was 150.01 to 150. 39. Now if i want to see all the frequencies how is this possible???Should i maximise the no of modes or is their any other option to view the results???

Hi Every body

I am Dhaneshwar Mishra, a PhD student working in the area of fracture mechanics, basically fracture failure of interfaces of bimaterial, composite layers etc. I am regular reader of IMechanica and got lots of insights by reading different postings on it. I am trying to model the interface in ANSYS 10.0 with their Interface element INTER204. While searching this element in Ansys element library, i could not find it. Will some body guide me to model interface of composite layers using the concept of cohesive zone modelling?

Thank you

Phys. Rev. B 78, 155436 (2008)   J.Y. Huang, F. Ding, B.I. Yakobson

Recent events about the financial crisis and generally spread turmoils on Economics and Financial Environments  lead me to these conclusions.

Critical Speed:  informations, a key issue on finance, reached a critical speed. Maybe this is the "first" critical speed of the system. Speed of informations has reached the same order of magnitude of people's judgement (executives and investors more than others) so there's a sort of over-reaction about actual events.

how can we analyse fatigue crack by using ansys and find the optimum hole for arresting cracks.

thanks to all.

 Recently, enlightened by the definition of inverse pole figure in Materials Science, I proposed an inverse-pole-figure (IPF) method for analysis of domain switching in polycrystalline ferroelectrics/ferroelastics.

Dear all,

This is an immediate position for office in Princeton NJ; GC is preferred but not required.  Feel free to forward. Applicant please contact Dr. Jim Lua (jlua@gem-consultant.com) or me (jshi@gem-consultant.com).

 Best,

Jianxu (Jay) Shi

GEM Princeton NJ Opportunity -- Senior Research Engineer