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whirling of shafts

Submitted by Jayesh_Jain on
research

Hello,

I am doing a literature search on this topic. Particularly, I am interested in existing devices and techniques that are used in academia and industry to 1) avoid shaft whirl in rotating machinery under perturbed loads (e.g. rotor systems), 2) to come out of whirling mode if shaft starts whirling, 3) other techniques related to stabilizing shafts in general to reduce the resulting vibrations.

Any help would be greatly appreciated.

 Thanks.

Results of our academic investigation of the I-35W bridge collapse

Submitted by Roberto Ballarini on
research
I-35W bridge collapse

I attach an essay we wrote for a book that will be published by University of Minnesota Press titled "The city, the river, the bridge." The essay is a transcription of part of a public lecture I gave on infrastructure and on the bridge collapse.

After the bridge collapse there were several posts on Imechanica that included speculation about the cause of the collapse, including fatigue crack growth, lack of redundancy, etc.. Our investigation determined the collapse was a result of an undersized gusset plate that reached its plastic limit load. 

Anybody who can send me some Xfem code.

Submitted by lcwlcw on
research

Hello,

    I am a PhD student in Xi'an, China.

    I am studying  some XFEM related papers, to start coding the method, I thought it would be easier if I go through a code for a basic XFEM problem.

   If anybody who have  the code, please send it to me.

  my email:    lcwlxh [at] 163.com (lcwlxh[at]163[dot]com)

    Thank You. 

 

writing data to dat file and plotting values during job execution

Submitted by Andreas Burger on
writing data to files
plotting values during job execution

Hi,

I am in the process of debugging a UMAT.  In my UMAT code I am currently using write statements to output certain variables to the dat file.  I was wondering if there are any other ways to output data during the execution of a job.  Is it possible to print/plot variables, for example using Matlab (maybe even realtime)?

Also, has anyone experience in accessing the fill files (e.g converting them to ASCII and then use Matlab to look at data?).

Thanks,

Andreas

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