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Bending and 2D Elasticity: Going Back in Time

Submitted by Ajit R. Jadhav on
research
textbooks
solid mechanics
elasticity
bending
couple stresses

The following is a (relatively minor) question which had occurred to me more than two decades ago. By now I have forgotten precisely when it was... It could have been when I was in my TE (third year engineering) at COEP. ... Or, perhaps, it was later on, when I as at IIT Madras (studying stress analysis on my own). ... I don't remember precisely when it occurred to me, only *how* it did---it was when I was poring over the first part of Dieter's book.



METAL CUTTING SIMULATION USING DEFORM 2D

Submitted by vijaysekar on
research
modelling and simulation

Dear All,

I am working on the simulation of the metal cutting process using DEFORM 2D.I need some

guidance on the software usage.How do we vary the feed rate / cutting speed for different

operations.Can you help.I am pursuing my PhD currently.Do you have a working manual of DEFORM 2D for metal cutting.

Wishes ,

 

VIJAY.

 

 

 

Indentation depth for sphere/limited elastic half-space

Submitted by Blaz on
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Indentation depth for sphere/limited elastic half-space

Hello,

 My problem is the following:

In clasical Hertz theory I was able to locate indentation depth for the case of sphere/elastic half space, which I will denote as d0. I am interested if there is a relatively simple solution for obtaining indentation depth (d1) if this half-space is limited, that is a sphere in contact with either of these three cases:

1. Semi-infinite cylinder of diameter W (sphere is in contact with the upper cylinder side)

2. Semi-infinite prism of side W (sphere is in contact with the upper prism side)

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. 

 

How we can calculate stress intensity factor for bimaterial interface

Submitted by kaslantas on
research

Hi friends,

I would like to calculate stress intensity factor for bimaterial interface using finite element method. Do you have any suggestion about it? Actually I know a method. According to this method,

1-obtain crack face displacement using numerical solution

2- use dundur parameter 

 

Is this method is correct/enough?

 

As you know Franc2D code calcuate SIF for mode I and mode I. But I do not know this code can calculate SIF for bimaterial interface? 

Thanks 

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