User talk:Bbanerje

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Plasticity

I noticed that you are focusing on the area of plasticity, and that you are working on the yield surface article and other yield criterion articles. I have some suggestions for the organization of ideas and articles. In my view, the article of plasticity should explain the concepts of yield criterion and yield surface. This means that the the article on yield surface should be merged into the plasticity article. Once the concepts of yield surface and yield criterion are explained in the Plasticity article, then each yield criterion article, e.g Drucker's yield criterion, von Mises yield criterion, would explain the particular yield surface and include the figure about it. I am going to suggest the merge of this two articles, Plasticity and yield surface, and you can keep improving the articles of plasticity following the framework I am suggesting. Let me know what you think. - Sanpaz (talk) 15:43, 16 May 2008 (UTC)

Now I noticed something else, that I forgot about. The articles of Plasticity (physics) and Yield (engineering) should be merged too. - Sanpaz (talk) 15:46, 16 May 2008 (UTC)

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Can you explain the images [[File:MC DP Yield Surface 3Da.png]] and [[File:MC DP Yield Surface 3Db.png]]?

—DIV (128.250.80.15 (talk) 00:53, 22 January 2009 (UTC))

Bending

Hi, I see you made some changes to this article recently. One of them was changing the definition to state that bending only occurs in slender structural elements. I'm not sure that's entirely true, although I don't have any sources available to me right now. Can you please add a source if you have one. Thanks! Wizard191 (talk) 12:47, 14 April 2009 (UTC)

Indeed, all materials "bend" locally when loaded. However, in the context of structures, the term "bending" refers to bodies about which some simplifying assumptions can be made, one of which is the assumption of slenderness. The article on bending is still inaccurate and needs work. I'll add some more detail when I get the time. Bbanerje (talk) 02:28, 17 April 2009 (UTC)

We might want to make that note in the introduction of the article. Perhaps something along the lines of: "While bending can occur locally in all objects, it is usually only studied in slender objects because other stress modes are more pronounced in non-slender objects." Or something like that. Wizard191 (talk) 12:50, 17 April 2009 (UTC)

Hosford Yield Criterion

It was me that changed the exponent n from 1 to ∞ to make the statement about Tresca correct. I think you shouldn't undo this change, because your initial statement is wrong (try filling in n = 1 in the Hosford yield equation and find that you end up with zero on the left side). Notice that von Mises and Tresca are the bounds of the Hosford yield criterion. The minimal value of n equals 2, which corresponds with von Mises and gives the outer bound. When n is increased, a Hosford yield surface is found that lies inside the von Mises yield surface and ultimatelly, the Hosford yield surface will correspond with the Tresca yield surface. I didn't know better than to change it in this way and thought maybe it would get you to think about your statement. Note that I didn't change the figures because I don't know how to do that.

MWoldman (talk) 07:35, 9 September 2009 (UTC)

When the exponent is 1 the lhs is not zero because the sum of three positive numbers cannot be zero. Notice that the absolute value of the difference of the principal stresses has been used. Bbanerje (talk) 23:11, 9 September 2009 (UTC)

List of inequalities

I've just added Clausius–Duhem inequality to the list of inequalities. If you know of others that should be there but are not, could you add those too? Michael Hardy (talk) 03:48, 19 October 2009 (UTC)

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Figure

Hi! I believe that in this figure the axis x1 and x2 (left under) must be interchanged. Is this correct? Thanks--Kaktus Kid (talk) 17:12, 8 June 2011 (UTC)

Thanks. Corrected. Bbanerje (talk) 02:59, 10 June 2011 (UTC)

Data source for natural rubber Neo-Hookean constants

Hi! Could you please give the source of data for natural rubber Neo-Hookean constants, i.e. where mu and kappa was calculated (for the diagrams at the the Neo-Hookean solid page)? Thanking in anticipation, Ivan — Preceding unsigned comment added by 142.157.44.72 (talk) 16:43, 14 December 2011 (UTC)

These are based on Shore hardness and other material data provided by a manufacturer of natural rubber. They are within the range published by other manufacturers and the open literature. However, given the large variability in properties depending on the amount of vulcanization and the process used, these numbers should only be taken as indicative of magnitudes. Bbanerje (talk) 20:46, 14 December 2011 (UTC)

Could you please give any references where parameters were calculated for rubber as compressible material? All sources I know contain only the mu value. Thanking in anticipation, Ivan — Preceding unsigned comment added by 142.157.44.84 (talk) 14:44, 15 December 2011 (UTC)

A publicly available source is the set of Malaysian rubber data sheets, for example [1] and [2]. Bbanerje (talk) 20:36, 15 December 2011 (UTC)

Thanks a lot! — Preceding unsigned comment added by 142.157.44.135 (talk) 18:42, 16 December 2011 (UTC)

Second Piola-Kirchhof tensor

Hellow again! Could you please give the reference to the book, where the expressions for the second Piola-Kirchhof stress tensor in terms of strain energy density can be found? There are no references at the "Hyperelastic material" page. Thanking in anticipation, Ivan — Preceding unsigned comment added by 142.157.44.134 (talk) 14:55, 12 January 2012 (UTC)

Look at Ogden's book Non-linear elastic deformations Chapter 4 p. 206 for the relationship between the PK-1 and W. and Chapter 3 p.153 (or any book on nonlinear finite element analysis) for the relations between PK-1 and PK-2. Bbanerje (talk) 00:58, 13 January 2012 (UTC)

Thank you! — Preceding unsigned comment added by 142.157.45.113 (talk) 19:57, 16 January 2012 (UTC)

Which software

May I ask wich software did you use to create some of the images that appear in the Bending of plates page, like ? Juanlu001 (talk) 08:04, 16 February 2012 (UTC)

That plot was made with Matlab. Bbanerje (talk) 21:17, 16 February 2012 (UTC)

software???Matlab???

May I ask you which software you use to plot followed figure? Matlab? Could you give me some tipps how can I do it ?Thank you in advance! Piansan (talk) 18:28, 13 April 2013 (UTC) — Preceding unsigned comment added by Piansan (talk • contribs) 18:22, 13 April 2013 (UTC)

J-integral

I was looking at the J-integral page and noticed some slight inaccuracies. First, J does not give the energy release rate in small-scale yielding except under certain special cases. Those cases include monotonic loading in mode III or of pure power-law hardening materials. J is not path-independent for monotonic mode I and mode II loading of elastic-plastic materials, so only a contour very close to the crack tip gives the energy release rate. Also, Rice showed that J is path-independent in plastic materials when there is no non-proportional loading. Unloading is a special case of this, but non-proportional plastic loading also invalidates the path-independence. Such non-proportional loading is the reason for the path-dependence for the in-plane loading modes on elastic-plastic materials. ChadMLandis (talk) 14:17, 21 February 2012 (UTC)

6x6 notation, orthotropic and all that

Hi, please accept my apologies for wasting your time with my ignorant comments about non-isotropic elasticity and the voigt notation. Thanks for the tips. All the best, --Jorge Stolfi (talk) 23:48, 5 February 2013 (UTC)

Edits to mechanics articles

Dear Bbanerje, If I deleted any significant material from the mechanics articles it was purely by accident. I hope that my edits will make all that material *more* accessible to lay and specialist readers alike.
On the other hand, I strongly believe that Wikipedia should not be turned into a collection of college textbooks. (There is a WikiBooks sister project that aims to do just that.) I believe that such a goal is clearly excluded by the "five pillars", and I am really scared at seeing that such a transformation is happening in several areas. By the way it is built, Wikipedia will never be able to replace a good textbook; and there are many good textbooks freely available out there.
Being on-line rather than paper, Wikipedia can (and, I believe, should) host arbitrarily specialized articles; but it should always try to make the information accessible to all the people who are likely to need it, as directly and clearly as possible. So, I believe that information should be partitioned, packaged and linked in such a way that readers who need some chunk of information will find and understand it as quickly as possible, while those who do not need it will not be forced to read it. That is what I try to keep in mind while editing.
As for "original research", I never intended to do that; if I did it was a mistake, out of ignorance or distraction. Could you please point out where I went wrong?
All the best, --Jorge Stolfi (talk) 00:51, 25 February 2013 (UTC)

Re that comment about "true stress", I must have been half asleep when I wrote that because I certainly cannot tell what the average engineer thinks. Please fell free to correct the statement, and please accept my apologies for the trouble caused. --Jorge Stolfi (talk) 22:59, 25 February 2013 (UTC)

Deformation vs displacement

Hi Bbanerje, my complaint about deformation including rigid rotations is not technical, just linguistic. Even if we forget the common sense of the words and consider only engineers' jargon, I do not think that the definition given in the article would be commonly accepted. "Deformation" means "getting out shape", which means changes in the distances between particles. For 3D bodies, I thought that the common nomenclature was "displacement" for the overall motion, "displacement gradient" for its Jacobian, and "(local) deformation" only for the symmetric part of said Jacobian, that is, the strain tensor. Is this not the case?
In the 2D-in-3D example you gave, the sheet definitely gets deformed because the straight-line distances between its particles change (even if their geodesic distances do not). In this situation, I suppose that to describe the local "deformation" one should give, besides the 2D strain tensor, also some curvature (not slope!) information. Isn't this so?
If the sheet merely rotates in space as a rigid body, I do not think that anyone, even mechanical engineers, would say that it has deformed. Or would they?
Are there other books that use that definition?
Perhaps there is some confusion about local vs global? Indeed in a global deformation of a structure there may be parts or points where the material suffers only a rigid body motion. Perhaps the author meant to say just that?
Or maybe he is saying that in stress analysis (not in mechanics in general) the goal is commonly stated as "find the deformation", but what is meant is "find the displacement (not just the deformation)"?
All the best, --Jorge Stolfi (talk) 01:50, 27 February 2013 (UTC)

Measures of stress

Hi Bbanerje, have you seen my questions in the Talk:stress measures? I am confused about the notation. If you could please help me understand... Thanks! --Jorge Stolfi (talk) 02:22, 28 February 2013 (UTC)

Article Feedback deployment

Hey Bbanerje; I'm dropping you this note because you've used the article feedback tool in the last month or so. On Thursday and Friday the tool will be down for a major deployment; it should be up by Saturday, failing anything going wrong, and by Monday if something does :). Thanks, Okeyes (WMF) (talk) 22:17, 13 March 2013 (UTC)

AFT5 re-enabled

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Barnstar

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