Talk:Stress intensity factor

Can you transfer the image to commons, so every language wiki could use it? abakharev 09:27, 27 August 2005 (UTC)[reply]
Is this image of the different modes of crack loading, from the equivalent Japanese page clearer? --Amgreen (talk) 07:42, 29 September 2010 (UTC)[reply]

Amgreen: Yes, that one is much nicer :) Please insert that one, if it's possible! 193.11.155.128 (talk) 14:07, 12 October 2010 (UTC)[reply]

Crack tip radius goes towards zero.[edit]

The sentence: "This relation breaks down very close to the tip (small $r$ ) because as $r$ goes to 0, the stress $\sigma _{ij}$ goes to $\infty$ ." might be correct in a mathematical sense, but in reality a crack wouldn't be much smaller than the size of an atom, wouldn't it? And then one still has normally "blunt" cracks which are probably ways broader at the tip than one atom. Peterthewall (talk) 11:23, 27 February 2013 (UTC)[reply]

Examples, Uniform uniaxial stress, crack unsymmetrically[edit]

"If the crack is not located centrally along the width, i.e., $d\neq b$ , the stress intensity factor at location A has the form

K_{\rm {I}}=\sigma {\sqrt {\pi a}}\left[1+\sum _{n=2}^{19}C_{n}\left({\frac {a}{b}}\right)^{n}\right]

where the factors $C_{n}$ can be found in tabulated form for various values of $d$ . A similar expression can be found for tip B of the crack."

This is of exactly NO help at all!

It does NOT "have" this form. It can be "approximated" (quite well, I guess) by this form - given that one is in the possession of the 20

C_{n}

s. But as these are not given here + no reference to them, then this formulae is as helpful as saying "...it takes a form that Google knows. Good luck.".

A real analytical solution can be found in Kathiresan 1984, freely available here: http://oai.dtic.mil/oai/oai?verb=getRecord&metadataPrefix=html&identifier=ADA150420

Scroll down to case 26 on p 175 and combine it with case 11 on p 172. This should do. I don't have the 20 minutes at the moment to type in these formulae, unfortunately. Peterthewall (talk) 15:07, 16 April 2013 (UTC)[reply]

Thanks, Bbanerje for including all this! Peterthewall (talk) 13:44, 19 April 2013 (UTC)[reply]

This page is wrong in nomenclature[edit]

The stress intensity factor is non-sensical term. "Factor" implies a scalar multiple to a variable. This is not a unit-less entity.

What this page is describing is the STRESS INTENSITY.

The stress intensity is the stress CONCENTRATION factor PLUS the applied stress. — Preceding unsigned comment added by 71.178.166.126 (talk) 21:24, 22 September 2018 (UTC)[reply]