Talk:Energy release rate (fracture mechanics)

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Wiki Education Foundation-supported course assignment

This article was the subject of a Wiki Education Foundation-supported course assignment, between 8 April 2019 and 20 May 2019. Further details are available on the course page. Student editor(s): MingjieZ.

Above undated message substituted from Template:Dashboard.wikiedu.org assignment by PrimeBOT (talk) 20:37, 16 January 2022 (UTC)[reply]

Requested move 6 May 2019

The following is a closed discussion of a requested move. Please do not modify it. Subsequent comments should be made in a new section on the talk page. Editors desiring to contest the closing decision should consider a move review after discussing it on the closer's talk page. No further edits should be made to this discussion.

The result of the move request was: Moved to Energy release rate (fracture mechanics) as suggested by several editor — Martin (MSGJ · talk) 12:39, 22 May 2019 (UTC)[reply]

Strain energy release rate → Energy release rate – the energy release rate is defined as a rate of change of the potential energy, not the strain energy, so "strain energy release rate" is both generally incorrect and misleading. If anything, it should be "potential energy release rate", but it is best and more widely accepted to use "energy release rate." Mbuche1 (talk) 15:07, 6 May 2019 (UTC) --Relisting. Dreamy Jazz 🎷 ^{talk to me | my contributions} 20:45, 13 May 2019 (UTC)[reply]

This is a contested technical request (permalink). Anthony Appleyard (talk) 22:00, 6 May 2019 (UTC)[reply]

@Mbuche1: There are many sorts of energy (not only strain), and all of them can be released at one rate or another. Anthony Appleyard (talk) 22:01, 6 May 2019 (UTC)[reply]
Oppose unless we get a more convincing explanation. The current term is more specific, and also more common in sources; is this not the specific topic intended? Dicklyon (talk) 22:14, 6 May 2019 (UTC)[reply]
Support because the current term is too specific in that the energy release rate is only ever the "strain energy release rate" in the specific case of fixed displacements. In the case of fixed displacements, the strain energy may be interchanged with the potential energy in the fundamental definition of the energy release rate. When displacements are not fixed (most cases), not only the strain energy but also the work done by the external loads are both released. If there would be any confusion in using "energy release rate" (although I have not come across another field that uses it), I propose using "Energy release rate (fracture mechanics)". Mrb289
Doesn't that externally applied work end up in strain energy before it's released? Dicklyon (talk) 03:25, 8 May 2019 (UTC)[reply]

@Dicklyon: No it does not, if a force is applied and displacement is not fixed the following happens: as the crack grows, the point where the force is applied changes location, and the work done by the force along this path is lost and not stored in the material, and never was stored in the material. This is why a fuss is made about fixed/nonfixed displacements, and why the energy release rate is generally written in terms of the potential energy and not the strain energy: it is not only energy stored in the material that is dissipated. Mrb289

I support changing to "Energy release rate (fracture mechanics)". one might argue that SERR=-dU/dA and ERR=-d(U-V)/dA. Except point well taken that U is not always strain energy... AresLiam (talk) 19:40, 10 May 2019 (UTC)[reply]
Oppose Original research is typically not acceptable in Wikipedia articles. Unless you can provide a set of articles by different fracture mechanics researchers that indicate a consensus on the use of a more general term, the standard term should be retained. Bbanerje (talk) 04:10, 10 May 2019 (UTC)[reply]

I support changing to "Energy release rate (fracture mechanics)". This is the standard terminology used in textbooks, see for example Kannien ^[1] or Janssen,.^[2] AlanZehnder (talk) 16:09, 17 May 2019 (UTC)[reply]

References

^ "Advanced Fracture Mechanics" by Kanninen and Popelar ISBN 0-19-503532-1
^ "Fracture Mechanics" by Janssen et al. ISBN 0-415-34622-3

The above discussion is preserved as an archive of a requested move. Please do not modify it. Subsequent comments should be made in a new section on this talk page or in a move review. No further edits should be made to this section.

[1] "Advanced Fracture Mechanics" by Kanninen and Popelar ISBN 0-19-503532-1

[2] "Fracture Mechanics" by Janssen et al. ISBN 0-415-34622-3

[1]

[2]