Talk:Creep (deformation)

message: "Therefore, dislocation creep has a strong dependence on the applied stress and no grain size dependence" - does this not disagree with say the Hall-Petch effect?   —Preceding unsigned comment added by 143.167.219.26 (talk) 01:41, 18 December 2009 (UTC)
thread_title: "no grain size dependance"?

message: The article says "The rate of this damage is a function of the material properties and the exposure time, exposure temperature and...". What catches my eye is that the rate of deformation is supposed to be dependent upon exposure time. That sounds strange to me. Obviously, the amount of deformation increases with time, but is the rate affected? If anybody could shed some light on this, that'd be great. Or, if someone with enough education to know agrees with me, just edit it. 85.224.198.251 10:43, 7 April 2007 (UTC)
replies: text: Perhaps the wording could be improved, but creep rate is not constant with time.  as the article explains, the classical picture is that strainrate first decreases with time (primary), then plateaus to a constant minimum (secondary), and then increases with time (tertiary). --Karnesky 16:37, 7 April 2007 (UTC)
thread_title: Rate of deform : function of time??

message: I am confused after reading this article. If creep occurs below the yield point, then the deformation should not be permanet? What am I missing?
Also, what is the difference between creep and flow? Is it that you need to enter a nonlinear regime to achieve creep?
:Good questions. They should get answered by the article, but they aren't at the moment. Creep is plastic flow that occurs below the yield point over a long period of exposure to high stress. It only happens to some materials and usually only happens when they are above half their absolute melting temperature. —BenFrantzDale 04:26, 10 October 2005 (UTC)
replies: text: Creep is thermally activated (occurs at higher temperatures) because it is dictated by processes with thermally dependent rates.  Dislocations and atoms can move faster at higher temperatures. --75.0.148.22 13:59, 4 April 2006 (UTC)
thread_title: Creep and flow

message: The text of the article is correct--creep isn't really a failure mode, but a deformation or damage mode.  Any objections to moving the article? -- Karnesky 00:18, 1 November 2005 (UTC)
thread_title:  Creep (failure mode)->Creep (deformation mode) 

message: I removed the recently-added statement "One of the founders of creep is sir matthew ferns and prof ashley combes who conducted a series of breakthrough creep tests on gas turbine engine blades that revolutionised the gas turbine engine industry".  In addition to being borderline nonsense, a Google search for both "matthew ferns creep" and "ashley combes creep" revealed nothing.  I do not know if there is any validity to this sentence or not, but if so, let's please have somebody with a better grasp of English edit it back in. Egomaniac 20:21, 20 March 2007 (UTC)
thread_title:  Vandalism? 

message: The overview section of the article seems to follow lines very close to the creep and creep fracture chapter (20) by Ashby and Jones. Its not a word-for-word job, but the article's examples and layout is eerily similar. Perhaps some more examples and other texts may be used? Unfortunately I am no expert on this topic User A1 08:40, 24 July 2007 (UTC)
thread_title:  Ashby? 

message: "Generally 30-40% of the melting point for metals and 40-50% of melting point for ceramics is required before creep can occur." I would assume this is in K (or absolute temperature, anyway) - perhaps the sentence should be edited? Muad 09:51, 29 August 2007 (UTC)
replies: text: Sorry, but Muad is right; 30% of the melting Temperature of e.g. Gallium will be two very different temperatures when taken in °C or in K. Either about 10°C or about 100 K. Really saying "30%" of a temperature doesn't make sense unless an absolute scale (such as Kelvin) is used. So the sentence should IMHO be edited. -- 92.229.164.108 (talk) 22:55, 28 October 2009 (UTC)
thread_title:  Temperature 

message: Was wondering if the well-known phenomonon (1)  of clock and watch mainsprings losing some of their torque and becoming 'tired' or 'set' after decades of use was an example of creep?  I'm rewriting the Mainspring article, and I can't find any info on this failure mode.   Thanks --ChetvornoTALK 14:34, 3 December 2007 (UTC)
replies: text: I think that is more likely due to metal fatigue or to repetetive "overloading" of the spring, causing plastic deformation. The deformed spring will be deformed in such a way as to minimize stress, hence reducing torque. Creep really occurs at really elevated temperatures, a couple of hundred degrees (C) for most metals  Veddan (talk) 17:20, 30 March 2008 (UTC)
replies: text: Thanks a lot for the info.  I had actually mentioned creep in the mainspring article; I'll take it out.  I'd appreciate any further info or references anyone has on the cause of 'tired' mainsprings, you can leave a note on my talk page.  --ChetvornoTALK 01:35, 20 April 2008 (UTC)
thread_title:  Are 'tired' clock springs an example of creep? 

message: The introduction of any wikipedia article should be no longer than 10 lines in my opinion. Including examples of creep in the introduction is certainly bad practice: suggest restructuring of the entire article. Its all good stuff, but don't throw it out right at the start
131.111.243.37 (talk) 00:42, 19 May 2010 (UTC)
thread_title:  Introduction- Too detailed! 

message: There is a lot of good material on this page, but it needs sorting out (IMHO) and some gaps filling.  Also, there are many valid questions on this talk page that have not been answered.
I am happy to have a go at this (but it will take a while and I will definitiely make my suggestions in a sandbox first).
Before starting, I would like everyone's views on the scope we should address here.  Creep is important in:
* metals (my main field)
* polymers (I know something about this)
* ceramics and concrete (not my area)
* rocks and ice (not my area)
Should we have an introductory article with four subsidiary ones, or try and cover everything in one?  John M Brear (talk) 21:19, 14 October 2011 (UTC)
thread_title:  Re-organisation of this page needed? and a possible split?? 

message: The definition of creep in the opening sentence is not entirely accurate, in that it does not distinguish creep from  Hookean behavior or other deformation modes.  A better and simpler definition of creep is, time-dependent quantifiable strain at constant stress.  The inverse of creep, time-dependent stress at constant strain, is stress relaxation.  Creep is usually associated with a homologous temperature Th ≥ 0.5, but varies with alloy family.  For titanium alloys, elevated-temperature behavior begins at Th ≈ 0.3, for creep-resistant superalloys, Th ≈ 0.56. Failure by creep can occur at or below room temperature in some solids.  Creep is an important form of  anelastic behavior."Elevated-Temperature Failures," Metals Handbook, Ninth Edition, Volume 11: Failure Analysis and Prevention, ASM International, 1986, p 263-297, . G.E. Dieter, Mechanical Metallurgy, Third Edition, McGraw-Hill Inc., 1986, p 432-470, . His Manliness (talk) 21:23, 8 January 2013 (UTC)
thread_title:  Definition of Creep  

message: Hello fellow Wikipedians,
I have just added archive links to  on Creep (deformation). Please take a moment to review my edit. If necessary, add  after the link to keep me from modifying it. Alternatively, you can add  to keep me off the page altogether. I made the following changes:
*Added archive http://web.archive.org/web/20050910220804/http://www.nist.gov:80/public_affairs/releases/wtc_briefing_april0505.htm to http://www.nist.gov/public_affairs/releases/wtc_briefing_april0505.htm
When you have finished reviewing my changes, please set the checked parameter below to true or failed to let others know (documentation at ).
Cheers.—cyberbot IITalk to my owner:Online 14:49, 28 February 2016 (UTC)
thread_title:  External links modified 

message: I'm particularly interested in the kinds of creep: 4.1 - 4.7. But I enjoyed the article till I got there, then it turned into gibberish.  Each is more of a list/jumble of (presumably) truisms and facts than any whole explanations or definitions. IOW; a "D-".   …also seems needlessly stilted, student-like. I doubt if it can be repaired, I think it needs a rewrite (or deletion) by somebody with a gut feeling for this. 	Cheers!  <BR> --2602:306:CFCE:1EE0:78A4:7E16:C27D:29EB (talk) 03:21, 23 July 2018 (UTC)
thread_title:  Style or Content: Sections 4.1 - 4.7 

message: It is my understanding that ratcheting is an important aspect of creep, and that article links here... but this article doesn't mention ratcheting.  Am I missing something?
Yaris678 (talk) 16:31, 23 January 2020 (UTC)
thread_title:  Ratcheting 

message: What type and at what rate for each? I'm seriously doubting that electronics solder or even plumbers solder will creep at room temp. For if it did, old electronics would be failing constantly and there would be leaking water or gas problems in piping 'everywhere' in old buildings. I think the source (number two which does not mention solder) is over extremely over-estimating creep flow in soft alloys.  — Preceding unsigned comment added by 193.119.100.37 (talk) 13:55, 3 July 2023 (UTC)
thread_title:  Solder