Chan's algorithm - Revision history

en>Bernhard F. J. H.: /* Algorithm */ Replace landau by ceil as a constant factor would be too much

2014-10-14T13:28:22Z

Algorithm: Replace landau by ceil as a constant factor would be too much

← Older revision		Revision as of 15:28, 14 October 2014
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	~~[[Image:CobleCreepgraindiagram~~.~~svg\|frame\|A diagram showing how atoms and vacancies move through a grain as~~ the ~~mechanism of Coble creep]]~~		Hello. Let me introduce the writer. Her title is Emilia Shroyer but it's not the most feminine name out there. Hiring has been my profession for some time but I've already utilized for another one. Years in the past we moved to North Dakota. To do aerobics is a thing that I'm completely addicted to.<br><br>Review my webpage :: [http://www.escuelavirtual.registraduria.gov.co/user/view.php?id=140944&course=1 home std test]
	''~~'Coble creep''', a form of [[diffusion creep]], is a mechanism~~ for ~~[[Deformation (engineering)\|deformation]] of [[crystalline]] [[solid]]s~~. ~~Coble creep occurs through the diffusion of atoms~~ in ~~a material along~~ the ~~[[grain boundaries]], which produces a net flow of material and a sliding of the grain boundaries~~.

	~~Coble creep~~ is named after [[Robert L. Coble]], who first reported his theory of how materials [[Creep (deformation)\|creep]] over time in 1962 in the Journal of Applied Physics [http://scitation.aip.org/getabs/servlet/GetabsServlet?prog=normal&id=JAPIAU000034000006001679000001&idtype=cvips&gifs=yes].

	~~The strain rate in~~ a ~~material experiencing Coble creep is given by:~~

	~~:<math> \frac{d\epsilon}{dt}= \frac{\sigma}{d^3} D_{gb} e^{-Q_{Coble}/RT}</math>~~
	~~where~~
	*<math>\sigma</math> is the applied stress
	*<math>d</math> is the average grain boundary diameter
	*<math>D_{gb}</math> is the diffusion coefficient in the grain boundary
	*<math>-Q_{Coble}</math> is the activation energy for Coble creep
	*<math>R</math> is the molar gas constant
	*<math>T</math> is the temperature in kelvins

	~~Note~~ that ~~in Coble creep, the strain rate <math>\frac{d\epsilon}{dt}</math> is proportional~~ to ~~the applied stress~~ <~~math~~>~~\sigma~~<~~/math~~>~~; the same relationship is found for~~ [~~[Nabarro-Herring creep]]~~. ~~However, the two mechanisms differ in their relationship between the strain rate and grain size <math>d</math>~~. ~~In Coble creep, the strain rate is proportional to <math>d^{-3}</math>, whereas the strain rate in Nabarro-Herring creep is proportional to <math>d^{-2}</math>~~. Researchers commonly use these relationships to determine which mechanism is dominant in a material; by varying the grain size and measuring how the strain rate is affected, they can determine the value of <math>n</~~math> in <math>\frac{d\epsilon}{dt}~\alpha ~d^n<~~/~~math> and conclude whether Coble or Nabarro-Herring creep is dominant[1]~~.

	~~==References~~==
	(1~~) Meyers and Chawla (1999): "Mechanical Behavior of Materials," 555-557.~~

	~~[[Category:Materials degradation]~~]

94.216.211.55: Cleanup WP:COI self citations by Special:Contributions/122.216.15.84.

2013-05-29T21:09:02Z

Cleanup WP:COI self citations by Special:Contributions/122.216.15.84.

← Older revision		Revision as of 23:09, 29 May 2013
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	~~Hi there~~. ~~Let me begin by introducing~~ the ~~writer~~, ~~her title~~ is ~~Sophia Boon but she by no means truly liked that title. Office supervising is exactly where her primary earnings comes from but she'~~s ~~currently applied for another 1~~. ~~My husband doesn't like it~~ the ~~way I do but what I truly like doing~~ is ~~caving but I don't have the~~ time ~~recently. Her family lives~~ in ~~Alaska but her spouse wants them to transfer.<br><br>My page; love~~ [http://~~www~~.~~article-galaxy~~.~~com~~/~~profile.php~~?a=~~143251 phone psychic~~] ~~[http~~://~~netwk.hannam.ac.kr~~/xe/~~data_2~~/~~85669 tarot readings] [[http:~~//~~hknews.classicmall.com.hk~~/~~groups~~/~~some~~-~~simple~~-~~tips~~-~~for~~-~~personal-development-progress~~/ ~~http://hknews~~.~~classicmall.com.hk~~/~~groups~~/~~some~~-~~simple~~-~~tips-for-personal-development-progress~~]]		[[Image:CobleCreepgraindiagram.svg\|frame\|A diagram showing how atoms and vacancies move through a grain as the mechanism of Coble creep]]
			'''Coble creep''', a form of [[diffusion creep]], is a mechanism for [[Deformation (engineering)\|deformation]] of [[crystalline]] [[solid]]s. Coble creep occurs through the diffusion of atoms in a material along the [[grain boundaries]], which produces a net flow of material and a sliding of the grain boundaries.

			Coble creep is named after [[Robert L. Coble]], who first reported his theory of how materials [[Creep (deformation)\|creep]] over time in 1962 in the Journal of Applied Physics [http://scitation.aip.org/getabs/servlet/GetabsServlet?prog=normal&id=JAPIAU000034000006001679000001&idtype=cvips&gifs=yes].

			The strain rate in a material experiencing Coble creep is given by:

			:<math> \frac{d\epsilon}{dt}= \frac{\sigma}{d^3} D_{gb} e^{-Q_{Coble}/RT}</math>
			where
			*<math>\sigma</math> is the applied stress
			*<math>d</math> is the average grain boundary diameter
			*<math>D_{gb}</math> is the diffusion coefficient in the grain boundary
			*<math>-Q_{Coble}</math> is the activation energy for Coble creep
			*<math>R</math> is the molar gas constant
			*<math>T</math> is the temperature in kelvins

			Note that in Coble creep, the strain rate <math>\frac{d\epsilon}{dt}</math> is proportional to the applied stress <math>\sigma</math>; the same relationship is found for [[Nabarro-Herring creep]]. However, the two mechanisms differ in their relationship between the strain rate and grain size <math>d</math>. In Coble creep, the strain rate is proportional to <math>d^{-3}</math>, whereas the strain rate in Nabarro-Herring creep is proportional to <math>d^{-2}</math>. Researchers commonly use these relationships to determine which mechanism is dominant in a material; by varying the grain size and measuring how the strain rate is affected, they can determine the value of <math>n</math> in <math>\frac{d\epsilon}{dt}~\alpha ~d^n</math> and conclude whether Coble or Nabarro-Herring creep is dominant[1].

			==References==
			(1) Meyers and Chawla (1999): "Mechanical Behavior of Materials," 555-557.

			[[Category:Materials degradation]]

en>Altenmann: Reverted good faith edits by Aboeing (talk): No need to list all articles from the category. (TW)

2012-06-13T14:55:50Z

Reverted good faith edits by Aboeing (talk): No need to list all articles from the category. (TW)

New page

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