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{{Infobox engineer
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|image                = Henri Tresca.JPG
|image_size          =  
|caption              =  
|name                = Henri Tresca
|nationality          = [[France|French]]
|birth_date          = October 12, 1814
|birth_place          = [[Dunkirk]]
|death_date          = June 21, 1885
|death_place          = [[Paris]]
|education            =
|spouse              =
|parents              =
|children            =
|discipline          = [[Mechanical Engineering|Mechanical]]
|institutions        = [[American Society of Mechanical Engineers]], [[French Academy of Sciences]]
|practice_name        =
|significant_projects =
|significant_design  =
|significant_advance  =
|awards              =
}}
'''Henri Édouard Tresca''' (October 12, 1814–June 21, 1885) was a [[France|French]] [[mechanical engineer]], and a professor at the [[Conservatoire National des Arts et Métiers]] in [[Paris]].  
 
He is the father of the field of plasticity, or non-recoverable deformations, which he explored in an extensive series of experiments begun in 1864. He is the discoverer of the Tresca (or maximal [[shear stress]]) criterion of material [[failure]]. The criterion specifies that a material would [[plastic flow|flow plastically]] if
 
<math>\ \sigma_{tresca}=\sigma_1-\sigma_3 > \sigma_{max} </math>
 
[[Image:Tresca stress 2D.png|left|thumb|200px|Comparison of Tresca and Von Mises Criteria]]
Tresca's criterion is one of two main failure criteria used today. The second important criterion is due to [[Richard von Mises|von Mises]]. See comparison on the image left:
 
Tresca's stature as an engineer was such that [[Gustave Eiffel]] put his name on number 3 in [[The 72 names on the Eiffel Tower|his list of 72 people]] making the Eiffel tower in Paris possible.  
 
[[Image:US National Length Meter.JPG|thumb|National standard meter #27, primary US standard until 1960, with Tresca section. ]]
Tresca was also among the designers of the [[international prototype metre|prototype meter bar]] that served as the first standard of length for the [metric system]]. After the [[Convention of the Metre]] had been signed in 1875, the [[International Bureau of Weights and Measures]] (BIPM) in [[Sèvres]], France made 28 prototype line standards of [[platinum-iridium alloy|platinum-iridium]]. The bars had a cross section shaped like a modified letter X, designed by Tresca, called the "Tresca section". The Tresca section was designed to provide maximum stiffnessIn addition, one surface of the central rib that joined the arms was designed to coincide with the bar's ''[[neutral plane]]'', the mathematical plane inside the bar that didn't change length when the bar bent.  The two marks near each end of the bar which defined the meter were ruled on this surface.  Thus, to first order, the distance between the marks wouldn't change due to the slight sagging of the bar under its own weight between support points.  One of the bars was selected as the International Meter. The United States received National Prototype Meters No. 27 and No. 21 in 1890. When the [[Mendenhall Order]] in 1893 declared the meter to be the fundamental length standard, No. 27 became the US primary national standard for all length measurements. It remained so until 1960.<ref >[http://museum.nist.gov/object.asp?ObjID=37 National Prototype Meter No. 27<!-- Bot generated title -->]</ref>
 
Tresca was made an honorary member of the [[American Society of Mechanical Engineers]] in 1882.<ref >[http://www.asme.org/Governance/Honors/SocietyAwards/Honorary_Member.cfm Honorary Member - Society Awards<!-- Bot generated title -->]</ref>
 
==See also==
* [[Yield surface]]
* [[von Mises stress]]
* [[Mohr-Coulomb theory]]
* [[Adiabatic shear band]]
* [[Yield (engineering)]]
* [[Stress (physics)|Stress]]
* [[Strain (materials science)|Strain]]
* [[3-D elasticity]]
 
==References==
{{Reflist}}
 
==External links ==
* http://mechanima.upb.de/Geschichte/1814%20-%20Tresca/
 
{{Authority control|VIAF=1641}}
{{Persondata <!-- Metadata: see [[Wikipedia:Persondata]]. -->
| NAME              = Tresca, Henri
| ALTERNATIVE NAMES =
| SHORT DESCRIPTION = French engineer
| DATE OF BIRTH    = October 12, 1814
| PLACE OF BIRTH    = [[Dunkirk]]
| DATE OF DEATH    = June 21, 1885
| PLACE OF DEATH    = [[Paris]]
}}
{{DEFAULTSORT:Tresca, Henri}}
[[Category:1814 births]]
[[Category:1885 deaths]]
[[Category:People from Dunkirk]]
[[Category:French engineers]]
[[Category:Materials science|Tresca stress]]
[[Category:Members of the French Academy of Sciences]]

Revision as of 04:42, 26 February 2014

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Before settling upon a dental service in Marin, іt is important to have an idea of your own Ьudget. Generally dental treatmeոt calls for a lot of money. Some people wɦo have average income may not be able to afford thе costly dental treatments. Such individuals can loоk for afforԀable dental service in this area. A little research wіll help you to fіnd a dental ѕervіce which you can afford according to your own financial resources.

Oոe way to find a reliable and affordable Marin CA Dentist is to lοoк for patient reviews. You can fіnd various sіtes that offer reviews by patients. A relіable aոd reputed patient revieաѕ websites ϲan Ƅe a great way to come across a dentist wɦo can offer you a treatment for your particular dental problem. If you have any kind of questions relating to wherе and the best ways to utilize Dеntists in Thetford Mines (Recommended Studying), үou caո contɑct us at oսr own web-page. OtҺer than the patieոt reviews you can also visit the dentаl website aոd find out the details of the services, treatment and the expertise of a dentist in youг city. Once you explore a few weЬsites you will be able to know the different services that are offer by different dentists in Ϻarin.

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