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shear

  (shîr) pronunciation
shear
(Click to enlarge)
shear
pruning and pinking shears
(Academy Artworks)

v., sheared, sheared or shorn (shôrn, shōrn), shear·ing, shears.

v.tr.
  1. To remove (fleece or hair) by cutting or clipping.
  2. To remove the hair or fleece from.
  3. To cut with or as if with shears: shearing a hedge.
  4. To divest or deprive as if by cutting: The prisoners were shorn of their dignity.
v.intr.
  1. To use a cutting tool such as shears.
  2. To move or proceed by or as if by cutting: shear through the wheat.
  3. Physics. To become deformed by forces tending to produce a shearing strain.
n.
    1. A pair of scissors. Often used in the plural.
    2. Any of various implements or machines that cut with a scissorlike action. Often used in the plural.
  1. The act, process, or result of shearing.
  2. Something cut off by shearing.
  3. The act, process, or fact of shearing. Used to indicate a sheep's age: a two-shear ram.
  4. also sheers (shîrz) (used with a sing. or pl. verb) An apparatus used to lift heavy weights, consisting of two or more spars joined at the top and spread at the base, the tackle being suspended from the top.
  5. Physics.
    1. An applied force or system of forces that tends to produce a shearing strain. Also called shearing stress, shear stress.
    2. A shearing strain.

[Middle English scheren, from Old English sceran. N., from Middle English shere, from Old English scēar.]

shearer shear'er n.
 
 

A straining action wherein applied forces produce a sliding or skewing type of deformation. A shearing force acts parallel to a plane as distinguished from tensile or compressive forces, which act normal to a plane. Examples of force systems producing shearing action are forces transmitted from one plate to another by a rivet that tend to shear the rivet, forces in a beam that tend to displace adjacent segments by transverse shear, and forces acting on the cross section of a bar that tend to twist it by torsional shear (see illustration). Shear forces are usually accompanied by normal forces produced by tension, thrust, or bending. Shearing stress is the intensity of distributed force expressed as force per unit area. See also Stress and strain.

Shearing actions. (<i>a</i>) Single shear on rivet. (<i>b</i>) Transverse shear in beam. (<i>c</i>) Torsion.
Shearing actions. (a) Single shear on rivet. (b) Transverse shear in beam. (c) Torsion.


 
Thesaurus: shear

verb

    To decrease, as in length or amount, by or as if by severing or excising: chop1, clip1, crop, cut, cut back, cut down, lop1, lower2, pare, prune, slash, trim, truncate. See increase/decrease.

 


1. A deformation (e.g., in a beam or flexural member) in which parallel planes slide relative to each other so as to remain parallel.
2. To cut a metal with a pair of moving blades or with one moving blade and one fixed edge.
3. See shears.


 

An angular deformation of an object without a change in its volume.

 

Person whose occupation is shearing sheep.

 

To prune with long-bladed shears, cutting back all the stems, sometimes severely, to a uniform level or plane.

 
Word Tutor: shear
pronunciation

IN BRIEF: To cut, trim, usually with scissors. Also: To shave off the wool of a lamb.

pronunciation With a fondness for longer hair, the barber didn't like to shear too much.

 
Wikipedia: shear stress

Shear stress is a stress state where the stress is parallel or tangential to a face of the material, as opposed to normal stress when the stress is perpendicular to the face. The variable used to denote shear stress is τ (tau).

The formula for shear stress in a beam is:

\tau = {VQ \over It}
Figure of a bolt in shear. Top figure illustrates single shear, bottom figure illustrates a bolt in double shear.
Enlarge
Figure of a bolt in shear. Top figure illustrates single shear, bottom figure illustrates a bolt in double shear.

Structural members often considered to be in pure shear stress are riveted and bolted joints. For bolts and rivets the two plates must be touching, and locked together for the pure shear case to apply. Welds may also be subjected to pure shear stress depending on the location and loading. Cantilever beams, consoles and column heads are subject to composite loading, consisting of shear, tensile and compressive stress.

Shear stresses within a semi-monocoque structure may be calculated by idealizing the cross-section of the structure into a set of stringers (carrying only axial loads) and webs (carrying only shear flows). Dividing the shear flow by the thickness of a given portion of the semi-monocoque structure yields the shear stress. Thus, the maximum shear stress will occur either in the web of maximum shear flow or minimum thickness.

A road destroyed by shear.
Enlarge
A road destroyed by shear.

Also constructions in soil can fail due to shear; e.g., the weight of an earth-filled dam or dike may cause the subsoil to collapse, like a small landslide.

Shear stress is relevant to the motion of fluids upon surfaces, which result in the generation of shear stress. Particularly, the laminar fluid flow over the surface has a zero velocity and shear stress occurs between the zero-velocity surface and the higher-velocity flow away from the surface.

Shear Stress in Fluids

A viscous fluid (including air and water) moving along a solid boundary will incur a shear stress on that boundary. The no-slip condition dictates that the speed of the fluid at the boundary (relative to the boundary) is 0, but at some height from the boundary the flow speed must equal that of the fluid. The region between these two points is aptly named the boundary layer. The shear stress is imparted onto the boundary as a result of this loss of velocity and can be expressed as

\tau_w = \mu \left.\frac{\partial u}{\partial y}\right|_{y = 0}

where μ is the dynamic viscosity of the fluid, u is the velocity of the fluid along the boundary, and y is the height off the boundary.

Diverging Fringe Shear Stress Sensor

This relationship can be exploited to measure the wall shear stress. If a sensor could directly measure the gradient of the velocity profile at the wall, then multiplying by the dynamic viscosity would yield the shear stress. Such a sensor was demonstrated by A. A. Nawiq and W. C. Reynolds[1]. The interference pattern generated by sending a beam of light through two parallel slits forms a network of linearly diverging fringes that seem to originate from the plane of the two slits (see double-slit experiment). As a particle in a fluid passes through the fringes, a receiver detects the reflection of the fringe pattern. The signal can be processed, and knowing the fringe angle, the height and velocity of the particle can be extrapolated.

Unit of measure

Physical quantities of shear stress are measured in force divided by area (newtons per square meter in SI units). This unit is called the pascal (Pa). Shear stress is also commonly measured in pounds-force per square inch or kilopounds-force per square inch. The area is always the area resisting the shear, and not the area that the force is acting upon. These two areas are always at right angles.

References

  1. ^ Naqwi, A. A. & Reynolds, W. C. (1987), "Dual cylindrical wave laser-Doppler method for measurement of skin friction in fluid flow", NASA STI/Recon Technical Report N 87


See also

External Links

The second page of this brochure explains the concept of the diverging fringe shear stress sensor mentioned above.


 
Translations: Translations for: Shear

Dansk (Danish)
v. tr. - klippe, overskære, afklippe, beskære
v. intr. - undergå forskydning
n. - skæreblad, klippet dyr, klippemaskine, afklippet uld, forskydning

Nederlands (Dutch)
blad (schaar), scheerbeurt, kloof, spleet, scheren, (door) klieven, splijten

Français (French)
v. tr. - tondre
v. intr. - tondre
n. - tonte

Deutsch (German)
n. - Scherung
v. - scheren

Ελληνική (Greek)
n. - κοπή, μηχανικό ψαλίδι, απόκομμα, (πληθ.) κλαδευτήρι
v. - κουρεύω, ψαλιδίζω, κόβω, ξακρίζω

Italiano (Italian)
cesoia, taglio, tranciare

Português (Portuguese)
n. - tosquia (f), corte (m)
v. - tosquiar, cortar, arredondar

Русский (Russian)
ножницы, стрижка, настриг, стричь, резать

Español (Spanish)
v. tr. - esquilar, podar, rapar, privar, despojar, privar de, (mec) romper por esfuerzo cortante
v. intr. - (mec) romperse obedeciendo a un esfuerzo cortante
n. - cizallas, tijeras de jardinero, esquila, (mec) esfuerzo cortante, cortadura

Svenska (Swedish)
n. - avklippt bit
v. - klippa, klippa av, hugga med svärd

中文(简体) (Chinese (Simplified))
修剪, 剥夺, 割, 剪, 剪羊毛, 切断, 切, 大剪刀

中文(繁體) (Chinese (Traditional))
v. tr. - 修剪, 剝奪, 割
v. intr. - 剪, 剪羊毛, 修剪, 切斷
n. - 剪, 修剪, 切, 大剪刀

한국어 (Korean)
v. tr. - 자르다, 보풀을 베어 내다, (권력 따위를) ~에게서 빼앗다
v. intr. - 가위질하다, 돌파하다, (배, 비행기 따위가) 헤치고 나아가다
n. - 큰 가위, (양털) 깎기, 전단 변형

日本語 (Japanese)
v. - 刈る, 毛を刈る, 刈り込む, 切る, から奪う

العربيه (Arabic)
‏(الاسم) مجزة, مقص كبير (فعل) يقص, يجز‏

עברית (Hebrew)
v. tr. - ‮גזז, סיפר, חתך, הוליך שולל, הטעה, מנע מ-, עשה לעירום‬
v. intr. - ‮הולך שולל, הוטעה, נשבר בשל מתח מבני‬
n. - ‮מתח במבנה חומר כששכבותיו מוטות זו ביחס לזו (גיאולוגיה)‬


 
Best of the Web: shear

Some good "shear" pages on the web:


American Sign Language
commtechlab.msu.edu
 

Math
mathworld.wolfram.com
 
 
 

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Dictionary. The American Heritage® Dictionary of the English Language, Fourth Edition Copyright © 2007, 2000 by Houghton Mifflin Company. Updated in 2007. Published by Houghton Mifflin Company. All rights reserved.  Read more
Sci-Tech Encyclopedia. McGraw-Hill Encyclopedia of Science and Technology. Copyright © 2005 by The McGraw-Hill Companies, Inc. All rights reserved.  Read more
Thesaurus. Roget's II: The New Thesaurus, Third Edition by the Editors of the American Heritage® Dictionary Copyright © 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company. All rights reserved.  Read more
Architecture. McGraw-Hill Dictionary of Architecture and Construction. Copyright © 2003 by McGraw-Hill Companies, Inc. All rights reserved.  Read more
Sports Science and Medicine. The Oxford Dictionary of Sports Science & Medicine. Copyright © Michael Kent 1998, 2006, 2007. All rights reserved.  Read more
Veterinary Dictionary. Saunders Comprehensive Veterinary Dictionary 3rd Edition. Copyright © 2007 by D.C. Blood, V.P. Studdert and C.C. Gay, Elsevier. All rights reserved.  Read more
Gardener's Dictionary. Taylor's Dictionary for Gardeners, by Frances Tenenbaum. Copyright © 1997 by Houghton Mifflin Company. Published by Houghton Mifflin Company. All rights reserved.  Read more
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