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Encyclopedia > 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). Stress is the internal distribution of force per unit area that balances and reacts to external loads applied to a body. ... Stress is the internal distribution of force per unit area that balances and reacts to external loads applied to a body. ... Look up parallel in Wiktionary, the free dictionary. ... In mathematics, the word tangent has two distinct, but etymologically related meanings: one in geometry, and one in trigonometry. ... Tensile stress (or tension) is the stress state leading to expansion (volume and/or length of a material tends to increase). ... Fig. ... Look up Î¤, Ï„ in Wiktionary, the free dictionary. ...

The formula for shear stress in a beam is:

$tau = {VQ over It}$

With V being the shear force at that location, Q being the first moment of area, t being the thickness in the material perpendicular to the shear and I being the second moment of area of the cross section. The first moment of area, also known as the first moment of inertia, is usually denoted by the symbol Q and is a property of a shape that is used to predict its resistance to shear stress. ... The second moment of area, also known as the area moment of inertia and less precisely as the moment of inertia, is a property of a shape that is used to predict its resistance to bending and deflection. ...

Structural members in pure shear stress are the torsion bars and the driveshafts in automobiles. Riveted and bolted joints may also be mainly subjected to shear stress. Cantilevers, beams, consoles and column heads are subject to composite loading, consisting of shear, tensile and compressive stress. A torsion spring is a ribbon, bar, or coil that reacts against twisting motion. ... Cardan driveshaft with universal joints A driveshaft or driving shaft or Cardan shaft is a mechanical device for transferring power from the engine or motor to the point where useful work is applied. ... Karl Benzs Velo (vÃ©lo means bicycle in French) model (1894) - entered into the first automobile race 2005 MINI Cooper S. An automobile (also motor car or simply car) is a wheeled passenger vehicle that carries its own motor. ... A rivetted buffer beam on a steam locomotive A rivet is a mechanical fastener consisting of a smooth cylindrical shaft with heads on either end, the second one formed in position. ... There are three kinds of fastener given the name bolt. ... The cantilevered beam (green) projects from its supports (blue), balanced by the structure (red block), which supports the load (red arrow). ... A statically determinate beam, bending under an evenly distributed load. ... Console may be: An organ term for the area of an organ including the keys, stops, and foot pedals manipulated by the organist. ... Deconstructing a Roman pillar. ...

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. Monocoque (French for single shell) or unibody is a construction technique that uses the external skin of an object to support some or most of the load on the structure. ... Shear flow is:- in a solid body, the gradient of a shear force through the body; in a fluid, it is the flow induced by such a force gradient - see Viscosity for a fuller treatment. ...

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. Download high resolution version (948x622, 131 KB)A section of the A6187, near Castleton, UK, destroyed by geological subsidence. ... Download high resolution version (948x622, 131 KB)A section of the A6187, near Castleton, UK, destroyed by geological subsidence. ... Mountain road with hairpin turns in the French Alps For other uses, see Road (disambiguation). ... In physics and mechanics, shear refers to a deformation that causes parallel surfaces to slide past one another (as opposed to compression and tension, which cause parallel surfaces to move towards or away from one another). ... This article or section does not cite any references or sources. ... A dyke (or dike) is a stone or earthen wall constructed as a defence or as a boundary. ... Landslide of soil and regolith in Pakistan A landslide is a geological phenomenon which includes a wide range of ground movement, such as rock falls, deep failure of slopes and shallow debris flows. ...

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. laminar and turbulent water flow over the hull of a submarine In fluid dynamics, laminar flow is a flow regime characterized by high momentum diffusion, low momentum convection, and pressure and velocity independence from time. ...

Results from FactBites:

 shear: Definition, Synonyms and Much More from Answers.com (939 words) , sheared, sheared or shorn (shôrn, shōrn), shear·ing, shears. 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. 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).
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