Everything about Shearing Physics totally explained
Shearing in
continuum mechanics refers to the occurrence of a shear
strain, which is a
deformation of a material substance in which parallel internal surfaces slide past one another. It is induced by a
shear stress in the material. Shear strain is distinguished from volumetric strain, the change in a material's volume in response to stress.
Often, the verb
shearing refers more specifically to a mechanical process that causes a
plastic shear strain in a material, rather than causing a merely
elastic one. A plastic shear strain is a continuous (non-fracturing) deformation that's irreversible, such that the material doesn't recover its original shape. It occurs when the material is yielding. The process of shearing a material may induce a volumetric strain along with the shear strain. In
soil mechanics, the volumetric strain associated with shearing is known as
Reynolds' dilation if it increases the volume, or
compaction if it decreases the volume.
The
shear center is an imaginary point on a section, where a shear force can be applied without inducing any torsion. This is a point through which a force transverse to the axis of a beam section can act and not cause any twisting of the beam section. Also, if the section is twisted, it rotates around this imaginary point. For this reason, it's also known as the
center of twist. In general, the shear center isn't the centroid. For cross-sectional areas having one axis of symmetry, the shear center is located on the axis of symmetry. For those having two axes of symmetry, the shear center lies on the centroid of the cross-section. For unsymmetrical cross-sections, it's difficult to obtain.
In some materials such as
metals,
plastics, or
granular materials like
sand or
soils, the shearing motion rapidly
localizes into a narrow band, known as a
shear band. In that case, all the sliding occurs within the band while the blocks of material on either side of the band simply slide past one another without internal deformation. A special case of shear localization occurs in
brittle materials when they
fracture along a narrow band. Then, all subsequent shearing occurs within the fracture.
Plate tectonics, where the plates of the Earth's crust slide along fracture zones, is an example of this.
Shearing in
soil mechanics is measured with a
triaxial shear test or a
direct shear test.
Further Information
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