Plasticity (physics) | Wikipedia audio article
Channel: wikipedia tts
Date: 2018-12-27

This is an audio version of the Wikipedia Article:
https://en.wikipedia.org/wiki/Plasticity_(physics)


00:03:13 1 Contributing properties
00:03:33 2 Physical mechanisms
00:03:44 2.1 Plasticity in metals
00:04:53 2.1.1 Slip systems
00:05:31 2.1.2 Reversible plasticity
00:05:55 2.1.3 Shear banding
00:06:26 2.2 Plasticity in amorphous materials
00:06:38 2.2.1 Crazing
00:07:38 2.3 Plasticity in martensitic materials
00:08:29 2.4 Plasticity in cellular materials
00:09:30 2.5 Plasticity in soils and sand
00:10:09 2.6 Plasticity in rocks and concrete
00:10:43 3 Mathematical descriptions of plasticity
00:10:55 3.1 Deformation theory
00:12:02 3.2 Flow plasticity theory
00:12:48 4 Yield criteria
00:13:33 4.1 Tresca criterion
00:15:06 4.2 Huber-von Mises criterion
00:18:13 5 See also



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SUMMARY
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In physics and materials science, plasticity describes the deformation of a (solid) material undergoing non-reversible changes of shape in response to applied forces.  For example, a solid piece of metal being bent or pounded into a new shape displays plasticity as permanent changes occur within the material itself. In engineering, the transition from elastic behavior to plastic behavior is called yield.
Plastic deformation is observed in most materials, particularly metals, soils, rocks, concrete, foams, bone and skin.  However, the physical mechanisms that cause plastic deformation can vary widely.  At a crystalline scale, plasticity in metals is usually a consequence of dislocations. Such defects are relatively rare in most crystalline materials, but are numerous in some and part of their crystal structure; in such cases, plastic crystallinity can result. In brittle materials such as rock, concrete and bone, plasticity is caused predominantly by slip at microcracks. In cellular materials such as liquid foams or biological tissues, plasticity is mainly a consequence of bubble or cell rearrangements, notably T1 processes.
For many ductile metals, tensile loading applied to a sample will cause it to behave in an elastic manner.  Each increment of load is accompanied by a proportional increment in extension. When the load is removed, the piece returns to its original size.  However, once the load exceeds a threshold – the yield strength – the extension increases more rapidly than in the elastic region; now when the load is removed, some degree of extension will remain.
Elastic deformation, however, is an approximation and its quality depends on the time frame considered and loading speed. If, as indicated in the graph opposite, the deformation includes elastic deformation, it is also often referred to as "elasto-plastic deformation" or "elastic-plastic deformation".
Perfect plasticity is a property of materials to undergo irreversible deformation without any increase in stresses or loads.  Plastic materials with hardening necessitate increasingly higher stresses to result in further plastic deformation.  Generally, plastic deformation is also dependent on the deformation speed, i.e. higher stresses usually have to be applied to increase the rate of deformation. Such materials are said to deform visco-plastically.