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Engineering Material: Corrosion and Degradation of Materials Essay Example

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Engineering Material: Corrosion and Degradation of Materials

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Engineering Material: Corrosion and Degradation of Materials. The atoms at the surface form fever bonds as they do not have many neighboring atoms compared to those in the interior part of the material implying that surface atoms are at a higher energy. The adjacent parts of the material separate as a result of high stresses normal to the surface of the fracture. The fracture normally occurs along crystallographic planes referred to as cleavage planes. Brittle fracture requires less energy compared to ductile fracture.It is the fracture that occurs under repeated applied stresses in a material. The failure occurs at stresses that are below the tensile strength of the material. High rate of strain and increase in temperature results in an increase the tendency of fatigue occurring in a material.

When micro cracks at the surface are subjected to motions of dislocation, fatigue fracture takes place as the micro cracks are the points of stress concentration. The excess stress aids in propagating the crack in each cycle of stress application. This failure mode is rapid in brittle materials as the crack propagates at a high rate through the material. There is little or no deformation in a specimen that has been subjected to fatigue fracture as it normally occurs below the tensile strength of the material.It occurs in three stages: crack initiation, stable crack growth, and rapid fracture. In the crack initiation stage, dislocations accumulate close to stress concentrations and form Persistent Slip Bands (PSB) after many loading cycles. PSB leave tiny steps in the material surface which serve as stress risers that initiate cracks. In stable crack growth, the micro cracks join and start to propagate in the material. In the loading cycles, the cracks will grow until the uncracked part of the material can no longer support the load. This then leads to rapid fracture of the specimen.It is the fracture that occurs due to creeping of the material subjected to constant loading. Creep occurs to metals like copper at high temperatures and it is accelerated by high straining rate and high temperatures in a material. . Engineering Material: Corrosion and Degradation of Materials.

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