Numerical-experimental analysis for residual stress determination in a welded joint
Update: 2013-07-10
Description
The life of a mechanical component depends on the interaction between mechanical characteristics of the material of which it is made and to the stresses to which it is subjected.
In order to determine the total stress acting in a mechanical component, in addition to the stresses caused by external loads imposed during the use, it is necessary to know the residual stress field resulting from manufacturing process and often associated with non-uniform plastic deformation.
Typically, the residual stresses are not uniform throughout the deformed metallic material: these are detrimental because, very commonly, they reduce the elastic limit of the material and cause the tendency of the component to deform during subsequent processing.
The particularly insidious aspect of residual stress is that its presence generally goes unrecognized until after malfunction or failure occurs.
However, even if tensile residual stress fields reduce the mechanical performance of the material by causing the onset of brittle fracture and wear phenomena, the compressive residual stresses generally have a beneficial effect and cause a delay of the onset and the subsequent propagation of the fatigue crack.
In order to determine the total stress acting in a mechanical component, in addition to the stresses caused by external loads imposed during the use, it is necessary to know the residual stress field resulting from manufacturing process and often associated with non-uniform plastic deformation.
Typically, the residual stresses are not uniform throughout the deformed metallic material: these are detrimental because, very commonly, they reduce the elastic limit of the material and cause the tendency of the component to deform during subsequent processing.
The particularly insidious aspect of residual stress is that its presence generally goes unrecognized until after malfunction or failure occurs.
However, even if tensile residual stress fields reduce the mechanical performance of the material by causing the onset of brittle fracture and wear phenomena, the compressive residual stresses generally have a beneficial effect and cause a delay of the onset and the subsequent propagation of the fatigue crack.
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