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DETERMINATION OF MECHANICAL PROPERTIES AT EACH POSITION ON A MEMBER AND THE FIELD OF RESIDUAL OR ELASTIC STRESSES OCCURING THERE
DETERMINATION OF MECHANICAL PROPERTIES AT EACH POSITION ON A MEMBER AND THE FIELD OF RESIDUAL OR ELASTIC STRESSES OCCURING THERE
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机译：成员在每个位置的机械性能的测定及其产生的残余应力或弹性应力场
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1476180 Testing material SKF COMPAGNIE D'APPLICATIONS MECANIQUES and ANVAR AGENCE NATIONALE DE VALORISATION DE LA RECHERCHE 24 June 1974 [26 June 1973 21 Feb 1974] 28003/74 Heading G1S A non-destructive process for determining the elastic limit of residual stresses in the material of an article adjacent its surface at various depths comprises passing an element having a hemispherical, cylindrical or ellipsoidal contacting surface against the article surface and plotting deformation against load. A series of elements having spherical surfaces of different radii may be pressed successively against the surface with progressively increasing force and a curve plotted for each element the maxima of the curves corresponding generally to the elastic limit and the "envelope" of the series giving variations with depth of the characteristic through e.g. a surface layer hardened by treatment. A single e.g. cylindrical element may be engaged with the article in successive orientations differing by 90 degrees in the plane of the surface, Tresca or Von Mises criteria being used to determine residual stresses in the article. Strain gauges attached to the article surface adjacent the test area indicate when the elastic limit of the material is reached.
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