METHOD DETERMINING RESIDUAL STRESSES Russian patent published in 1999 - IPC

FIELD: determination of residual stresses in axially symmetric articles after working, specifically, in bars and wire after plastic deformation. SUBSTANCE: axial residual stress in surface layer of article is found by known experimental method. Its value is used to determine distribution of residual stresses around section of article by means of following mathematical dependencies: , , , where σ_θ, σ_r, σ_z are correspondingly tangential, radial and axial residual stresses; σ*z

is value of axial residual stress in surface layer of article; μ is Poisson's ratio of material of article; is dimensionless radial coordinate. EFFECT: increased accuracy and expanded capabilities of method thanks to determination of all components of residual stresses around entire section of article. 1 cl