FIELD: physics, measurements.
SUBSTANCE: invention is related to methods for detection of residual stresses in axisymmetric tubular products after plastic deformation. Available experimental method is used to identify tangential residual stress in surface layer of tubular product, value of which is used to detect distribution of residual stresses in the whole section of tubular product by the following formulas:
where σr, σθ, σz are accordingly radial, tangential and axial residual stresses; is value of tangential residual stress in surface layer of tubular product; R1 and R2 are accordingly external and internal radiuses of pipe; is nondimensional parametre, which characterises relative thickness of pipe wall; r is radial coordinate; µ is Poisson ratio of pipe material.
EFFECT: improved accuracy and expansion of method potential by determination of all components of residual stress tensor in the whole section of axisymmetric tubular products.
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Authors
Dates
2009-09-10—Published
2008-03-24—Filed