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EU Directive ; required thicknesses of pipe elbows ; pipe bending processes ; relative and logarithmic measures of deformation ; required initial thickness of a bent tube
Abstract:
The relations to calculate the maximum value of strains in processes of bending tubes on benders, in stretched layers of tubes, are presented in this work on the basis of the EU-Directive concerning production of pressure equipment. It has been shown that for large deformations that occur during bending of the pipes on knees, logarithmic strain measures (real) and relative strain measures give different values of strain but equal wall thicknesses in the bending zone. ; Logarithmic measures are frequently used in engineering practice and are valid for large and small deformations. Reverse expressions were also derived to calculate the required initial wall thickness of the tube to be bent, in order to obtain the desired wall thickness of the knee after bending.
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Zielona Góra: Uniwersytet Zielonogórski
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IJAME, volume 22, number 4 (2017)