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Identification of surface stress in the exhaust system pipe made by hydroforming technology based on diffractometric measurements
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Department of Production Engineering and Materials Technology Czestochowa University of Technology Armii Krajowej 19 str., 42-200 Czestochowa, Poland
Publication date: 2019-12-31
Eksploatacja i Niezawodność – Maintenance and Reliability 2019;21(4):562-566
In the work identificaton of surface stresses in the exhaust pipe made of Cr-Ni steel shaped with hydroforming technology. Stresses were determined by the non-destructive x-ray method sin2 ψ. A complex state of tensile stresses with values in the range of 69÷240 MPa for circumferential stresses and 26÷290 MPa for longitudinal stresses was found on the surface of the pipe. The distribution of stresses on the circumference and length of the pipe was analyzed on the basis of coefficients of variation and wall thickness. A relationship was found between the value of surface stress and the wall thickness of the pipe. The highest stresses occurred in the areas of the pipe where the thickness of the wall was reduced the most. In the central part of the pipe, where the wall thickness reduction was the smallest, the stresses were also the smallest, but they were characterized by the highest dispersion of value. The distribution of surface stresses determined by diffractometric method was compared with the model of deformation of the pipe generated numerically
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Exhaust system piping made by hydroforming: relations between stresses, microstructure, mechanical properties and surface
Barbara Kucharska, Oskar Moraczyński
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