ISSN:
1662-9752
Source:
Scientific.Net: Materials Science & Technology / Trans Tech Publications Archiv 1984-2008
Topics:
Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
Notes:
Residual stress fields can cause creep damage in thermally aged components, even in theabsence of working loads. In order to study this issue, the authors present a numerical study on thedevelopment of triaxial residual stresses in stainless steel specimens. A mechanical model dedicatedto the analysis of heat treatment problems is described. The presented formulations are implementedincrementally with a non-linear constitutive model, adequate to the simulation of a wide range ofthermal processes. The flow rule is a function of the equivalent stress and the deviatoric stresstensor, of the temperature field and of a set of internal state variables. The thermomechanicalcoupled problem is solved with a staggered approach. Spray water quenching was used to generateresidual stress fields in solid cylinders and spheres made from 316H stainless steel. Finite elementsimulations were performed to find out how process conditions and specimen geometry influencethe resulting residual stress distributions. The results show that compressive residual stresses aredeveloped near the surfaces of the cylinders and spheres while tensile residual stresses occur nearthe centre. The level of residual stresses was found to be dependent on the heat transfer coefficient
Type of Medium:
Electronic Resource
URL:
http://www.tib-hannover.de/fulltexts/2011/0528/02/16/transtech_doi~10.4028%252Fwww.scientific.net%252FMSF.553.7.pdf
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