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 can be found in engineering components as a result of non-uniform plasticstrain introduced through a variety of manufacturing processes such as rolling, casting, hot forging,cold working, shot-peening, laser shock peening, welding, etc. The numerical simulation of theresulting residual stress field requires the use of sophisticated coupled microstructural and thermomechanicalmodels that rely on profound understanding of the constitutive laws and detailedknowledge of material parameters. In practice this level of understanding is not generally available,leading to the use of simplified models that are unable to reproduce or predict reliably the realresidual stress distributions. This leads to the necessity of using increased safety factors and utilisingoverly conservative designs. A rational approach to the description of residual stress states isproposed that relies on the use of eigenstrain distributions as sources of residual stress. The problemof residual stress evaluation can then be replaced by the problem of determining the underlyingeigenstrain distribution. An approach to this problem is proposed based on a simple variationalformulation. Some examples of its application are shown, and the difficulties and challenges thatmay arise are discussed
Type of Medium:
Electronic Resource
URL:
http://www.tib-hannover.de/fulltexts/2011/0528/02/13/transtech_doi~10.4028%252Fwww.scientific.net%252FMSF.524-525.241.pdf
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