On the use of solid- and shell-type finite elements in creep-damage predictions of thinwalled structures |
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Authors: | H Altenbach V Kushnevsky K Naumenko |
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Institution: | Lehrstuhl für Technische Mechanik, Fachbereich Ingenieurwissenschaften, Martin-Luther-Universit?t Halle-Wittenberg, D-06099 Halle (Saale), Germany Fax: +49 346 462751; E-mail: holm.altenbach@iw.uni-halle.de, DE
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Abstract: | Summary Solid- and shell-type finite elements available for plasticity and creep analysis are applied to the creep-damage prediction
of a thinwalled pipe bend under uniform internal pressure. Conventional creep-damage material model with scalar damage parameter
is used. Based on the comparative numerical study, performed using solid and shell elements, the applicability frame of the
shell concept is discussed. Particularly, if a dependence on the stress state is included in the material model, the cross-section
assumptions of the first-order shear deformation theory should be refined. The possibilities to modify the through-thickness
approximations are demonstrated on the beam equations. The first-order shear-deformation beam theory is discussed in detail.
It is shown that if the damage evolution significantly differs for tensile and compressive stresses, the classical parabolic
transverse shear-stress distribution and the shear-correction coefficient have to be modified within time-step simulations.
Received 30 January 2000; accepted for publication 30 May 2000 |
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Keywords: | Creep-damage analysis pipe bend finite element beam |
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