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Computation of Creep in an Axially Moving Beam
Author(s) -
Simon Gottfried,
Holl Helmut J.
Publication year - 2011
Publication title -
pamm
Language(s) - English
Resource type - Journals
ISSN - 1617-7061
DOI - 10.1002/pamm.201110133
Subject(s) - axial symmetry , creep , deflection (physics) , beam (structure) , mechanics , inertia , computation , transverse plane , rigidity (electromagnetism) , physics , materials science , structural engineering , classical mechanics , mathematics , engineering , composite material , algorithm
Two mechanical models for an axially moving beam supported by discrete elastic springs are derived, analysed and compared. It is considered that the beam has a constant thickness, a predefined temperature distribution and a given transversal load. The first beam model applies global Ritz approximations for the spans with springs. Gauss integration points are used in longitudinal and transverse direction. The second beam model uses a conventional FE description. The thermal and pressure loads cause stresses, which lead to strain rates due to creep of the material so that a time dependent deformation between the elastic supports results. Here the axial motion is considered to be so slow so that inertia effects can be neglected. The axial transport of the inelastic creep‐strains has been considered in the computation. The temperature field is constant and fixed in space. The deflection of the axially moving beam model is computed considering a variable number of spans separated by elastic springs. The computed results of the two mechanical models are compared for a beam with two spans. (© 2011 Wiley‐VCH Verlag GmbH & Co. KGaA, Weinheim)