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Civil-Comp Proceedings
ISSN 1759-3433 CCP: 21
ADVANCES IN POST AND PREPROCESSING FOR FINITE ELEMENT TECHNOLOGY Edited by: M. Papadrakakis and B.H.V. Topping
Paper III.1
Built in Field Equations for Recovery Procedures J. Aalto
University of Oulu, Department of Civil Engineering, Oulu, Finland J. Aalto, "Built in Field Equations for Recovery Procedures", in M. Papadrakakis, B.H.V. Topping, (Editors), "Advances in Post and Preprocessing for Finite Element Technology", Civil-Comp Press, Edinburgh, UK, pp 125-135, 1994. doi:10.4203/ccp.21.3.1
Abstract
A novel local representation for the unknown functions
and the corresponding derivative quantities
of interest, which contains "built in" the information
from the field equations, is presented. It can
be used in connection with element (by element) or
patch (by patch) recovery procedures. A patch recovery
technique, which uses this local representat
ion to get improved global, CO-continuous, smoothed
finite element approximations for the derivative
quantities (such as gradient components or
strains) from the results of standard finite element
analysis, is developed. The presented local
representation is considered in more detail in connection
with the so called quasi-harmonic equation
and the plane elasticity problem. Two numerical
examples with experimental convergence study of the
energy norm are finally given.
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