Investigación

Boundary element analysis for primary and secondary creep problems

E. Pineda Leónª, M.H. Aliabadi^b and M. Ortiz–Dominguez^c

ª Escuela Superior de Ingeniería y Arquitectura, Instituto Politécnico Nacional, U.P. Adolfo López Mateos, Zacatenco, 07738, México D.F., México, e–mail: epinedal@ipn.mx.

^b Department of Aeronautical Engineering, Imperial College London, South Kensington campus, London SW7 2AZ.

^c Instituto Politécnico Nacional. SEPI–ESIME, U.P. Adolfo López Mateos, Zacatenco, 07738, México D.F., México.

Recibido el 11 de abril de 2007
Aceptado el 7 de julio de 2008

Abstract

This paper presents the application of the Boundary Element Method to primary and secondary creep problems in a two–dimensional analysis. The domain, where the creep phenomena takes place, is discretized into quadratic, quadrilateral, continuous internal cells. The creep analysis is basically applied to metals, that are capable of modeling secondary and primary creep behaviour. This is confined to standard power law creep equations. Constant applied loads are used to demonstrate time effects. Numerical results are compared with solutions obtained from the Finite Element Method (FEM) and references.

Keywords: Creep; boundary element method; finite element method

Resumen

Este artículo presenta la aplicación del Método de Elementos de Frontera a problemas del creep primarios y secundarios para un análisis en dos dimensiones. El dominio, donde el fenómeno del creep se genera, es dicretizado con celdas internas cuadriláteras cuadráticas continuas. El análisis del creep es básicamente aplicado a metales, que son capaces de modelar el comportamiento primario y secundario del creep. Dicho comportamiento está limitado a ecuaciones de la ley de potencia del creep. Se aplican cargas constantes para demostrar los efectos del tiempo. Los resultados numéricos son comparados con soluciones obtenidas del Método de Elementos Finitos y referencias.

Descriptores: Creep; elementos de frontera; elementos finitos.

PACS: 62.20.Hg; 43.20.Rz; 47.1 l.Fg

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Acknowledgements

The authors wish to thank Dr. Alejandro Rodriguez Castellanos for his valuable cooperation in this paper.

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