N., B., S., K., A., B., M., A. (2008). MODELISATION OF THERMOELASTIC LINEAR BEHAVIOUR OF TUNGSTEN FILAMENTS IN TWIN HELICAL SPRING CONFIGURATION. test, 13(13th International Conference on Applied Mechanics and Mechanical Engineering.), 128-143. doi: 10.21608/amme.2008.39397
BENGHANEM N.; KAOUA S.; BECHEUR A.; AZZAZ M.. "MODELISATION OF THERMOELASTIC LINEAR BEHAVIOUR OF TUNGSTEN FILAMENTS IN TWIN HELICAL SPRING CONFIGURATION". test, 13, 13th International Conference on Applied Mechanics and Mechanical Engineering., 2008, 128-143. doi: 10.21608/amme.2008.39397
N., B., S., K., A., B., M., A. (2008). 'MODELISATION OF THERMOELASTIC LINEAR BEHAVIOUR OF TUNGSTEN FILAMENTS IN TWIN HELICAL SPRING CONFIGURATION', test, 13(13th International Conference on Applied Mechanics and Mechanical Engineering.), pp. 128-143. doi: 10.21608/amme.2008.39397
N., B., S., K., A., B., M., A. MODELISATION OF THERMOELASTIC LINEAR BEHAVIOUR OF TUNGSTEN FILAMENTS IN TWIN HELICAL SPRING CONFIGURATION. test, 2008; 13(13th International Conference on Applied Mechanics and Mechanical Engineering.): 128-143. doi: 10.21608/amme.2008.39397

MODELISATION OF THERMOELASTIC LINEAR BEHAVIOUR OF TUNGSTEN FILAMENTS IN TWIN HELICAL SPRING CONFIGURATION

The International Conference on Applied Mechanics and Mechanical Engineering
Article 80, Volume 13, 13th International Conference on Applied Mechanics and Mechanical Engineering., May 2008, Pages 128-143    PDF (2.2 M)
Document Type: Original Article
DOI: 10.21608/amme.2008.39397
Authors
BENGHANEM N.1; KAOUA S.2; BECHEUR A.3; AZZAZ M.4
1Assistant professor, Faculté des sciences de la nature et de la vie. Université de Bejaia 06000 ALGERIA.
2Assistant professor, Faculté de génie Mécanique et de génie des procédés USTHB ALGER16000 ALGERIA.
3Assistant professor, Laboratoire de Technologie des Matériaux et de Génie des Procédés LTMGP. Université de Bejaia 06000 ALGERIA.
4Professor, Faculté de génie Mécanique et de génie des procédés USTHB ALGER16000 ALGERIA.
Abstract
ABSTRACT
By trying to increase the luminosity or the life expectancy of an incandescent lamp, an
idea consists of a series of successive rolling up of the tungsten filament. This gives
geometrical configurations of filaments named simple, twin, or triple helical spring, etc.
In this paper, we will limit only to the case of the twin helical spring filament. Under the
combined effects of the high temperature and the stresses induced by its own weight,
the filament creeps by becoming plastically deformed in a permanent and a
continuously manner, until the rupture. The theoretical study of the behaviour of these
filaments needs the knowledge of internal loads distribution, deformations modes, and
their evolutions. The present work consists on an elastic structural analysis which must
be the first step. Since the objective is also to study the influence of the filament self
weight solicitation, the orientation with respect to gravitational direction should be taken
into account. Numerical results are obtained by finite element method. They showed a
negligible influence of the solicitations due to the variation of the temperature with
respect to those of the self weight, and a relative sensitivity to the position changes. For
the case of a vertical position, an analytical method has also been developed. Because
of some difficulties, the comparison between the numerical and analytical results could
not be carried out directly. However, the analytical approach proved to be qualitatively
useful for the analysis of numerical results.
Keywords
Twin helical spring filament; self weight; Temperature; POSITION; Finite Elements
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