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Conception, analyse et caracterisati...

Ecole Polytechnique, Montreal (Canada).

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Conception, analyse et caracterisation des proprietes mecaniques de ressorts composites a renfort tresse.

Record Type:	Electronic resources : Monograph/item
Title/Author:	Conception, analyse et caracterisation des proprietes mecaniques de ressorts composites a renfort tresse./
Author:	Zebdi, Oussama.
Description:	155 p.
Notes:	Source: Dissertation Abstracts International, Volume: 69-03, Section: B, page: 1924.
Contained By:	Dissertation Abstracts International69-03B.
Subject:	Engineering, Materials Science. -
Online resource:	http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=NR37137
ISBN:	9780494371374

Conception, analyse et caracterisation des proprietes mecaniques de ressorts composites a renfort tresse.
Zebdi, Oussama.

Conception, analyse et caracterisation des proprietes mecaniques de ressorts composites a renfort tresse. - 155 p.

Source: Dissertation Abstracts International, Volume: 69-03, Section: B, page: 1924.

Thesis (Ph.D.)--Ecole Polytechnique, Montreal (Canada), 2008.

High performance composites reinforced by woven or braided fabrics have several different applications in various fields such as in the aerospace, automobile and marine industry. This research project was carried out at the Ecole Polytechnique de Montreal in collaboration with an industrial sponsor, the company Composites Atlantic Ltd.

ISBN: 9780494371374Subjects--Topical Terms:

1017759
Engineering, Materials Science.

Conception, analyse et caracterisation des proprietes mecaniques de ressorts composites a renfort tresse.
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020 $a 9780494371374
035 $a (UMI)AAINR37137
035 $a AAINR37137
040 $a UMI $c UMI
100 1 $a Zebdi, Oussama. $3 1035650
245 1 0 $a Conception, analyse et caracterisation des proprietes mecaniques de ressorts composites a renfort tresse.
300 $a 155 p.
500 $a Source: Dissertation Abstracts International, Volume: 69-03, Section: B, page: 1924.
502 $a Thesis (Ph.D.)--Ecole Polytechnique, Montreal (Canada), 2008.
520 $a High performance composites reinforced by woven or braided fabrics have several different applications in various fields such as in the aerospace, automobile and marine industry. This research project was carried out at the Ecole Polytechnique de Montreal in collaboration with an industrial sponsor, the company Composites Atlantic Ltd.
520 $a Composite springs often represent an interesting alternative, given the reduction in weight that they allow with equal mechanical performance compared to metallic springs. Their good resistance to fatigue and corrosion bring additional benefits in several industrial applications. Moreover, the use of the composites increases safety by avoiding the risks of brutal rupture because of the low propagation velocity of cracks in this type of material. Lastly, in electrotechnics, another significant advantage comes into play because of the electrical insulation capability of composite springs.
520 $a Few research results can be found on composite springs in the scientific literature. The first part of this thesis studies the problems connected with the design of composite springs. The results are promising, because it was confirmed that composite springs can be devised with the same mechanical performance in term of stiffness as metallic ones. Two solutions were found to replace the metallic springs of the suspension of a four wheel drive: the first spring was in carbon-epoxy, and the second one in glass-epoxy.
520 $a In the second part, software was developed in order to devise a new approach to predict the mechanical properties of woven or braided composites. This work shows how an inverse method based on plate laminate theory allows creating, from experimental results on braided composites, a virtual basic ply that includes the effect of fiber architecture (undulation and braiding angle). Using this model, the properties of the composite can be predicted for any braid angle. The comparison with the experimental results shows a good correlation with numerical predictions.
520 $a In third part, an experimental study on creep was conducted on composite plates manufactured with the same constitutive materials as the composite springs. Creep tests in three point bending were carried out with Q800 DMA machine. The results showed that creep behavior depends primarily on the polymer matrix. However, rigidity is a function of the fiber-matrix mixture. The braiding angle of 35° corresponds to a characteristic threshold for braided composites: beyond this value, rigidity falls in a creep test at a temperature higher than Tg. It represents also a critical angle in bending or in tensile tests. Above 35°, the failure mode of the composite goes from fragile (rupture of fibers) to a mixed mode, in which the polymer matrix comes also into play with fibers. A good stability was observed for the composites with a braiding angle lower than +/- 35° or higher than +/-60°. Long-term tests were also carried out for two braided composites at +/- 45° and +/- 55° in order to check the predictive model of the DMA. The shift factors obtained from the short and long term tests are roughly equal.
520 $a This thesis has set the ground for the future development on industrial applications of composite springs. The design software predicts the mechanical effectiveness of helical composite springs. The software developed to predict the elastic properties of braided composites accelerates the preparation of characterization results for the design stage. This numerical tool could be generalized for other fiber architectures. It represents a practical tool for further investigations. Finally, the study on creep, although preliminary, provides a first evaluation of the life cycle of composite springs. It would be interesting to proceed now to the design of a first industrial application.
590 $a School code: 1105.
650 4 $a Engineering, Materials Science. $3 1017759
650 4 $a Engineering, Mechanical. $3 783786
650 4 $a Textile Technology. $3 1020710
690 $a 0548
690 $a 0794
690 $a 0994
710 2 $a Ecole Polytechnique, Montreal (Canada). $3 1018606
773 0 $t Dissertation Abstracts International $g 69-03B.
790 $a 1105
791 $a Ph.D.
792 $a 2008
793 $a French
856 4 0 $u http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=NR37137