Thermomechanical material parameters characterization of the superalloy PN 3601669-7 under low-velocity impacts
Identifieur interne : 000541 ( Main/Exploration ); précédent : 000540; suivant : 000542Thermomechanical material parameters characterization of the superalloy PN 3601669-7 under low-velocity impacts
Auteurs : Abdelkader Nour [Algérie] ; Samir Lecheb [Algérie] ; Nouredine Chikh [Algérie] ; M. Ouali Si-Chaib [Algérie]Source :
- Journal of mechanical science and technology [ 1738-494X ] ; 2011.
Descripteurs français
- Pascal (Inist)
- Choc mécanique, Bruit thermique, Fissure, Long terme, Rupture, Température ambiante, Source chaleur, Charge dynamique, Choc élastique, Matériau réfractaire, Superalliage, Basse vitesse, Aéronef, Contrainte contact, Thermodynamique, Modèle Boussinesq, Convolution, Analyse contrainte, Modélisation, Fonction transfert, Essai matériau, Etude expérimentale, Cobalt, ..
- Wicri :
- topic : Matériau réfractaire, Thermodynamique, Cobalt.
English descriptors
- KwdEn :
- Aircraft, Boussinesq model, Cobalt, Contact stress, Convolution, Crack, Dynamic load, Elastic shock, Experimental study, Heat source, Long term, Low speed, Material testing, Mechanical shock, Modeling, Refractory material, Room temperature, Rupture, Stress analysis, Superalloy, Thermal noise, Thermodynamics, Transfer function.
Abstract
This work concerns the characterization of the thermodynamic behavior of the superalloy Airsist 215 (PN 3601669-7) containing cobalt. Such superalloys are used in aeronautical construction, in the hot parts of the turbine. They are frequently used for the production of the paddles. The parts in service are subjected to dynamic solicitations and thermal fluctuations over the course of time. They are responsible for modification and degradation of material properties. This can lead to the appearance of cracks and, in the long term, to the rupture of these parts. In this paper, a preliminary physical study is made on the appearance of the cracks, followed by experiments using shocks at ambient temperature and under a heating situation which simulates combustion. It is found that these dynamic loads have a significant impact on the development of the cracks that appear on the segments of the turbine nozzle. The study is devoted to the elastic shock of Hertz-Boussinesq extended to viscoelastic bodies by direct convolution of Riemann-Stielges. The interest resides in the local convolution and the distribution of stresses in the contact zone. The shock excitation method includes a deduced force in the load and disload phases. This force is an impulse which approaches a Dirac function. The sample can be modeled approximately by a system of one degree of freedom for natural frequency, damping and transfer function. The spectral response of the specified shock allows calculation of the damping. Every point of this spectrum gives the response for the linear system of the transfer function. Then, viscoelastic shock parameters are deduced.
Affiliations:
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Boumerdes University</s1><s3>DZA</s3><sZ>1 aut.</sZ><sZ>2 aut.</sZ><sZ>3 aut.</sZ><sZ>4 aut.</sZ></inist:fA14><country>Algérie</country><wicri:noRegion>Dynamic Motors and Vibroacouslic Laboratory, F.S.I., M B. Boumerdes University</wicri:noRegion></affiliation></author><author><name sortKey="Lecheb, Samir" sort="Lecheb, Samir" uniqKey="Lecheb S" first="Samir" last="Lecheb">Samir Lecheb</name><affiliation wicri:level="1"><inist:fA14 i1="01"><s1>Dynamic Motors and Vibroacouslic Laboratory, F.S.I., M B. Boumerdes University</s1><s3>DZA</s3><sZ>1 aut.</sZ><sZ>2 aut.</sZ><sZ>3 aut.</sZ><sZ>4 aut.</sZ></inist:fA14><country>Algérie</country><wicri:noRegion>Dynamic Motors and Vibroacouslic Laboratory, F.S.I., M B. Boumerdes University</wicri:noRegion></affiliation></author><author><name sortKey="Chikh, Nouredine" sort="Chikh, Nouredine" uniqKey="Chikh N" first="Nouredine" last="Chikh">Nouredine Chikh</name><affiliation wicri:level="1"><inist:fA14 i1="01"><s1>Dynamic Motors and Vibroacouslic Laboratory, F.S.I., M B. Boumerdes University</s1><s3>DZA</s3><sZ>1 aut.</sZ><sZ>2 aut.</sZ><sZ>3 aut.</sZ><sZ>4 aut.</sZ></inist:fA14><country>Algérie</country><wicri:noRegion>Dynamic Motors and Vibroacouslic Laboratory, F.S.I., M B. Boumerdes University</wicri:noRegion></affiliation></author><author><name sortKey="Ouali Si Chaib, M" sort="Ouali Si Chaib, M" uniqKey="Ouali Si Chaib M" first="M." last="Ouali Si-Chaib">M. Ouali Si-Chaib</name><affiliation wicri:level="1"><inist:fA14 i1="01"><s1>Dynamic Motors and Vibroacouslic Laboratory, F.S.I., M B. Boumerdes University</s1><s3>DZA</s3><sZ>1 aut.</sZ><sZ>2 aut.</sZ><sZ>3 aut.</sZ><sZ>4 aut.</sZ></inist:fA14><country>Algérie</country><wicri:noRegion>Dynamic Motors and Vibroacouslic Laboratory, F.S.I., M B. Boumerdes University</wicri:noRegion></affiliation></author></analytic><series><title level="j" type="main">Journal of mechanical science and technology</title><title level="j" type="abbreviated">J. Mech. Sci. Technol. </title><idno type="ISSN">1738-494X</idno><imprint><date when="2011">2011</date></imprint></series></biblStruct></sourceDesc><seriesStmt><title level="j" type="main">Journal of mechanical science and technology</title><title level="j" type="abbreviated">J. Mech. Sci. Technol. </title><idno type="ISSN">1738-494X</idno></seriesStmt></fileDesc><profileDesc><textClass><keywords scheme="KwdEn" xml:lang="en"><term>Aircraft</term><term>Boussinesq model</term><term>Cobalt</term><term>Contact stress</term><term>Convolution</term><term>Crack</term><term>Dynamic load</term><term>Elastic shock</term><term>Experimental study</term><term>Heat source</term><term>Long term</term><term>Low speed</term><term>Material testing</term><term>Mechanical shock</term><term>Modeling</term><term>Refractory material</term><term>Room temperature</term><term>Rupture</term><term>Stress analysis</term><term>Superalloy</term><term>Thermal noise</term><term>Thermodynamics</term><term>Transfer function</term></keywords><keywords scheme="Pascal" xml:lang="fr"><term>Choc mécanique</term><term>Bruit thermique</term><term>Fissure</term><term>Long terme</term><term>Rupture</term><term>Température ambiante</term><term>Source chaleur</term><term>Charge dynamique</term><term>Choc élastique</term><term>Matériau réfractaire</term><term>Superalliage</term><term>Basse vitesse</term><term>Aéronef</term><term>Contrainte contact</term><term>Thermodynamique</term><term>Modèle Boussinesq</term><term>Convolution</term><term>Analyse contrainte</term><term>Modélisation</term><term>Fonction transfert</term><term>Essai matériau</term><term>Etude expérimentale</term><term>Cobalt</term><term>.</term></keywords><keywords scheme="Wicri" type="topic" xml:lang="fr"><term>Matériau réfractaire</term><term>Thermodynamique</term><term>Cobalt</term></keywords></textClass></profileDesc></teiHeader><front><div type="abstract" xml:lang="en">This work concerns the characterization of the thermodynamic behavior of the superalloy Airsist 215 (PN 3601669-7) containing cobalt. Such superalloys are used in aeronautical construction, in the hot parts of the turbine. They are frequently used for the production of the paddles. The parts in service are subjected to dynamic solicitations and thermal fluctuations over the course of time. They are responsible for modification and degradation of material properties. This can lead to the appearance of cracks and, in the long term, to the rupture of these parts. In this paper, a preliminary physical study is made on the appearance of the cracks, followed by experiments using shocks at ambient temperature and under a heating situation which simulates combustion. It is found that these dynamic loads have a significant impact on the development of the cracks that appear on the segments of the turbine nozzle. The study is devoted to the elastic shock of Hertz-Boussinesq extended to viscoelastic bodies by direct convolution of Riemann-Stielges. The interest resides in the local convolution and the distribution of stresses in the contact zone. The shock excitation method includes a deduced force in the load and disload phases. This force is an impulse which approaches a Dirac function. The sample can be modeled approximately by a system of one degree of freedom for natural frequency, damping and transfer function. The spectral response of the specified shock allows calculation of the damping. Every point of this spectrum gives the response for the linear system of the transfer function. Then, viscoelastic shock parameters are deduced.</div></front></TEI><affiliations><list><country><li>Algérie</li></country></list><tree><country name="Algérie"><noRegion><name sortKey="Nour, Abdelkader" sort="Nour, Abdelkader" uniqKey="Nour A" first="Abdelkader" last="Nour">Abdelkader Nour</name></noRegion><name sortKey="Chikh, Nouredine" sort="Chikh, Nouredine" uniqKey="Chikh N" first="Nouredine" last="Chikh">Nouredine Chikh</name><name sortKey="Lecheb, Samir" sort="Lecheb, Samir" uniqKey="Lecheb S" first="Samir" last="Lecheb">Samir Lecheb</name><name sortKey="Ouali Si Chaib, M" sort="Ouali Si Chaib, M" uniqKey="Ouali Si Chaib M" first="M." last="Ouali Si-Chaib">M. Ouali Si-Chaib</name></country></tree></affiliations></record>Pour manipuler ce document sous Unix (Dilib)
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