The present study is an experimental and computational investigation of shock wave propagation in multiphase suspensions. Particle suspensions are used as a means of obtaining a system in which there is limited initial inter-particle contacts with a large degree of parametric variability. The suspensions were prepared in ethylene glycol at several volume fractions (41%, 48%, and 54%) of silicon carbide particles, mixtures that have been shown to be shear thickening in rheological studies. The dynamic response of the shear thickening fluids is investigated in ranges of deformation relevant to ballistic impacts.A series of plate impact experiments were conducted to obtain the shock Hugoniots of the various suspensions at particle velocities in the range of 200-900 m/s. The experimental results show a transition in the wave propagation behaviour from a regime of propagation dominated by the compressibility of the liquid phase of the suspension to a regime where the response of the mixture becomes dominated by inter-particle contact networks. The transition in the shock Hugoniots of the suspensions indicates a shock-induced stiffening of the suspensions. In situ longitudinal and lateral stress measurements are made in the intermediate volume fraction suspension at two different impact velocities demonstrating a deviatoric stress component to the stress state within the suspension.Analytical and numerical models are employed to demonstrate the likely cause of the transition in the behaviour of the suspensions, resulting from the variation in the solid phase volume fraction of the suspension with increasing shock wave strengths. The results are discussed in terms of the development of extensive inter-particle contacts in a compression-induced mechanism analogous to classical shear thickening in dense suspensions. / Cette etude est une etude experimentale et numerique de la propagation des ondes de choc dans les suspensions polyphasiques. Des suspensions de particules sont utilisees comme un moyen d'obtenir un systeme dans lequel le contact initial entre les particules est limite et il y a un grand degre de variabilite parametrique. Les suspensions ont ete preparees dans l'ethylene glycol `a plusieurs fractions de volume (41%, 48% et 54%) de particules de carbure de silicium, des m´elanges qui se sont reveles etre rheoepaississantes dans les etudes rheologiques. La reponse dynamique des fluides rheoepaississents est etudiee dans une gamme des deformations pertinentes aux impacts balistiques.Une serie d'experiments d'impact de plaque ont ete menees pour obtenir les Hugoniots des chocs des differentes suspensions de particules a des vitesses dans l'ordre de 200-900 m/s. Les resultats experimentaux montrent une transition dans le comportement de propagation des ondes d'un regime de propagation domine par la compressibilite de la phase liquide de la suspension a un regime ou la reponse du melange devient dominee par les reseaux de contacts inter-particules. La transition dans le Hugoniots des choc des suspensions indique un choc induit par le raidissement de la suspension. Des mesures des contraintes longitudinales et laterales in situ sont en suspension dans la fraction volumique intermediaires a deux vitesses d'impact differentes demontrant une composante contrainte deviatorique a l'etat de stress au sein de la suspension.Des modeles analytiques et numeriques sont utilises pour demontrer la cause probable de la transition dans le comportement des suspensions, resultant de la variation de la fraction volumique de phase solide de la suspension avec des ondes de choc croissantes. Les resultats sont discutes en termes de developpement de contacts entre les particules etendu dans un mecanisme de compression induites par cisaillement classique analogue a un epaississement de suspensions denses.
| Identifer | oai:union.ndltd.org:LACETR/oai:collectionscanada.gc.ca:QMM.104531 |
| Date | January 2011 |
| Creators | Petel, Oren |
| Contributors | Andrew J Higgins (Supervisor) |
| Publisher | McGill University |
| Source Sets | Library and Archives Canada ETDs Repository / Centre d'archives des thèses électroniques de Bibliothèque et Archives Canada |
| Language | English |
| Detected Language | French |
| Type | Electronic Thesis or Dissertation |
| Format | application/pdf |
| Coverage | Doctor of Philosophy (Department of Mechanical Engineering) |
| Rights | All items in eScholarship@McGill are protected by copyright with all rights reserved unless otherwise indicated. |
| Relation | Electronically-submitted theses. |
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