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. .. Synthèse, 149 6.2.4 Intérêt du verre métallique comme élément de blindage, p.150

A. .. Post-mortem-des-faciès-de-rupture, 152 6.3.1 Évolution des coupelles et des cônes

, Morphologie

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, Les verres métalliques : vers une application défense

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, Pour compléter notre caractérisation, nous avons entrepris plusieurs campagnes d'essais laser dans le but d'étudier les processus d'endommagement et de rupture dynamique. Dans ce chapitre, il sera question d'étudier à plusieurs échelles les phénomènes de rupture engendrés par divers chargements laser. L'objectif final de ce chapitre sera d'apporter des éléments de réponses quant à l, Jusqu'à présent, nous avons principalement concentré notre attention sur la façon dont se propageaient les ondes de chocs dans les verres métalliques base zirconium

, « Le jour où la science commencera à étudier les phénomènes non physiques, elle fera plus de progrès en une décennie que dans tous les siècles précédents de son existence

T. |-nikola, , pp.1856-1943

, Les origines de la rupture : hypothèses et investigations, p.188

, Les verres métalliques : vers une application défense, p.188

, Comme suggère son intitulé, nous évoquerons dans ce chapitre les perspectives envisageables à ces travaux de thèse, Nous tâcherons de dégager plusieurs axes de réflexions pouvant aboutir à de futurs travaux de recherche

, Une structure à passer au crible À la suite de notre étude menée sur l'équation d'état de nos matériaux, plusieurs interrogations ont été soulevées et restent pour certaines en suspens. Nous proposons dans ce qui suit de passer en revue ces différents points, tout en apportant des pistes de réflexions quant aux potentiels travaux à mener

, Une ardente modélisation Tout d'abord, les résultats obtenus par compression quasi-isentropique et par choc pour les régimes R2 et R3 ont démontré une forte cohérence en dépit des différentes approximations formulées (adiabatique unique, approximation surface libre

B. Dans-le, étudier quantitativement les coupelles et cônes observées sur les surfaces de rupture des cratères en face arrière, un algorithme de détection basé sur la méthode des monts et vallées a été développé

, Initialisation */ Création d'une matrice [Z] à partir des hauteurs issues d'un fichier profilométrique

, Création d'une copie [Z1] de la matrice

, Détection des Extrema Globaux */ Recherche du maximum absolu Zmax de la matrice

, Recherche du minimum absolu Zmin de la matrice

, Édition de la matrice

, /*Détection des Coupelles*/ Tant que Min(i)[Z1]<Zmax //Min(i)

, Création d'une matrice voisinage [N] autour de l'actuel minimum absolu Min(i)

, Recherche dans [N] si un minimum a été précédemment détecté

, Si un minimum a déjà été détecté alors Recherche dans [N] de précèdents minima à une distance inférieure à, p.3

, Cette valeur a été déterminée par convergence. Vérifier dans la matrice [N] l'indice des minima les plus proches

, Attribution à Min(i) de l'indice le plus faible

, Indice relatif à la valeur du CC auquel appartient le minimum de l'itération i. Sinon Création d'un nouveau CC

, Fin Édition de la matrice [Z1] par la suppression du minimum Min(i) détecté

F. Fin, 1 -(a) Surface originale d'une zone du cratère en face arrière d'un verre métallique Z r 50 Cu 40 Al 10 . (b) Image créée après détection de contour par l'algorithme de détection. Dans les deux images, les axes verticaux et horizontaux sont exprimés en micromètres

, Les figures B.1 (a) et (b) illustrent respectivement l'image initiale et l'image créée après détection. Sur ces images la résolution d'un pixel est de 1 µm 2 et les hauteurs sont exprimées en micromètres. Concernant l'image contenant les indices des objets détectés, ceuxci sont représentés par leur contour, Une fois tous les pixels de l'image traités, la matrice [Z1] comporte les indices de chaque pixel correspondant à la coupelle ou au cône auquel il appartient

, Afin de pouvoir s'affranchir de ces objets peu représentatifs pour notre étude, nous avons ensuite soumis cette nouvelle image à des filtres morphologiques simples avant de pouvoir effectuer des calculs statistiques sur les objets restants

, Dans le but d'effectuer une première étude sur le sujet, nous avons décidé de nous concentrer sur les coupelles et les cônes présentant les géométries les plus régulières possible. Ainsi, les filtres « MinPerim » et « MeanPerim » ont été développé afin de pouvoir conserver uniquement les objets les plus réguliers, mais aussi étudier en détail les zones les plus proches de la zone d'initiation. La construction de ces deux filtres repose sur la, Au regard de la complexité des surface, de possibles interactions entre coupelles et cônes peuvent avoir lieu entrainant ainsi des recouvrements

. Le and . Minperim, Au-dessus de l'altitude de celui-ci, les pixels se retrouvent alors supprimés (cf. Fig. B.2 (c) et (d)). Il permet de conserver uniquement la géométrie suivant l

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. Figure-b, 3 -(a) Surface initiale à laquelle sont superposés les objets détectés par l'algorithme de détection. (b) Image finale conservée après application du filtre morphologique « MeanPerim

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