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. Fig and . Iv, 4 Figure de pôle pour M75-2(?) Les symboles ronds creux indiquent les plans qui ne diractent pas

. Fig and . Iv, 12 Figure de pôle pour T7(?) grain A. Les symboles ronds creux indiquent les plans qui ne diractent pas. Pr1, Pr2, Pr3 sont les axes de la presse (cf. Fig. IV.1). (Les grains B et C n

. Fig and C. Ivb, 15 Figure de pôle pour T75-1(?) Les symboles ronds creux indiquent les plans qui ne diractent pas. Pr1, Pr2, Pr3 sont les axes de la presse (cf. Fig

. Fig and . Iv, 18 Evolution microstructurale du grain A du tricristal T75-1(?) observée en X-durs refocalisés. Cliché de diraction à 5 taches permettant l'observation des plans d'axe de zone [11 ¯ 20]. L'observation avec fentes pour cette conguration est présentée sur la Figure IV

. Fig and . Iv, 27 Composantes du tenseur de courbure ? pour T75-1(?), grain A

. Fig and . Iv, 29 Composantes du tenseur de courbure ? pour T75-1(?), grain A, à t=39min et sous ?=0.24MPa. Tracé du logarithme des valeurs absolues des composantes ? ij avec couleur selon le signe de ? ij ; l'échelle donne la courbure en m ?1

. Fig and . Iv, 32 Simulation de la déformation du tricristal T75-1(?) par éléments nis (cf. Annexe VIII). a) maillage, contraintes normales calculées au contact plateaux/glace et contraintes principales de traction ; b) déformée du maillage pour un ?t arbitraire (champ des vitesses) ; c)

. Fig and C. Ivb, 34 Figure de pôle pour T75-2(?) Les symboles ronds creux indiquent les plans qui ne diractent pas. Pr1, Pr2, Pr3 sont les axes de la presse (cf. Fig

. Fig and . Iv, 43 Composantes du tenseur de courbure ? pour T75-2(?), grain A

. Fig and . Iv, 45 Composantes du tenseur de courbure ? pour T75-2(?), grain A, à t=19min et sous ?=0.3MPa. Tracé du logarithme des valeurs absolues des composantes ? ij avec couleur selon le signe de ? ij ; l'échelle donne la courbure en m ?1

. Fig and . Iv, 48 Simulation de la déformation du tricristal T75-2(?) par éléments nis (cf. Annexe VIII). a) maillage, contraintes normales calculées au contact plateaux/glace et contraintes principales de traction ; b) déformée du maillage pour un ?t arbitraire (champ des vitesses) ; c)

. Fig and C. Ivb, 50 Figure de pôle pour T18(?) Les symboles ronds creux indiquent les plans qui ne diractent pas. Pr1, Pr2, Pr3 sont les axes de la presse (cf. Fig

. Fig and . Iv, 52 Topogrammes des plans cristallins des grains du tricristal T15-1(?) avant et après déformation (grains B et C : nature des plans non déterminée)

. Fig and . Iv, 54 Topogrammes des plans cristallins des grains du tricristal T15-2(?) avant et en cours de déformation (grains B et C : nature des plans non déterminée). L'encart montre la déformation de T15-2(?) (clone) observé en lumière polarisée

. Fig and . Vii, Comparaison de diérents topogrammes du tricristal T7(?) avant compression Les topogrammes a) et b) ont pour axe de zone [10 ¯ 10], les topogrammes c) et d) ont pour axe de zone