Rrpure polyuréthanne avec I'utilisation de barres en PMMA. L'histogramme de fréquence montre que certaines valeurs sont relativement éloignées des autres ce qui nous a amené à utiliser la loi des valeurs extrêmes qui permet de tenir compte des phénomènes dont la probabilité d'apparition esr faible. Cette loi a été validée, dans notre cas par le test de Kolmogorov-Smirnov, Nous remarquons enfin ,
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