*. T^u-;-d, vo : son J0 r(0) à la limite en u IV-a-15 IY -a-12

. Comme-|l^-*-u-"-*-=-!-!-u, ax=#,la vitesse de déformation au centre de la bande est exprimée par

. Sous-forme-dimensionnelle, IV-a-15 et IV-a-l6 s'expriment encore par : 7(o) = <o'l:ii

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