, une augmentation impnanae de la aille de Ia zone ptastique à ta pinte de la fissure En effet, les mesurs de rugosiae ont révélé qu'en mode tr pur, la taille de la zone plastique monotone suivant la direction de la préhssure peut atteindre, dans le cas de I'acier 316crry-fois la taille de la zone plastique eo mode I pur, LrBÀTsKrr ttlt 3

, La présenae étude a montré que le domaine de fissuration par fatigue en mode mixte est complexe et les resultats auxquels nous avons abouti à I'aide des éprouvettes du rype disqrae brésilien ne permenenr d'examiner qu

. Toutefois, ces résultats ouvrent la voie à d'autres érudes comme par exemple, I'influeoce du milieu ou I'influence des surcharges sur la propagation des fissurs de fatigue eo mode mixûe. l5l REFERENCRS BIBLIOGRAPHIQI, ES (l) EFTIS J. SUBRAMONIAN N

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*. O. and 2. *. ,

*. *. ,

K. Chargement-en-mode-mixte-a-panir, (103) deduisenr une solution dù premier ordre pour de faibles valeurs de la branche (b.2a) et de I'atrgle de bil-urcation (e < 18"). Les facteurs d'intensiÉ de.concrainte à I'extrêmité de la hssure branchê soumise à un cnargement biaxiale où la composante de mode I est maximale

T. , À -l)o_ : contrainte ponee par le plan de la fissure principale

L. Expressiorrs, 6) sont identiques à celle obrenues par COTTERELL et RICE, (lO4) à I'aide d'une méthode de perturbarions inspirée par BANICHLJK (105) Pour des angles de bifrucation plus grands, KARIHAIOO fait intervenir des termes correctifs, AU de second ordre

K. , =. ). Ar, and . Q{î,

=. Ku, +. Cr, and . Ar,

, Les coefficients Cij et Aû sont donnés sous forme de tableaux en fonctioo de 0 (tablea! A.4. On constate que les ternes cn AU n'interviennent sensiblement que pour des valeurs de I'angle de bifurcation sut

, K1, vol.102

*. Kp, *. Tg, and . Kn, , pp.2-2

A. ,

3. Acier,