Op. Sovik et C. Thaulow, GROWTH OF SPHEROIDAL VOIDS IN ELASTIC-PLASTIC SOLIDS, Fatigue & fracture of engineering materials & structures, 20(12), 1997, pp. 1731-1744
The effect of void shape on the mechanical behaviour of an elastic-pla
stic solid containing an isotropic array of aligned axisymmetric voids
is examined. The mechanical response of such a material is studied by
means of finite element (FE) analyses of an elementary unit cell cont
aining an isolated void The void shape is found to have a strong influ
ence on both void growth rate and coalescence strain. This effect is s
trongest for low stress triaxialities. The numerical results are compa
red with analytical models of void growth, but none of the examined mo
dels give any good predictions of the results obtained numerically. A
simple modification of the classical Gurson model is suggested so as t
o give reasonable correspondence with numerical results. Finally, some
practical considerations of void shape effects are given.