Pm. Vargas et Rh. Dodds, INELASTIC RESPONSE OF A DEEP CRACK SINGLE-EDGE NOTCH SPECIMEN UNDER IMPACT LOADING, Journal of offshore mechanics and Arctic engineering, 117(3), 1995, pp. 205-211
Three-dimensional dynamic analyses are performed for a single-edge ben
d, SE(B), fracture specimen (a/W = 0.5) subjected to impact loading. L
oading rates obtained in routine drop tower tests (terminal load-line
velocity of 100 in./s or 2.54 m/s) are applied in the analyses. Explic
it time integration coupled with an efficient element integration sche
me is used to compute the dynamic response of the specimen. Strain-rat
e sensitivity is introduced via a new, efficient implementation of the
Bodner-Partom viscoplastic constitutive model. Material properties fo
r A533B steel (a medium strength pressure vessel steel) are used in th
e analyses. Static analyses of the same SE(B) specimens provide baseli
ne results from which inertial effects are assessed. Similarly, dynami
c analyses using a strain-rate insensitive material provide a referenc
e for the assessment of strain rate effects. Strains at key locations
and the support reactions are extracted from the analyses to assess th
e accuracy of static formulas commonly used to estimate applied J valu
es. In ertial effects on the applied J are quantified by examining the
acceleration component of J. Results show that dynamic effects for th
e steel analyzed are negligible after twice a characteristic time that
can be defined in terms of the first elastic period of the specimen.