Abstract
Shear fracture mechanisms (in mode II) are usually observed in plain-concrete structures when subjected to impact loading of a rigid projectile. In the present work, an experimental method is proposed to characterise the confined dynamic shear strength and softening behaviour of concrete. A cylindrical specimen in which to circular notches are preformed is subjected to a dynamic loading through a Split Hopkinson Pressure Bar (SHPB) device. A cylindrical Hopkinson bar is used as input bar whereas a tube is used as output bar. The particle velocities measured by laser interferometers on both input and output bars allow the deduction of the shear stress in the ligament (fractured zone) and the axial displacement in the central zone beside the peripheral zones. Moreover an instrumented confining ring is used to induce a confining pressure on the fractured zone. This experimental method has been employed to characterize the dynamic shear strength of a common concrete at strain-rates as high as 100/s.
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