Notice of RetractionShear response of a clamped beam subjected to intense dynamic loading with considering weakening effect of the shear sliding cross-section
The present paper, adopting a rigid, perfectly plastic idealization material model and a square yield locus, with the consideration of two conditions of weakening and non-weakening effects of transverse shear sliding section, analyses the shear response of a clamped beam in the initial plastic deformation stage subject to a uniformly distributed impulsive loading and the precondition of possible shear failure mode, writes the shear's movement equation, puts forward the expressions of shear velocity and shear sliding volume, finally the conclusion of the availability of different shear response model for weakening effect is drawn.
Shear Failure of a Free-Free Beam Subjected to Impact by a Projectile at the Mid-Span
Shear failure is an important mode of dynamic failure of structural members under impulsive loading.In this paper the non-dimensional criterion of the shear failure of a free-free beam subjected to impact by a projectile at the mid-span is presented.It is illustrated that whether a shear failure occurs at the interface,where the initial velocity has discontinuity,depends on the initial kinetic energy of the projectile,the mass ratio and the non-dimensional thickness of the beam.
Dynamic response of rectangular plates under drop mass impact
A theoretical analysis is presented which examines the dynamic response of thin rectangular plates struck transversely by a wedge. The analysis employs a pure membrane model with two traveling hinge phases. Material strain rate sensitive effects are considered with the aid of the Cowper-Symonds equation and the Perrone and Bhadra's approximation. A new phenomenon called effective area ratio has been found for relatively narrow plates. The displacement produced by traveling hinge phases is significant and dominant for high speed impact. Good agreement between the theoretical predictions and the experimental results has been obtained on the maximum permanent deflections for various impact energies.