Abstract
This chapter discusses the dynamic finite element and dynamic photo-elastic analyses of an impacted pretensioned plate. The dynamic photoelastic experiments involve subcritically loaded single-edged notch tension specimens where crack propagation was initiated by an impacted flat-nosed projectile or a 65° wedge. The dynamic finite element code used in this investigation was based on an explicit time integration scheme and constant strain quadrilateral elements. The crack tip motion was modeled by discontinuous jump swhere crack tip moved from one finite element node to another at discrete time intervals. This discrete propagation of the crack tip generated significant oscillations in the states of stress and displacement surrounding the crack tip. A combination of dynamic finite element analysis and dynamic photoelasticity results provide a procedure in which the dynamic state prior to the triggering of the dynamic polariscope could be estimated by some trial and error.
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