Studies of Impact-Induced Responses of a Generic Crushable-Rigid Rodlike Missile Against Rigid and Deformable Targets.

摘要

This study pertains to the analysis of ductile metallic panel protective structures which may be subjected to low-speed impact by missiles of various types and deformabilities,such as steel rods,pipes,poles,rotor blades,rotor disk fragments,aircraft,etc. Since a definitive evaluation of the accuracy and adequacy of theoretical methods for predicting the transient responses of the subject protective structures requires theoretical-experimental comparisons with appropriate well-defined transient structural response data,laboratory experiments to obtain such data were devised and carried out. A generic crushable-rigid rodlike missile consisting of a solid cylindrical front portion of semirigid polyurethane foam and an aluminum afterbody was designed and tested. High-speed Fastax photographs of this missile with markings on both the foam portion and the aluminum afterbody documented the responses of this type of missile during perpendicular impact against (a) a flat rigid barrier and (b) the midspan of thin deformable aluminum beams with both ends ideally clamped. Also obtained were transient beam profiles and records of transient strain and permanent strain at various spanwise stations of the beam specimens. (ERA citation 03:042866)