Angle of incidence effects for underwater shock using generic computational models, rev. 1
Abstract
The modeling techniques used to develop several generic models of the shock response of submarines are described. The result is three overlapping models: (1) CAPS, in which the directly arriving shock wave is applied to a rigid capped cylinder that contains a large spring supported mass; (2) REFLECT, in which a rigid cylinder capped by hemispheres is subjected to direct and reflected shock waves resulting from an explosive source at an arbitrary location; and (3) TDEF, in which the directly arriving shock wave drives a deformable capped cylinder that is modeled by a combination of rigid body modes, beam modes, and axisymmetric shell modes. How the computer programs for these models provide the ability to perform damage assessments, is described, particularly regarding the significance of angle of incidence. Each computer code evaluates the temporal response of the structure for an explosive source situated at a specified angle relative to the axis. Results are evaluated for the center of mass and points at each end of the cylindrical segment. When a sequence of heading angles covering a quarter circle is input, the magnitude of the instantaneous (vector) velocity and acceleration at each point is monitored for its maximum value.
 Publication:

Presented at the 55th Shock and Vibration Symp
 Pub Date:
 February 1985
 Bibcode:
 1985shvi.sympR....R
 Keywords:

 Angles (Geometry);
 Angular Resolution;
 Blast Loads;
 Computerized Simulation;
 Explosions;
 Incidence;
 Shock Waves;
 Submarines;
 Antisubmarine Warfare;
 Damage Assessment;
 Underwater Explosions;
 Fluid Mechanics and Heat Transfer