Ductile Fracture of Dynamically Loaded Naval Structures-Compact Tension Specimen Tests and Analyses

摘要

A combined experimental/analytical research program aimed at extending the static J-integral to the case of dynamic inelastic fracture is described. This program was a first step toward the goal of quantifying the fracture response of naval structures containing flaws subjected to dynamic loading. One-inch thick HY-80 baseplate was used because of its known toughness and its widespread application in naval structures. For the experimental work, a drop weight test fixture was designed that permitted controllable, high rate loading of precracked compact tension specimens. A series of specimens was tested, and applied load, load point displacements, and back face strains were routinely measured with improving confidence and accuracy as the program progressed. For the analytical work, two-dimensional finite element analyses were performed in conjunction with the experiments in an effort both to further develop analytical techniques for dynamic fracture problems and to provide information on the specimen response in this test program. The analyses performed displayed variable correlation with the experimental results.