Axial Crack Propagation and Arrest in a Pressurized Fuselage (September 1996)

摘要

A hybrid experimental-numerical investigation was undertaken to establish apractical crack kinking criterion in the presence or absence of multiple site damage (MSD) in a pressurized airplane fuselage. Ramlulu-Kobayashi crack kinking criteria was modified to predict self-similar crack propagation along a line of MSD and subsequent kinking near a tear strap. Instrumented biaxial test specimens and small-scale fuselage rupture experients were conducted to generate the crack kinking and crack velocity data which was then input to a large deformation, elasto-dynamic, finite element model of the fracture specimen. The computed Mixed-Modes I and II stress intensity factors and a large axial stress preceding the propagating crack were used to evaluate the self-similar crack extension and the crack kinking criterion along the crack trajectory. Excellent agreement was obtained between the predicted and measured crack kinking angles and locations. Additional verification was made through the match between the computed and measured strain gage data.