The fracture behavior of the aluminum lined hoop-wrapped cylinders with internal axial cracks

Aluminum lined hoop-wrapped cylinders with internal axial semi-elliptical c racks in the cylindrical portion center of the aluminum-liner are modeled b y three dimensional finite element method. Crack front regions are modeled using singular elements, whereas the rest of the cylinder is modeled using twenty-node hexahedron elements. Not only the cylindrical body but also the neck and the transition areas of the cylinder are considered in the modeli ng. The stress intensity factor K-1 and the crack mouth opening displacemen t (CMOD) are calculated. The influence of the hoop-wrapped materials, the i nternal pressure and the crack sizes on the fracture behavior of the cylind er are discussed. (C) 1999 Elsevier Science Ltd. All rights reserved.