Different fracture performance of all-steel and all-aluminium cylinders with axial cracks

摘要

The linear elastic and the nonlinear elasto-plastic fracture mechanics analysis on all-metal (all-steel and all-aluminum) cylinder with different axially oriented cracks were carried out using the three-dimensional finite element method and theexperimental method. The crack mouth opening displacement CMOD and the crack driving forces (K{sub}I for elastic deformation state and J{sub}I for elasto-plastic deformation state) of the all-steel cylinder and the all-aluminum cylinder containing axialdeep cracks, were obtained. Through analysis of the calculated CMOD and crack driving forces for the all-steel cylinder and the all-aluminum cylinder with cracks, whose sizes are often met, respectively, in the engineering applications, the fracturebehaviors of the two kinds of all-metal cylinders are compared. The CMOD for the two kinds of all-metal cylinders with external axial cracks were measured by an experimental method and good agreements between the calculated CMOD and tested CMOD werereached. Some CMOD and crack driving force expressions about the crack sizes, internal pressure and location along the crack front are obtained.