Damage tolerant design is a fracture mechanics based approach used in the aerospace industry. This type of design consideration is a leap forward technically compared to the safe life design criteria and requires the use of more advanced modelling tools.
The benefit of using these advanced BEASY modeling tools is found in the range and complexity of damage tolerant designs that can now be analyzed. Ultimately more accurate life predictions can be made resulting in better management of fleet maintenance programs. Additionally service related damage can be quickly assessed to assist with operational decisions.
BEASY’s FE Submodeling tools were used to create a local fracture model from a large section of the airframe finite element model (compatible with NASTRAN, ABAQUS, and ANSYS). The Finite Element mesh, results and loading were used to create a BEASY model representing the area containing the cracks and a crack growth simulation performed using the BEASY Fracture Workbench. This provided data on the stress intensity factors, critical crack sizes and residual strength of the structure using actual 3D geometry of the part and realistic loading obtained from the large scale FEM.