Often, the local effects of fracture mechanic strains can only be analyzed for very small or simple structures. Leichtwerk AG has a number of in-house procedures for performing fracture mechanic analyses on large complete structures like, for example, the rotor blades of offshore wind turbines with a blade length of over 60m.
These procedures have lead to significant improvements in the structural reliability, and subsequently the economic efficiency, of the turbines.
The analysis of delaminations between the layers of fiber reinforced structures requires a method which can be used in the post-processing stage of a standard FE analysis. The analysis involves the sectional forces that branch out during delamination.
A special bondline element that considers both branched structures as well as thick bondlines was developed for the ANSYS FE system. Furthermore, it allows a simple variation of the geometric crack front for crack propagation analysis.