Stress intensity factor solutions to cracks emanating from multiple collinear holes

摘要

Periodic collinear edge hole cracks and arbitrary small cracks emanating from collinear holes, which are two typical multiple site damages (MSD) occurred in the aircraft structures, are studied by using the weigh function method. An explicit closed form weight function for periodic edge hole cracks in an infinite sheet is obtained and further used to calculate the stress intensity factors for various loading cases. An approximate weight function method is also proposed for arbitrary small cracks emanating from multiple collinear holes. Compared to finite element method, the present weight functions are accurate and highly efficient in calculating the stress intensity factors for any crack length under arbitray mode I loading case and therefore poviding an useful tool for ananlyzing MSD.