Citation:
M. Boscolo, X. Zhang, A modelling technique for calculating stress intensity
factors for structures reinforced by bonded straps. Part II: Validation,
Engineering Fracture Mechanics, Volume 77, Issue 6, April 2010, Pages 896-907
Abstract:
In this second part of the two-part paper validation of the 2D FE modelling
technique described in the first part is presented for a range of test
configurations. Each mechanism that influences crack growth behaviour of strap
reinforced structures is modelled for different substrate geometries, strap
materials and dimensions in order to test the accuracy and robustness of the
methodology. First, calculated through-thickness strain energy release rate
distribution is compared with the result of a 3D FE model to validate this 2D
model. Second, calculated disbond areas, thermal residual stresses and their
redistribution with crack propagation are validated against experimental
measurements. Third, influence of geometric nonlinearity and the need to use the
alternate analysis method described in part I are demonstrated by examples, and
errors generated by not following this analysis rule are given. Finally, using
the 2D model calculated stress intensity factors, fatigue crack growth rates and
lives are predicted for different specimens, strap materials and applied stress
levels and are compared with the experimental tests. Good or acceptable
agreement has been achieved for each case.