Abstract
This chapter presents a damage tolerance analysis approach for ensuring scarf repairs can meet the required damage tolerance and fatigue durability requirements in the presence of disbond. Both the static strength and fatigue endurance of scarf joints are strongly influenced by the length of initial disband length. Facture mechanics approaches, the virtual crack closure, and the cohesive element method, are presented to capture the strain energy release rate of bond line flaws. The predictive model using the cohesive element model offers a robust technique to account for the effect of disbond on the ultimate strength of scarf joints and repairs. The fatigue life of adhesively bonded composite scarf joints with disbands is shown to be well predicted by a crack growth model. Together these analysis methods provide the necessary tools for meeting the no-growth or slow-growth design requirement.
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