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Fracture toughness and fatigue crack growth tests and numericalsimulations on 3PB specimens were carried out to study the fracture behaviour for acrack lying perpendicular to the interface in a ductile/brittle bimaterial.Polymethylmethacrylate Acrylic (PMMA) and aluminium alloy 2024 T531 were joinedtogether using epoxy resin. A precrack was introduced into the ductile material andtests were carried out to obtain fracture toughness and fatigue properties. The bodyforce method was used to simulate the experimental stress intensity K1 crackingbehaviour under monotonic and cyclic loads. It was found that the bimaterial fatiguecrack growth rate is higher than that for monolithic aluminium 2024 but lower than therate for a monolithic PMMA material. This agreed with the trend for the stress intensityresults and it was in agreement with the numerical analysis. The initial ductile Mode 1aluminium stable cracking appear to ‘jump’ the interface and continued under fracturemodes 1 and 2 in the PMMA material until final failure.