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Fracture toughness tests were performed on Al 2 O 3 /Nb sandwich specimens using chevron-notched bending bars. These tests allow the independent determination of the fracture toughness  K  c  at a defined crack velocity and the total work of fracture  J  c . The  J  c  values are much greater than the data for the energy release rate  G  c  following from  K  c . The fracture surfaces were studied by optical and scanning electron microscopy. The results are discussed in terms of the fracture toughness of cleavage in the Al 2 O 3  and severe plastic deformation in the Nb sheet.

Fracture parameters of chevron-notched Al 2 O 3 /Nb sandwich specimens