Anisotropy of the fracture toughness of structurally inhomogeneous ageing alloys

The dependence of the fracture toughness K _1C of rolled ageing alloys with structural and crystallographic textures on the loading direction is established. A formula describing the anisotropy of the K _1C and including structural parameters of structurally textured alloys on planes of growth of mode I cracks is derived and validated for aluminum alloys. The influence of crystallographic planes and crack growth direction on K _1C is analyzed for titanium alloy as a rolled material with crystallographic texture