Effect of crystallographic anisotropy and irradiation on fatigue and fracture of metals

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Real materials are complex, inhomogeneous collections of highly anisotropic crystallites. Their mean response may approach the isotropic behaviour often assumed in practical applications.  However, many responses cannot be understood without accounting for the inherently inhomogeneous behaviour. Texture development, earring, intergranular failure, stress corrosion cracking and many other effects are dependent not on average stress, but rather on the local behaviour and the distribution of stresses around the average. When such materials are subjected to cyclic loading, they undergo irreversible microstructural change. After a number of fatigue cycles, cracks initiate and propagate through the specimen until failure occurs - this is the topic of the research program.