Focuses on state-of-the-art testing techniques for characterizing the multiaxial fatigue and deformation behaviors of monolithic and composite materials. 14 peer-reviewed papers deal with both experimental and theoretical aspects of the multiaxial fatigue and deformation behaviors of structural materials. In 4 sections: Multiaxial Testing Facilities; • Multiaxial Deformation; • Multiaxial Fatigue; and • Structural Failure and Crack Propagation Under Multiaxial Loading.