Micromechanisms of Fracture and Fatigue : In a Multiscale Context Micromechanisms of Fracture and Fatigue forms the culmination of 20 years of research in the field of fatigue and fracture. It discusses a range of topics and comments on the state of the art for each. The first part is devoted to models of deformation and fracture of perfect crystals. Using various atomistic methods the theoretical strength of solids under simple and complex loading is calculated for a wide range of elements and compounds and compared with experimental data. The connection between the onset of local plasticity in nanoindentation tests and the ideal shear strength is analyse