This book studies metallic and composite materials and their mechanical properties in terms of stiffness and strength, illustrated through several case studies and exercises. Rheology, Physical and Mechanical Behavior of Materials 4 focuses on the replacement of metal and wood products with fiber composites, which offer highly interesting directional mechanical properties. It studies various tests used to characterize the fiber-bonding pair in orthotropic layers and axes and also presents methods used to obtain stiffness and flexibility matrices, maximum stresses and deformations, and rupture envelopes. Finally, it presents various laminates, such as membrane and bending plates, tubular torsion, beat, buckling, twisting and sandwich structures. This book is aimed at researchers involved in the mechanics of deformation, those studying or teaching this topic and industrial design and manufacturing departments.