Ward and Sweeney, both affiliated with the IRC in Polymer Science and Technology at the University of Leeds, UK, introduce the mechanical behavior of solid polymers, adding new material on mechanical relaxations and anisotopy, composites modeling, nonlinear viscoelasticity, and fracture of tough polymers to this second edition. The accessible approach of the book has been retained for this edition, with each chapter designed to be self-contained and the theory and applications of the subject introduced where appropriate. Chapter problems and mathematical appendices are included. The book is for students of materials, chemistry, physics, and engineering.