This book mainly introduces some basic phenomena and laws of highly ductile materials during elastoplastic deformation, and their engineering applications, such as the transfer and relief of stress concentration in the notch root, the mitigation of possible brittle fracture, the ductile deformation and damage, fatigue, energy absorption, plastic buckling, thermal stress problems, etc. It shows a number of revolutions in modern applications and design, which are beneficial to the safety of modern equipment, and improve applicability. In addition, the first three chapters of this book also briefly introduce the basic knowledge of elastoplastic deformation and analysis as a preliminary knowledge.  This book can be used as a textbook for advanced undergraduate students and postgraduate in non-mechanics majors such as mechanical engineering, power, material or civil engineering, as well as scholars and engineers in related fields.

Introduction.- Physical relationship in elastoplastic mechanics.- Solutions to the typical problem of elastoplasticity.- Transfer and Mitigation of Stress Concentration at the Root of a Notch for Highly Ductile Materials.- Elastic-Plastic Problems in the Manufacturing Process of Bimetal Composite Pipes.- Bending and Failure of Highly Ductile Pipes.- Effect of Defects on Pipe Bending Behavior.- Thermal Stress Problems.- Fatigue Behavior of Highly Ductile Materials.- Energy Absorption of Highly Ductile Materials.