Plastic Deformation and Strain Hardening This publication is based upon lectures given during a well received course on physical metallurgy and originally intended for students specializing in fields related to metallic materials. But as the author points out metallic materials are the most widely investigated group of materials and their study therefore gives a good basis for understanding how other materials can be made to reveal interrelationships between their structures and properties; especially with regard to those properties associated with strain. Similar types of rule can then be applied to other materials in spite of their apparent differences. Encouraging results of this approach have been applied in recent decades to ceramics polymers and even complicated natural composites such as wood. Strain hardening due to plastic deformation is identified by the author as being the key phenomenon as it often makes constructions viable in spite of design errors. For this reason strain hardening in all of its manifestations is taken to be the central theme. Each chapter is backed up by relevant exercises thus making the whole a valuable and stimulating pedagogic experience. A textbook for a physical metallurgy course on strain hardening due to plastic deformation which from the perspective of construction design makes many constructions hold despite errors by designers in dimensioning those constructions. It is not indexed.