Rig Design for Mechanical Engineering is an important and necessary issue in various engineering fields. All engineers and professionals need the basic knowledge about this subject to improve their skills and practice on how to establish their own test rigs in terms of design and material requirement (Composite Materials), process and control tooling, manufacturing, measuring instruments, equipment, and the use of sophisticated and skillful computer software programs. The reader is assumed to be familiar with the preliminary courses of composite materials. In order to cover most types of experimental test rigs used in for the composite materials research works, this book is divided into three chapters: Chapter one is about Polymer Composite Materials topic presented in terms of three cases, chapter two is about Fatigue Strength of Composite Materials topic introduced in terms of two research studies, and chapter three is about Temperature Effects on Composite Materials topic demonstrated in terms of two research investigations.