Book excerpt: The small punch test (SPT) is useful to calculate changes in the tensile and fracture properties of structural materials during the service life of the materials of plant components. This book compiles advances in the development of correlations to calculate mechanical properties of the materials using SPT data. New correlations have been developed using hybrid methodology involving analytical and experimental data. The newly developed correlations have been tested conducting case studies on SPT and pre- cracked/ notched SPT (p- SPT) specimens. The eventual applications of all the new correlations have been demonstrated by conducting a real- life case study involving degradation of structural material from ductile to semi- brittle state due to aging. Features: • Presents exclusive material on the remnant life assessment of in- service materials using SPTs. • Assesses the fracture toughness of ductile materials using the experimentally measured biaxial fracture strain. • Provides new equations to calculate the yield and ultimate stresses of copper and titanium alloys using measured SPT data. • Explores functions to correlate the load- displacement data of p- SPT specimens with fracture properties. • Includes case studies with direct relevance to the degradation of plant materials. This book is aimed at researchers, professionals, and graduate students in materials science and engineering, mechanical property characterization and testing, and small- scale experimentation. It is expected that the advanced methodology presented in this book to evaluate changes in the properties of aged materials during the service life using SPT data are useful to designers for safety evaluation and also to calculate the remaining service life of industrial components for life extension studies.