This book provides an in-depth exploration of advanced testing and analysis techniques applied to the mechanical properties of graphite structures utilized within nuclear reactors. It focuses particularly on the utilization of photogrammetric methodologies, such as digital image correlation, to assess the mechanical properties of both nuclear graphite and intricate graphite structures. The study encompasses a range of properties including elastic parameters, strength criteria, damage evolution laws, fracture toughness, and the contact strength and collision properties of nuclear graphite structures. This resource is tailored for structural designers and engineers working in the nuclear engineering sector, as well as undergraduate and graduate students pursuing studies in affiliated disciplines at academic institutions.