Thermomechanics & Infrared Imaging, Inverse Problem Methodologies and Mechanics of Additive & Advanced Manufactured Materials, and Advancement of Optical Methods & Digital Image Correlation, Volume 4 of the Proceedings of the 2021 SEM Annual Conference & Exposition on Experimental and Applied Mechanics, the fourth volume of four from the Conference, brings together contributions to this important area of research and engineering.  The collection presents early findings and case studies on a wide range of areas, including:Test Design and Inverse Method AlgorithmsInverse Problems: Virtual Fields MethodMaterial Characterizations Using ThermographyFatigue, Damage & Fracture Evaluation Using Infrared ThermographyMechanics of Additive & Advanced Manufactured MaterialsDIC Methods & Its ApplicationsPhotoelasticity and Interferometry ApplicationsMicro-Optics and Microscopic SystemsMultiscale and New Developments in Optical Methods