Preface Advancement of Optical Methods & Digital Image Correlation in Experimental Mechanics represents one of seven volumes of technical papers to be presented at the SEM 2020 SEM Annual Conference & Exposition on Experimental and Applied Mechanics organized by the Society for Experimental Mechanics scheduled to be held in Orlando, FL, September 14– 17, 2020. The complete proceedings also include the following volumes: Dynamic Behavior of Materials; Challenges in Mechanics of Time-Dependent Material; Fracture, Fatigue, Failure and Damage Evolution; Mechanics of Biological Systems and Materials, Micro- and Nanomechanics & Research Applications; Mechanics of Composite, Hybrid & Multifunctional Materials; and Thermomechanics & Infrared Imaging, Inverse Problem Methodologies and Mechanics of Additive & Advanced Manufactured Materials. Each collection presents early findings from experimental and computational investigations on an important area within experimental mechanics, with optical methods and digital image correlation (DIC) being important areas. With the advancement in imaging instrumentation, lighting resources, computational power, and data storage, optical methods have gained wide applications across the experimental mechanics society during the past decades. These methods have been applied for measurements over a wide range of spatial domain and temporal resolution. Optical methods have utilized a full-range of wavelengths from X-ray to visible light and infrared. They have been developed not only to make twodimensional and three-dimensional deformation measurements on the surface, but also to make volumetric measurements throughout the interior of a material body. The area of digital image correlation has been an integral track within the SEM Annual Conference spearheaded by Professor Michael Sutton from the University of South Carolina. The contributed chapters within this section of the volume span technical aspects of DIC. The conference organizers thank the authors, presenters, and session chairs for their participation, support, and contribution to this very exciting area of experimental mechanics. Taichung, Taiwan Ming-Tzer Lin Worcester, USA Cosme Furlong Hsinchu, Taiwan C.-H. Hwang v
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