Dynamic Behavior of Materials, Volume 1 of the Proceedings of the 2025 SEM Annual Conference & Exposition on Experimental and Applied Mechanics, the first volume of five from the Conference, brings together contributions to this important area of research and engineering. The collection presents early findings and case studies on fundamental and applied aspects of Experimental Mechanics, including papers on:Dynamic Behavior of: Additively Manufactured Materials, Composites, Geomaterials and Low Impedance MaterialsDynamic Investigations for Traumatic Brain InjuryFracture and Failure of Polymer Matrix Composites/ Ceramics/ MetalsHybrid Experimental-Analytical TechniquesIndustrial ApplicationsQuantitative Visualization of Dynamic EventsNovel Testing TechniquesOrthopedic BiomechanicsShock and Blast