Ciavarella, MicheleMicheleCiavarella2025-04-242025-04-242025-04-05Engineering Fracture Mechanics 321: 111055 (2025)https://hdl.handle.net/11420/55433Dynamic fracture depends on a delicate interplay of the dynamic Energy Release Rate (ERR) Gd which is the static value Gs as reduced by inertia terms depending on crack speed and sometimes acceleration, and the dynamic toughness Γd which generally varies with crack speed. We review some basic results on Double Cantilever Beam specimen, and make a simple analysis of a DCB under remote bending loads applied slowly. We comment that smooth propagation ensues here contrary to the case discussed in the literature where the loading the end by a constant displacement rate, a very complex non-linearly oscillating velocity results, possibly leading to crack arrest (stick–slip) and which is only partly captured by present models, making difficult the determination of the dynamic toughness.en0013-79442025Elsevierhttps://creativecommons.org/licenses/by/4.0/Crack propagation | DCB specimen | Dynamic crack propagation | InertiaTechnology::620: Engineering::620.1: Engineering Mechanics and Materials Science::620.11: Engineering MaterialsNatural Sciences and Mathematics::530: PhysicsJournal Articlehttps://doi.org/10.15480/882.1511210.1016/j.engfracmech.2025.11105510.15480/882.15112Journal Article