The discussion focuses on the relationship between strain rate and the strength of typical steel grades, specifically yield and tensile strength. It is established that as strain rates increase, the generation of dislocations and defects also rises, leading to work hardening. The key mechanism involves dislocation pile-up, where an increased dislocation density enhances strength due to insufficient diffusion to grain boundaries. This phenomenon is not limited to steel but is observed across various metals and polymers.
PREREQUISITESMaterials scientists, mechanical engineers, and researchers focused on the mechanical properties of metals and polymers, particularly those studying the effects of strain rates on material strength.
The effect of increasing yield and tensile strength with increasing strain/strain rate is observed in many, if not most, metals, and even polymers.SteveO said:I was wondering exactly how yield and tensile strength increases with increasing levels of strain rate for a typical steel grade? I understand dislocations are generated during straining (work hardening), but what happens at higher strain rates which increases the strength?