Shear Stress Measurements in Stainless Steel 2169 under 1D Shock Loading

摘要

The material addressed in this research is stainless steel 2169, a 200 series stainless steel which has so far found applications in aviation, demolition, motor-vehicle design and nuclear reactor containment. Longitudinal and lateral stresses during the shock loading of 2169 have been measured using manganin stress gauges. The shock Hugoniot has been determined and is shown to be similar to other grades of steel in the longitudinal stress range ca. 2-18 GPa. The shear strength has been shown to increase with impact stress and it is seen that when compared with another common austenitic stainless steel (304 L) the initial HEL is greater, but that 2169 has a lesser degree of hardening with increased impact stress. This is discussed as being due to the relative stacking fault energies (SFE) of the two materials, with lower SFE leading to a greater degree of deformation twinning and therefore an increase in twin and dislocation interactions.