The mechanical properties of (Cu_0.47Zr_0.45Al_0.08)₉₈Dy₂ bulk metallic glass (BMG) were characterized under various strain rates by quasi-static and dynamic compressive tests. In the quasi-static compressive tests, the yield stress of (Cu_0.47Zr_0.45Al_0.08)₉₈Dy₂ BMG increased from 1234 MPa to 1844 MPa when the strain rate was increased from 0.001 s⁻¹ to 0.01 s⁻¹, and the yield stress decreased to 1430 MPa at the strain rate of 0.1 s⁻¹. In the dynamic compressive tests, when the strain rate increased from 1550 s⁻¹ to 2990 s⁻¹, the yield stress of (Cu_0.47Zr_0.45Al_0.08)₉₈Dy₂ BMG first decreased from 1508 MPa to 1404 MPa, and then increased to 1593 MPa. The fracture behaviors of (Cu_0.47Zr_0.45Al_0.08)₉₈Dy₂ BMG were studied by using scanning electron microscopy to examine the fracture surface. Fracture occurred in the pure shear mode with strain rates below 2100 s⁻¹, whereas shear fracture and normal fracture occurred simultaneously under strain rates of 2650 s⁻¹ and 2990 s⁻¹.

The penetration and reaming performance of a toroidal explosively formed projectile (TEFP) warhead with a charge diameter (D) of 56 mm was investigated when it was used to penetrate Q235 steel targets that were 10 mm thick at different stand-off distances (h). Thought the experimental and numerical result, the formation and penetration mechanisms of TEFP was revealed, and the differences between the radial and axial velocities in various portions of the TEFP were the primary causes of the TEFP expansion and rupture. When the TEFP tail has not completely ruptured and detached (h < 2.14D), TEFP has a strong penetration ability, resulting in TEFP perforating the target plate. The perforation process included three phases: pit opening, plastic hole expansion, and shear-block formation; these phases had average energy consumption ratios of 26.0%, 56.8%, and 17.2%, respectively. Finally, a method of evaluating the perforation and reaming capability of the TEFP was developed and used to identify the optimal stand-off distance, h₀ = 1.96D, which produced a penetration hole with a diameter of 1.875D.