改写这段话300字：In the process of hypervelocity impact the target is under the action of high temperature high pressure and high strain rate1-3 On the macro level shear fracture and spalling will occur And

During hypervelocity impact, the target experiences high temperature, pressure, and strain rate. These conditions cause macro-level shear fracture and spalling, as well as micro-level grain deformation, fragmentation, and phase transformation. These changes are closely related to the physical and mechanical properties of the projectile and target, as well as the collision conditions. Ultimately, the pressure at the projectile-target interface during the collision process is the main controlling factor for the changes that occur. This pressure is affected by factors such as collision speed, projectile-target density, and shock wave speed. The instantaneous change in pressure causes adiabatic heating of the material, leading to damage under high temperature and pressure. Therefore, studying the main control parameters of the collision process and determining their relationship with collision pressure can lead to obtaining a pressure equation for typical metal materials in the collision process. This equation can help establish the relationship between the failure performance and collision speed of the target plate.