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A theoretical study is presented herein on the penetration of a semi-infinite target by a spherical-headed long rodfor Yp > S,where Yp isthepenetratorstrengthand S isthe static target resistance.For Yp > S,depending upon initial impactvelocity,thereexistthreetypesofpenetration,namely,penetration by a rigid long rod,penetration by a deforming non-erosivelongrodandpenetrationbyanerosivelongrod.If the impact velocity of the penetrator is higher than the hydrodynamicvelocity(VH),itwillpenetratethetargetinanerosive mode;if the impact velocity lies between the hydrodynamic velocity(VH) and the rigid body velocity(VR),it will penetrate the target in a deformable mode;if the impact velocity is less than the rigid body velocity(VR),it will penetrate the target in a rigid mode.The critical conditions for the transition among these three penetration modes are proposed.It is demonstratedthatthepresentmodelpredictionscorrelatewell with the experimental observations in terms of depth of penetration(DOP) and the critical transition conditions.
A theoretical study is presented herein on penetration of a semi-infinite target by a spherical-dyed long rod for Yp> S, where Yp is the netter constantngnd S is the static target resistance. For Yp> S, depending upon initial impactvelocity, thereexistthreetypesofpenetration, namely, by a rigid long rod, penetration by a deforming non-erosivelongrodandpenetrationbyanerosivelongrod.If the impact velocity of the penetrator is higher than the hydrodynamicvelocity (VH), itwillpenetratethetargetinanerosive mode; if the impact velocity lies between the hydrodynamic velocity (VH) and the rigid body velocity (VR), it will penetrate the target in a deformable mode; if the impact velocity is less than the rigid body velocity (VR), it will penetrate the target in a rigid mode. The critical conditions for the transition among these three-penetration modes are proposed. It is demonstrated that present meditativelpredictionscorrelatewell with the experimental observations in terms of depth of penetration ( DOP) and the critical transition conditions.