Penetration of long rods into semi-infinite metallic targets over wide range of impact velocities

Document Type : Original Article


1 Weapons and Amm. Dept., Mechanical Engineering Branch, Military Technical College, Kobri El-Kobba, Cairo, Egypt.

2 Weapons and Amm.Dept., Mechanical Engineering Branch, Military Technical College, Kobri El-Kobba, Cairo, Egypt.



In this paper, the analytical model that describes the penetration process of a long rod into a semi-infinite metallic target over wide range of impact velocities has been presented. In this model, the target strength factor Rtis not considered as a constant but it is a function of penetration velocity whereas, the rod strength factor YP is represented by Hugoniot Elastic Limit (HEL) of its material. The penetration process of the present model consists mainly of primary phase during which the rod front is subjected to erosion and secondary (after-flow) phase. The main equations of the used model are presented, arranged and compiled into a computer program. The program is capable of predicting the time histories of the parameters associated with the penetration process. Autodyn hydrocode package is used herein to simulate the penetration processes of long rods into targets examined by the present analytical model. The hydrocode is fed with the same data used in the model for rods and targets materials. Both the model predictions and the obtained numerical results of Auto dynhydro code, respectively, are compared with the corresponding experimental measurements of other investigators. Good agreement is generally obtained. In addition, representative samples of the model predictions and their corresponding simulation results of Autodyn hydro code are presented with relevant analyses and discussions. The obtained results prove the predictive capabilities of both the present model and Autodyn hydro code, respectively, where each of them could be used as a quick tool for determining the main parameters associated with the studied penetration process.