The PER theory that developed to describe the collapse process of a conical shaped charge liner has been modified. New algorithms are used to determine the deflection angle, the collapse angle and the collapse velocity of each collapsed liner element. In the modified model, the liner is divided into n elements. For each element of collapsed liner, the main equations determining deflection angle, collapse angle, collapse velocity, jet velocity and jet mass are derived. These equations are arranged and compiled into a computer program. The input data to the program are easily determined.
The model is capable of predicting the changes of collapse velocity, jet velocity, and deflection and collapse angles, respectively, with relative axial position of liner element. The model is capable also of predicting the total mass of the formed jet. The predictions of the model are compared with numerical and experimental results of other investigators; good agreement is obtained. Moreover, representative samples of the model predictive results using small sizes and the 105 mm shaped charges, respectively, are presented and discussed.