To improve the damage efficiency of compact terminal sensitive projectile withEFP warhead, it is vital to understand how the embedded structure (ES) affects the EFPforming performance. In this paper, the corresponding numerical investigation is focusedon, in which the fluid-structure interaction (FSI) method and the experimental verificationare used. Based on the obtained quantitative relations between the forming performance andα (the ratio of height to maximum radius of ES), an optimal design is further provided. Theresults indicate that: when the embedded structural length and width range 0.1-0.3D and0.1-0.2D (D: diameter of EFP warhead) at a fixed volume, respectively, EFP formingvelocity nearly keeps as a constant, 1760 m/s; the height of ES has a dramatic effect on thepropagating range of detonation wave, resulting in significant influence on the aerodynamicshape and length-to-diameter ratio of EFP; under the given constraints, the EFPlength-diameter ratio can reach the optimal value 2.76, when the height of ES is 0.22D.
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