Experimental and numerical study on the penetration and damage mechanism of linear shaped charge jet on steel plates

This study examines shaped charge penetration mechanics in steel targets through integrated experiments and simulations. Controlled detonation tests on 35MnB/1045 steel plates (18-40mm) with Cu, Pb, and Pb-Sb liners were combined with LS-DYNA's coupled Eulerian-Lagrangian modeling. Key findings reveal: 1) Penetration depth follows parabolic growth with charge density until cutting-dominated failure initiates at 200 g/m; 2) A critical 17 mm standoff maintains stable penetration, beyond which depth reduces 18.7%/mm, while thinning plates from 40 mm to 20 mm increases penetration by 62.3% via shear-bending failure; 3) Pb-Sb liners achieve 14.4% deeper penetration (58.0 mm) than Cu through optimized impedance properties, with dual-strand designs enhancing depth 38.8% via cumulative jet effects. Numerical validation identifies 0.5-0.8 GPa jet pressure thresholds (89-93% energy dissipation) aligned with microstructural evidence. The results demonstrate that material selection (Pb-Sb alloys) and geometric optimization (dual-strand configurations) significantly improve demolition efficiency.