The rigid projectile penetration into thick concrete targets was studied through static deep indentation and terminal ballistic tests with small-diameter projectiles. This work aims to investigate the correlation between indentation and penetration for concrete. First, ballistic penetration tests were conducted to obtain the dynamic impact test data including depth of penetration (DOP) and crater dimensions. Second, a sequent static deep indentation test on the concrete target was also carried out. The net axial resisting force was calculated from the recorded force-displacement history considering the effect of friction on static indentation. The resistance measurement was in good agreement with the ones from the ballistic tests suggesting that the static deep indentation tests can be used to estimate the target strength parameter $R$ (Forrestal et al. 2003) of penetration resistance. Third, both the penetration and indentation tests were numerically studied by using the recently developed Lattice Discrete Particles Model (LDPM). LDPM is a discrete model built upon the internal structure of materials at mesoscale with inter-particle constitutive laws accounting for tensile cohesive fracture between aggregates, strain hardening in compression and compaction due to pore collapse. Numerical simulations of the penetration tests were validated by comparing the numerical results with the experimentally recorded DOP and crater damage contour. Moreover, the indentation simulation well captured the force-displacement curve with friction subtracted. Finally, the correlation between the penetration resisting force and static indentation load was further validated by extensive numerical simulations.

通过静态深压痕和小直径弹丸的末端弹道试验研究了刚性弹丸对厚混凝土靶的渗透。这项工作旨在研究混凝土的压痕和渗透之间的相关性。首先，进行了弹道穿透测试，以获得包括穿透深度（DOP）和弹坑尺寸的动态冲击测试数据。其次，还对混凝土靶进行了随后的静态深压痕试验。考虑到摩擦力对静态压痕的影响，根据记录的力-位移历史计算出轴向净阻力。电阻测量值与弹道测试中的测量值非常吻合，表明可以使用静态深压痕测试来估算目标强度参数$\mathrm{[R}$（Forrestal et al。2003）。第三，使用最近开发的格子离散粒子模型（LDPM）对渗透和压痕测试进行了数值研究。LDPM是建立在介观尺度上材料内部结构的离散模型，其中颗粒间的本构规律考虑了聚集体之间的拉伸内聚破裂，压缩过程中的应变硬化以及由于孔塌陷而造成的压实。通过将数值结果与实验记录的DOP和弹坑损伤轮廓进行比较，验证了渗透测试的数值模拟。此外，压痕仿真很好地记录了力-位移曲线，减去了摩擦。最后，