新型头形弹体对混凝土的侵彻

针对几种典型的新型头形弹体开展了对抗压强度为9.0、28.4MPa的混凝土靶的侵彻实验,通过观测回收弹体和解剖靶体,初步认识了新型头形弹体侵彻混凝土介质的侵彻机理。在此基础上,提出了混凝土强度弱化量纲一因子S2和头部小圆柱侵彻开孔半径bt,并基于空腔膨胀理论初步建立了新型头形弹体侵彻混凝土介质的理论分析模型。结果表明,对28.4MPa混凝土,理论预测结果与实验数据具有较好的一致性;对9.0MPa混凝土,理论预测结果与实验数据具有一定偏差,但仍可基本反映新型头形弹体的侵彻规律。最后分析了提高新型头形弹体侵彻性能的2个途径:减小S2和增大bt。

Penetration of cylindrical-nose-tip projectiles into concrete targets

Penetration experiments were conducted for several typical cylindrical-nose-tip projectiles (CNTP) into concrete targets with the compressive strengths of 9.0,28.4 MPa. The penetration mechanism was elementarily obtained by observing the recovered projectiles and the post-test targets. Thereby,a dimensionless parameter S2 was proposed to describe the target strength degradation and a parameter bt was brought forward to picture the cylindrical penetration pore radius. And then,the two parameters were introduced into the penetration formula by Forrestal et al to develop a new theoretical model for the penetration of CNTP into concrete. For the 28.4-MPa-strength concrete,the theoretical predictions by the new model agree well with the experimental data. For the 9.0-MPa-strength concrete,the theoretical predictions do not accord well with the experimental data but can still reflect the penetration mechanism of CNTP. Finally,two approaches were put forward for the penetration improvement of CNTP by decreasing S2 and increasing bt.