刚性弹丸侵彻钢筋混凝土的实验和简化分析模型

通过Φ57mm半穿甲弹对钢筋混凝土的垂直侵彻实验,得到了弹丸的撞靶速度、成坑深度、最大侵彻深度以及过载时程曲线等实验数据.对实验后钢筋的断裂特征进行分析,得到钢筋的典型破坏模式.将钢筋的破坏简化为弯曲+剪切断裂和弯曲+拉伸断裂这两种模式.根据混凝土侵彻模型和梁断裂失效理论,建立了刚性弹丸垂直侵彻钢筋混凝土的简化分析模型.将理论计算得到的侵彻深度、速度与过载时间历程分别与实验数据进行对比,结果表明两者吻合较好.研究表明,钢筋只对弹体侵彻过程产生局部影响,混凝土的抗侵彻阻力仍是钢筋混凝土抗侵彻阻力的主要组成部分.

Experiment and Simplified Analytical Model for Penetration of Rigid Projectile in a Reinforced Concrete Target

Experiments on perpendicular penetration of 57-mm-diameter semi-armor-piercing projectile in a reinforced concrete target were conducted. Striking velocity, impact crater depth, maximum penetration depth and penetration deceleration-time history of projectile were measured. Based on the analysis of rupture characteristics of steel bars subjected to projectile impact, a typical steel bar breakage model was obtained. The steel bars breakage model was simplified as following two models: bending plus shear rupture and bending plus tension rupture. A simplified analytical model for penetration in a reinforced concrete target subjected to rigid projectile impact was developed based on the penetration model for concrete target and the rupture failure theory for a beam. Prediction of penetration depth, velocity and penetration deceleration-time history from this model are in agreement with above-mentioned experimental data. Investigation indicates that the steel bars only contribute local effects on the penetration process. The resistance of concrete materials to penetration of projectile is the main component of resistance to penetration of projectile in a reinforced concrete target.