刚性弹丸斜撞击下混凝土板侵彻极限深度计算方法的对比验算

Verifying Calculations on Formulas of Oblique Penertation of Projectile into Eeinforced Concrete

弹丸斜侵彻钢筋混凝土的研究具有重要意义。为了分析典型的计算公式对于钢筋混凝土斜侵彻问题的适用性,对3个斜侵彻深度计算公式的构成形式、主要特点以及计算实例结果与试验数据的比较情况进行了讨论,明确了各计算公式的计算误差及适用范围。其中文献[3]公式预测值与试验数据吻合得最好。文中研究表明,由于初始倾斜角β的存在,使有效侵彻深度显著减小,且斜侵彻时侵深与正侵彻时侵深之间非简单余弦变化关系。

The observations for projectile oblique penetration into reinforced conerete（RC） target are interesting. For the sake of analyzing the applicability of the typical equations for oblique penetration of RC target, this paper particularly analyses the form, primary characteristic of three equations. The calculation results of these equations are compared with the test data and the application range and the predicting error of each equation is obtained. It is concluded that the predictions of Ref [3] equation fit best with the test data. The effects of the obliquity angle on penetration are analyzed based on numerical simulation calculation and the concrete material is described by Holmquist-Johnson-Cook model. The study shows that the effective penetration depth will be markedly reduced because of the occurrence of initial obliquity angle and the ricochet limit （critical obliquity angle βc） will exist. Moreover, un-cosine relationship of the oblique penetration depth with the vertical penetration depth is obtained.