基于层裂机理的弹体侵彻混凝土的工程模型

Engineering model of projectile penetrating into concrete based on splitting mechanism

以斜侵彻过程中的终点弹道为研究对象,基于动态球形空腔膨胀理论给出的阻力函数理论公式和开坑阶段的表面层裂机理,建立了能够综合考虑弹头形状、开坑区深度的斜侵彻深度预测模型,并进一步推导了能够适用不同弹头形状的弹体过载时程曲线计算公式。预测模型得到的侵彻深度和过载与试验结果吻合较好。研究结果可为弹体与混凝土靶的斜侵彻弹道分析和弹丸头部设计提供一定帮助。

Based on the theoretical resistance function from dynamic spherical cavity expansion model and the surface splitting mechanism, a prediction model was proposed for oblique penetration depth of rigid projectiles into concrete targets. In the proposed formula, the dimensionless coefficients denoting the projectile nose geometry were introduced to consider the variation of projectile nose geometry and the cratering depth. A prediction model for the decelerationtime history of the projectile with different nose geometries was obtained. The penetration depths and overload curve of the model were in good agreement with the test results. The research results can provide some help for the oblique penetration trajectory analysis and the design of the projectile head.