Abstract In this study, the impact of a steel spherical projectile on an alumina ceramic is considered. New experimental and numerical results are presented and analysed. Numerical results are obtained using the Finite Element Method and the upgraded viscosity regularized Johnson-Holmquist-2 constitutive model to describe the ceramic material behaviour. First, a short investigation is done using 2d Finite Element simulations to establish a proper numerical framework. Second, the numerical framework is extended to 3d and experimental results are used to validate the framework and the ceramic material model. This shows that all relevant ceramic failure mechanisms are captured correctly and the framework and model can be used to simulate sphere impact on ceramic material. Third, the simulations are used to analyse the failure processes in the ceramic material in more detail. Here the focus lies in obtaining information which can currently not be retrieved from experiments. Timing and interaction of propagating conical and radial cracks are investigated and corroborate with the typical failure mechanisms observed in sphere impact on ceramic material.

中文翻译：

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球体撞击氧化铝陶瓷的实验与数值研究

摘要 本研究考虑了钢球弹丸对氧化铝陶瓷的影响。提出并分析了新的实验和数值结果。数值结果是使用有限元方法和升级的粘度正则化 Johnson-Holmquist-2 本构模型获得的，以描述陶瓷材料的行为。首先，使用二维有限元模拟进行了简短的调查，以建立适当的数值框架。其次，将数值框架扩展到 3d，并使用实验结果来验证框架和陶瓷材料模型。这表明所有相关的陶瓷失效机制都被正确捕获，框架和模型可用于模拟球体对陶瓷材料的影响。第三，模拟用于更详细地分析陶瓷材料中的失效过程。这里的重点在于获取目前无法从实验中检索到的信息。研究了传播锥形和径向裂纹的时间和相互作用，并证实了在球体对陶瓷材料的冲击中观察到的典型失效机制。