平头弹撞击钢筋混凝土板的三维细观力学模拟

研究钢筋混凝土板在弹丸撞击作用下的响应和破坏对防护工程（核电厂安全壳）的安全计算和安全评估具有十分重要的意义.利用三维细观力学模型研究了平头弹以不同速度撞击钢筋混凝土板的开裂模式.假定混凝土是由砂浆基体、粗骨料和界面过渡层（ITZ）三相组成的复合材料，提出了三维三相细观力学模型的建模方法，并通过单元重构技术克服了ITZ层太薄而难以模拟的问题，从而大大提高了计算效率.结果表明：数值模拟再现了平头弹撞击钢筋混凝土板厚度方向的开裂破坏情况，模拟结果与实验观察具有良好的一致性.

3D Meso-Mechanical Modelling of Reinforced Concrete Slabs Subjected to by Flat-Ended Projectiles Impact

Investigations of the response and failure of reinforced concrete slabs under projectile impact are of great significance in the safety calculations and assessment in protective engineering especially in nuclear containment structures. This paper presents a numerical study on the crack pattern of reinforced concrete slabs struck normally by a flat-nosed projectile at different velocities using a 3D meso-mechanical model. The model was developed based on the assumption that concrete can be considered to be a three-phase material containing cement mortar, aggregates and interfacial transition zone. By employing element reconstruction technique, difficulty in simulating very thin ITZ layer has been overcome. It shows that the failure patterns of the reinforced concrete slabs from our numerical simulations are in good agreement with available experimental observations.