He Yanghua, Liu Zhenyi, Li Mingzhi, Li Pengliang, Zhao Yao, Liu Qiqi, Liu Chuang, Ye Ping
State Key Laboratory of Explosion Science and Technology, Beijing Institute of Technology, Beijing 100081, China.
Materials (Basel). 2023 Apr 8;16(8):2966. doi: 10.3390/ma16082966.
The paper presents the damage results of thick steel plates subjected to local blast loading using experimental and numerical approaches. Three steel plates with a thickness of 17 mm under the local contact explosion of trinitrotoluene (TNT) explosives were tested, and the damaged parts of the steel plates were scanned using a scanning electron microscope (SEM). ANSYS LS-DYNA software was used to simulate the damage results of the steel plate. By analyzing and comparing the experimental results with the numerical simulation results, the influence law of the TNT acting on the steel plate, the damage mode of the steel plate, the reliability verification of the numerical simulation, and the criterion for judging the damage mode of the steel plate were obtained. Results show that the damage mode of the steel plate changes with the changes in the explosive charge. The diameter of the crater on the surface of the steel plate is mainly related to the diameter of the contact surface between the explosive and the steel plate. The fracture mode of the steel plate in the process of generating cracks is a quasi-cleavage fracture, and the process of generating craters and perforations in the steel plate is a ductile fracture. The damage mode of the steel plates can be divided into three types. The numerical simulation results have minor errors and high reliability, and numerical simulation can be used as an auxiliary tool for experiments. A new criterion is proposed to predict the damage mode of the steel plates under contact explosion.
本文采用实验和数值方法，给出了厚钢板在局部爆炸载荷作用下的损伤结果。对3块厚度为17mm的钢板进行了三硝基甲苯（TNT）炸药局部接触爆炸试验，并利用扫描电子显微镜（SEM）对钢板的损伤部位进行了扫描。采用ANSYS LS-DYNA软件对钢板的损伤结果进行了模拟。通过对实验结果与数值模拟结果的分析比较，得出了TNT作用于钢板的影响规律、钢板的损伤模式、数值模拟的可靠性验证以及钢板损伤模式的判定准则。结果表明，钢板的损伤模式随炸药量的变化而变化。钢板表面弹坑直径主要与炸药和钢板接触面直径有关。钢板产生裂纹过程中的断裂模式为准解理断裂，钢板产生弹坑和穿孔过程为韧性断裂。钢板的损伤模式可分为三种类型。数值模拟结果误差较小，可靠性较高，数值模拟可作为实验的辅助工具。提出了一种新的准则来预测钢板在接触爆炸下的损伤模式。
