活性粉末混凝土抗多次侵彻实验研究及数值预测  

Experimental investigation and numerical prediction on resistance of reactive powder concrete to multiple penetration

作　　者：徐世烺[1] 吴平[1] 周飞[1] 李庆华[1] 曾田 蒋霄 XU Shilang;WU Ping;ZHOU Fei;LI Qinghua;ZENG Tian;JIANG Xiao(Institute of Advanced Engineering Structures and Materials,Zhejing University,Hangzhou 310058,Zhejiang,China)

机构地区：[1]浙江大学高性能建筑结构与材料研究所,浙江杭州310058

出　　处：《爆炸与冲击》2021年第6期65-80,共16页Explosion and Shock Waves

基　　金：国家自然科学基金(51678522,51622811)。

摘　　要：活性粉末混凝土(reactive powder concrete,RPC)具有超高的强度和优异的阻裂性能。为了研究RPC在多次冲击荷载下的损伤规律,采用25 mm口径滑膛炮对直径为600 mm、高600 mm的RPC圆柱形靶体进行了多次侵彻实验,得到了每次侵彻后靶体的破坏数据,并根据实验数据确定了Forrestal经验公式中的相关系数。基于K&C本构模型和现有RPC基本力学性能的实验数据,修正了K&C模型的强度面参数、损伤参数、状态方程参数、损伤演化模型以及应变率效应相关参数,系统地确定了RPC的K&C模型参数。采用LS-DYNA软件中的重启动功能模拟了弹体多次侵彻RPC靶体的破坏结果,模拟结果与实验结果基本一致,验证了模拟方法的有效性。对长2200 mm、宽2200 mm、高1260 mm的RPC靶体抗侵彻实验进行了数值预测,得到了侵彻深度与弹速之间的关系、弹体贯穿靶体时的极限速度以及弹体侵彻过程中的峰值加速度。Reactive powder concrete(RPC)has ultra-high strength and excellent crack resistance.To study the damage law of the RPC subjected to multiple impact loads,a 25 mm caliber smoothbore gun was used to penetrate the RPC cylindrical target with the diameter of 600 mm and the height of 600 mm.In addition,the experimental data of the target after each penetration was obtained,and the correlation coefficient in the Forrestal empirical formula was determined.Based on the K&C constitutive model and the existing experimental data of the RPC,the model parameters for the RPC were determined systematically by modifying the strength and surface parameters,damage parameters,equation-of-state parameters,damage evolution model,the strain rate effect.The restart function in the LS-DYNA software was used to simulate the damage results of the projectile repeatedly penetrating the RPC target.The simulation results are basically consistent with the experimental results,and the effectiveness of the simulation method is verified.Finally,the numerical prediction of the penetration resistance experiment of the RPC target with the length of 2200 mm,the width of 2200 mm,and the height of 1260 mm was carried out.The relationship between the penetration depth and the projectile velocity,the minimum velocity of the projectile passing through the target and the peak acceleration during projectile penetration were obtained.

关 键 词：活性粉末混凝土 K&C本构模型 多次侵彻 重启动 数值预测 

分 类 号：O383[理学—流体力学]