Calibration of Holmquist Johnson Cook (HJC) model for projectile penetration of geopolymer-based ultra-high performance concrete (G-UHPC)
Calibration of Holmquist Johnson Cook (HJC) model for projectile penetration of geopolymer-based ultra-high performance concrete (G-UHPC)
复制标题
地聚合物基超高性能混凝土 (G-UHPC) 射弹侵彻 Holmquist Johnson Cook (HJC) 模型的校准
DOI：
10.1016/j.istruc.2022.06.034
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发表时间：
2022-09
期刊：
影响因子：
4.1
通讯作者：
Chengqing Wu
中科院分区：
文献类型：
--
作者：
Jian Liu;Cheng Liu;Kefo Qu;Jun Li;Chengqing Wu
Holmquist约翰逊-库克（HJC）模型被广泛用于模拟弹丸对混凝土靶的侵彻。基于单轴压缩、三轴压缩、分离式霍普金森压杆（SHPB）和Hugoniot试验数据，对一种新型超高性能混凝土--地聚合物基超高性能混凝土（G-UHPC）的强度面、应变率效应、损伤演化和状态方程等HJC模型参数进行了系统标定。采用修正后的HJC模型，在LS-DYNA有限元程序中对弹丸侵彻普通和纤维增强G-UHPC靶板的过程进行了数值模拟。穿透深度（DOP）的数值结果与试验数据显示出相当的一致性。通过与半解析模型的比较，验证了数值计算结果的正确性。这些观测结果表明，校准的HJC模型的适用性和有效性，估计的DOP的G-UHPC目标受到弹丸的影响。利用校准和验证的HJC模型，进一步进行参数研究，以探索G-UHPC的单轴抗压强度、弹丸撞击速度、质量、直径和头部形状对最终DOP值的影响。基于参数研究的数值结果，提出了一个关于上述变量的经验公式，这可以帮助设计G-UHPC防护屏障，防止弹丸侵彻。
Holmquist Johnson Cook (HJC) model has been extensively adopted to simulate the projectile penetration of concrete targets. In this study, based on the available experimental data of uniaxial compression, triaxial compression, split Hopkinson pressure bar (SHPB) and Hugoniot tests, HJC model parameters in terms of the strength surface, strain rate effect, damage evolution and equation of state (EOS) were systematically calibrated for a newly fabricated ultra-high performance concrete termed as geopolymer-based ultra-high performance concrete (G-UHPC). Using the HJC model with calibrated model parameters, numerical simulations of projectile penetration into plain and fibre reinforced G-UHPC targets were performed in a commercial finite element program LS-DYNA. The numerical results for the depth of penetration (DOP) exhibited fair agreement with the test data. The numerical projectile velocity and displacement evolutions were also validated through comparing to the semi-analytical model. These observations demonstrated the applicability and validity of the calibrated HJC model to estimate DOP of G-UHPC targets subjected to projectile impact. With the calibrated and validated HJC model, parametric studies were further conducted to explore the effect of uniaxial compressive strength of G-UHPC, projectile impact velocity, mass, diameter and nose shape on the final DOP values. Based on the numerical results from the parametric studies, an empirical equation concerning the aforementioned variables was proposed, which could help design G-UHPC protective barriers against projectile penetration.