Modified K&C model for cratering and scabbing of concrete slabs under projectile impact
Modified K&C model for cratering and scabbing of concrete slabs under projectile impact
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改良K
DOI：
10.1016/j.ijimpeng.2017.02.016
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发表时间：
2017-10
影响因子：
5.1
通讯作者：
Crawford John E.
中科院分区：
文献类型：
--
作者：
Kong Xiangzhen;Fang Qin;Li Q. M.;Wu Hao;Crawford John E.
K&C材料模型是针对爆炸荷载作用下的结构反应而建立的，对其进行了修正，以提高其对混凝土板在弹丸冲击作用下的缩孔和锈蚀现象的数值预测能力。对强度面参数、拉伸动态增长因子、屈服比例因子与损伤函数的关系、拉伸损伤累积进行了四次修正。通过无侧限单轴压缩、三轴压缩、动态单轴拉伸以及双轴和三轴拉伸试验，验证了改进后的K&C模型的性能。通过自定义材料模型将修正后的混凝土强度模型导入到有限元程序LS-DYNA中。通过与穿孔试验和原K&C模型的模拟结果的比较，验证了修正的K&C模型对弹丸撞击下的弹坑和结疤现象的改进预测。此外，还对控制修正K&C模型动态拉伸行为的五个参数进行了敏感性分析，以了解各个参数对凹坑和结疤现象的影响。
The K&C material model, which was originally developed for the structural response subjected to blast loadings, is modified to improve its numerical prediction capability for cratering and scabbing phenomena in concrete slabs subjected to projectile impact. Four modifications are made for the parameters of the strength surfaces, the dynamic increase factor for tension, the relationship between yield scale factor and damage function, and the tensile damage accumulation. Single element tests of the unconfined uniaxial compression, triaxial compression, dynamic uniaxial tension as well as the biaxial and triaxial tensions are used to demonstrate the improved performances of the modified K&C model. The modified concrete strength model is implemented into the finite element code LS-DYNA through user-defined material model. The improved predictions for cratering and scabbing phenomena under projectile impact using the modified K&C model are demonstrated by comparisons with the perforation tests and the corresponding simulation results from the original K&C model. Furthermore, sensitivity analyses of five parameters that control the dynamic tensile behaviour of the modified K&C model are carried out to understand the influence of each individual parameter on the cratering and scabbing phenomena.
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DOI：
10.2172/6363358
发表时间：
1990-09
期刊：
--
影响因子：
--
作者：
J. Levatin;A. Attia;J. Hallquist
通讯作者：
J. Levatin;A. Attia;J. Hallquist
影响因子：
5.1
作者：
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通讯作者：
J. Weerheijm;J. Doormaal
DOI：
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发表时间：
1998-08
期刊：
--
影响因子：
--
作者：
L. Malvar;J. Crawford
通讯作者：
L. Malvar;J. Crawford
影响因子：
5.1
作者：
HANCHAK, SJ;FORRESTAL, MJ;EHRGOTT, JQ
通讯作者：
EHRGOTT, JQ
DOI：
10.1016/j.ijimpeng.2005.08.003
发表时间：
2006-12-01
影响因子：
5.1
作者：
Gebbeken, N;Greulich, S;Pietzsch, A
通讯作者：
Pietzsch, A