Prediction model of crater damage effect of steel fiber reinforced concrete target under contact explosion of cylinder charge
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摘要: 为评估柱形装药接触爆炸对钢纤维钢筋混凝土(steel fiber reinforced concrete, SFRC)结构的成坑效应,采用光滑粒子伽辽金与结构化任意拉格朗日-欧拉流固耦合算法建立了SFRC靶体数值模型,研究了不同装药量Q和长径比l/d联合作用下SFRC靶体的破坏模式和损伤程度,基于接触爆炸理论与量纲分析,引入爆坑系数K1与 K2构建了爆坑直径D与深度H随有效装药量Qe变化的预测模型。结果表明:不同装药量和长径比联合作用下,SFRC靶体主要呈爆炸成坑破坏。不同装药量情况下,当l/d由1增大至5时,爆坑直径D与深度H均减小了约50%。在Qe小于16 kg范围内,K1与$ \sqrt{{K}_{2}} $随有效装药量呈幂函数衰减,而D与H则随有效装药量呈幂函数增长。在相同Qe条件下,成坑效应更集中于爆坑直径的扩展。构建的预测模型可对不同强度等级与有效装药量下SFRC的爆坑尺寸进行快速且较为准确的计算,为SFRC结构的抗爆设计提供理论依据。Abstract: To evaluate the crater damage effect of cylinder charge contact explosion on steel fiber reinforced concrete (SFRC) structures, a numerical model of an SFRC target was developed by the using the smooth particle Galerkin method and a structured arbitrary Lagrange-Euler (SPG-S-ALE) fluid-structure interaction algorithm. The failure modes and damage of the SFRC target under different charge mass Q and length-to-diameter ratios l/d were investigated. Based on contact explosion theory and dimensional analysis, cratering coefficients K1 and K2 were introduced to develop predictive models for the crater diameter D and depth H as functions of the effective charge mass Qₑ. The results indicate that under the combined effects of charge mass and length-to-to-diameter ratio, the primary failure mode of the SFRC targets is cratering damage. Under constant charge mass conditions, as the l/d ratio increases from 1 to 5, both the crater diameter D and depth H decrease by approximately 50%. Within the range of effective charge Qₑ less than 16 kg, the K1 and$ \sqrt{{K}_{2}} $ exhibit a power-law decay with increasing effective charge mass, while the crater diameter D and depth H show a power-law growth. For a given effective charge mass Qₑ, the cratering effect is more concentrated on the expansion of the crater diameter. The developed predictive model allows for rapid and reasonably accurate calculation of crater dimensions in SFRC with different strength grades and effective charge mass, providing a theoretical basis for the blast-resistant design of SFRC structures.
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Key words:
- steel fiber reinforced concrete /
- cylinder charge /
- contact explosion /
- crater diameter /
- crater depth
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ρ/(kg·m−3) fc/MPa v ft/MPa RSIZE UFC a0 a0y a0f 2440 65 0.24 4.95 39.37 1.45×10−4 −6.5×107 1.703×107 0 a1 a1y a1f a2 a2y a2f b1 b2 b3 0.481 0.726 0.476 1.57×10−9 4.77×10−9 2.31×10−9 0.75 0.2 0.018 注:ρ为密度;fc为抗压强度,ft为抗拉强度,v为泊松比,RSIZE为长度单位转换因子,UFC为应力单位转换因子,a0、a0y、a0f、a1、a1y、a1f、a2、a2y、a2f为强度面参数,b1、b2、b3为损伤参数。 材料 ρ/(kg·m−3) E/GPa v σy/MPa HRB400钢筋 7 850 205 0.29 400 Q235钢板 7 850 210 0.3 310 注:E为弹性模量,σy为屈服强度。 ρ/(kg·m−3) C0 C1 C2 C3 C4 C5 C6 E0/(GJ·m−3) V0 1.29 0 0 0 0 0.4 0 0 250 1 注:C0~C6为状态方程系数,E0为初始内能,V0为初始相对体积。 ρ/(kg·m−3) D1/(m·s−1) p/GPa A/GPa B/MPa R1 R2 ω E0/(GJ·m−3) 1 630 6 930 21 373 3 747 4.15 0.9 0.35 7 注:A、B、R1、R2、ω为炸药参数,E0为初始内能,p为爆轰压力,D1为爆速。 表 5 SFRC靶K&C模型参数
Table 5. Parameters of K&C model for SFRC target
ρ/(kg·m−3) fc/MPa v ft/MPa RSIZE UFC a0 a0y a0f 2440 107 0.24 9.3 39.37 1.45×10−4 −1.07×108 3.17×107 0 a1 a1y a1f a2 a2y a2f b1 b2 b3 0.533 0.827 0.527 7.34×10−10 2.23×10−9 1.08×10−9 1.6 −2 1.15 表 6 不同装药量与长径比作用下SFRC靶体破坏形态
Table 6. Failure modes of SFRC targets under varying Q and l/d
l/d SFRC靶体破坏形态 Q =1 kg Q =3 kg Q =5 kg Q =7 kg Q =9 kg Q =11 kg 1 





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