Experimental Investigation on the Concrete Damage Behaviorunder the Shaped-Charge Loading
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摘要: 聚能装药侵彻混凝土靶板的研究主要集中在聚能装药的材料、结构、侵彻深度和侵彻孔径大小方面，少有涉及整个混凝土靶板的破坏行为, 但混凝土靶的整体破坏行为对整个聚能装药的侵彻毁伤效能评估有至关重要的作用。为更好地判定聚能装药对混凝土靶体的破坏程度，开展了大口径聚能装药侵彻大尺寸混凝土靶的实验研究。对实验后的混凝土靶板进行剖切，从混凝土靶的内部剖切面观测不同位置处混凝土靶的损伤程度，并对各个位置处的孔洞直径进行测量，获取孔洞的完整尺寸。在过孔洞中心的同一截面上切割边长为10cm的标准混凝土试件，并对其进行抗压强度测试，根据测试结果评估混凝土靶板的整体破坏行为，进而得到混凝土靶在聚能装药载荷下的破坏行为。测试结果表明，混凝土靶板的背板拉伸破坏半径约为110cm；以孔洞中心为轴，半径小于100cm内的混凝土损伤较严重，边界块体强度约为原始强度的40%；半径在100~140cm范围内混凝土的损伤不大，混凝土试件的强度约为原始强度的72%；当半径大于140cm后，聚能装药对混凝土的影响较弱，混凝土几乎未出现损伤。Abstract: The research of shaped-charge penetrating concrete target focuses on the material and the structure of the shaped-charge, penetration depth and penetration aperture size, but seldom involves the destruction of a concrete target board.However, the determination of whose overall damage behavior plays a significant role in the penetration effectiveness evaluation of the shaped-charge on the concrete.In the present work, to make up for this defect, we carried out experiments of the heavy-caliber shaped-charges penetrating a large-size concrete target.After the experiment, we cut the concrete target to assess its damage under the shaped-charge loading.We evaluated the concrete target damage at different locations from inside the target and measured the hole diameters at different locations.Cube concrete specimens with a side length of 10cm were also obtained in the same damaged section across the hole center.The strength test results show that the reflective stretching damage radius is about 110cm; the concrete damage is severe within a 100cm radius, and the compressive strength of the concrete specimen at the border within this radius range is about 30MPa, which is about 40% of the original compressive strength; the compressive strengths of the concrete specimens within the scope of the radius 100-140cm are similar and are all around 46MPa, which is about 72% of the original compressive strength; when the radius is larger than 140 cm, the concrete damage is negligible.
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Key words:
- shaped-charge penetration /
- concrete /
- strength test /
- explosion and impact
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图 4 压缩破坏前、后的混凝土材料试件
Figure 4. Concrete material specimens before and after compressed damage
图 8 混凝土试件取样分布图及部分试件
Figure 8. Concrete specimen sampling distribution and the polished concrete specimen
表 1 炸药的材料参数
Table 1. Material parameters of the explosive composition B
Density/(g/cm3) Detonation velocity/(m/s) C-J pressure/(GPa) Initialinternal energy/(J/g) 1.67 7980 29.5 0.085 
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表 2 药型罩的材料参数
Table 2. Material parameters of the linear
Density/(g/cm3) Elasticmodulus/(GPa) Yieldstrength/(MPa) Possion'sratio 7.806 210 275 0.3
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表 3 混凝土材料强度测试结果
Table 3. Concrete material strength test results
Test No. Compressive strength/(MPa) 1# 69.4 2# 70.3 3# 68.6
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表 4 强度测试结果
Table 4. Comprehensive strength test results
Group H/(cm) Concretespecimen label Compressivestrength/(MPa) T-1 15 B-31 21.2 B-32 37.1 C-41 46.6 C-42 53.4 T-2 55 B-11 36.5 B-12 44.1 C-31 46.1 C-32 55.1 C-33 57.7 T-3 105 B-21 40.9 B-22 49.0 C-21 59.3 T-4 155 C-01 46.8 C-11 59.3 C-12 66.8 T-5 195 B-01 26.5 B-02 31.8 B-03 53.7 C-51 68.4 C-52 71.5
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