Experiments on Cumulative Damage to Hull Girders Subjected to Multiple Underwater Explosions
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摘要: 针对船体梁累积毁伤问题, 开展了多次水下爆炸对船体梁的累积毁伤试验, 考察了爆炸距离、爆炸次数等参数对累积毁伤的影响规律, 基于船体梁挠跨比建立了毁伤等级模型。结果表明: 在中远场水下爆炸加载作用下, 船体梁不发生塑性变形; 在近场作用下, 船体梁会产生中部凹陷的局部塑性变形和整体中拱塑性弯曲变形; 随着爆炸距离的减小, 船体梁整体挠度值增大; 在相同工况下船体梁的累积挠度值与爆炸加载次数近似呈线性关系。Abstract: For the cumulative damage analysis of hull girders, cumulative damage tests on hull girders subjected to multiple underwater explosions were conducted and the factors affecting cumulative damage were considered, including explosion distance, explosion time, and other parameters. A damage level model for hull girders was established based on the ratio of deflection to the half-length of a hull girder. The results demonstrate that a hull girder does not undergo plastic deformation under the action of medium- and far-field underwater explosion loading. Under the action of near-field explosion loading, a hull girder produces two deformation modes: local plastic deformation of the middle depression and overall plastic bending deformation of the middle arch. With a decrease in the explosion distance, the overall deflection of the hull girder increases. Under the same conditions, the cumulative deflection of a hull girder is approximately linearly correlated with the cumulative loading time of an explosion.
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Key words:
- multiple underwater explosions /
- hull girder /
- cumulative damage /
- damage level
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表 1 2种型号船体梁的尺寸规格
Table 1. Dimensions of two types of hull girder
型号 材料 长
/mm宽/mm 高/mm 板厚/mm 横板
数量1 45# 500 65.0 33 1.0 6 2 45# 750 97.5 50 1.5 6 表 2 试验工况
Table 2. Test conditions
型号 W/g H/mm Q/(g1/3·m−1) n 1 2.95 300 4.8 1 2.96 200 7.2 1 3.00 100 14.4 1 3.00 100 14.4 5 2 3.00 100 14.4 5 表 3 水中冲击波参数
Table 3. Parameters of shock wave in water
W/g D/m Pm/MPa T/ms 3 0.49 14.506 0.306 3 0.54 12.918 0.339 3 0.71 9.504 0.449 3 0.76 8.844 0.485 表 4 船体梁毁伤等级程度划分
Table 4. Classification of damage degree of hull girder
等级 挠跨比 局部变形 整体毁伤程度 Ⅰ 0~0.09 底板塑性变形呈类球冠形 轻度毁伤 Ⅱ 0.09~0.20 明显的塑性锥顶平台 中度毁伤 Ⅲ 0.20~0.30 中部舱段形成塑性铰 重度毁伤 Ⅳ >0.30 边界发生皱褶屈曲 严重毁伤 表 5 船体梁变形测量值
Table 5. Measured values of hull girder deformation
型号 n L/mm α/rad d1/mm d2/mm d3/mm d4/mm d5/mm Δ/mm 1 1 750 0.066 5.7 10.4 15.6 19.7 33.6 13.9 2 750 0.162 11.9 24.3 38.5 48.3 70.4 22.1 3 750 0.233 17.8 35.2 54.7 69.4 97.4 28.0 4 750 0.350 25.1 51.4 80.0 102.9 138.6 35.7 5 750 0.450 32.4 64.5 101.3 130.6 175.1 44.5 2 1 1 000 0.058 5.5 11.5 17.5 23.1 40.8 17.7 2 1 000 0.121 11.8 23.4 36.3 48.1 73.6 25.5 3 1 000 0.178 17.1 35.3 53.7 70.9 102.6 31.7 4 1 000 0.251 24.2 48.9 72.1 99.4 137.3 37.9 5 1 000 0.294 28.2 57.6 87.1 116.2 156.2 40.0 -
[1] 吴有生, 彭兴宁, 赵本立. 爆炸载荷作用下舰船板架的变形与破损[J]. 中国造船, 1995, 36(4): 55-61.Wu You-sheng, Peng Xing-ning, Zhao Ben-li. Plastic Deformation and Damage of Naval Panels Subjected to Explosion Loading[J]. Shipbuilding of China, 1995, 36(4): 55-61. [2] Zamyshlyaev B V, Yakovlev Y S. Dynamic Loads in Underwater Explosion: AD757183[R]. Washington D C: Naval Intelligence Support Center, 1973. [3] 杨文山. 水下接触爆炸舰船局部毁伤及防护机理[D]. 哈尔滨: 哈尔滨工程大学, 2011. [4] 张斐, 张春辉, 张磊, 等. 多次水下爆炸作用下钢板动态响应数值模拟[J]. 中国舰船研究, 2019, 14(6): 122-129.Zhang Fei, Zhang Chun-hui, Zhang Lei, et al. Numerical Simulation of Dynamic Response of Steel Plate Subjected to Multiple Underwater Explosions[J]. Chinese Journal of Ship Research, 2019, 14(6): 122-129. [5] 李海涛, 朱石坚, 刁爱民, 等. 水下爆炸作用下对称结构船体梁整体损伤特性研究[J]. 船舶力学, 2017, 8(8): 983-910. doi: 10.3969/j.issn.1007-7294.2017.08.007Li Hai-tao, Zhu Shi-jian, Diao Ai-min, et al. Experimental Investigation on the Damage Modes of Axisymmetrical Ship-like Beam Subjected to Underwater Explosions in Near-Field[J]. Journal of Ship Mechanics, 2017, 8(8): 983-910. doi: 10.3969/j.issn.1007-7294.2017.08.007 [6] Shin H, Seo B, Cho S R. Experimental Investigation of Slamming Impact Acted on Flat Bottom Bodies and Cumulative Damage[J]. International Journal of Naval Architecture & Ocean Engineering, 2017, 10(3): 294-306. [7] Xu H, Guedes S. Experimental Study on the Dynamic Behavior of Beams under Repeated Impacts[J]. International Journal of Impact Engineering, 2020, 147: 103724. [8] Zhou Y, Chong J, Yuan L, et al. Experimental Studies on the Deformation and Damage of Steel Cylindrical Shells Subjected to Double-Explosion Loadings[J]. Thin-Walled Structures, 2018, 127: 469-482. doi: 10.1016/j.tws.2018.02.019 [9] Yuen S C K, Butler A, Bornstein H, et al. The Influence of Orientation of Blast Loading on Quadrangular Plates[J]. Thin-Walled Structures, 2018, 131(10): 827-837. [10] Shamami Z M, Babaei H, Mostofi T M, et al. Structural Response of Monolithic and Multi-Layered Circular Metallic Plates under Repeated Uniformly Distributed Impulsive Loading: An Experimental Study[J]. Thin-Walled Structures, 2020, 157(10): 107024. [11] Cheng L, Ji C, Gao F, et al. Deformation and Damage of Liquid-filled Cylindrical Shell Composite Structures Subjected to Repeated Explosion Loads: Experimental and Numerical Study[J]. Composite Structures, 2019, 220(7): 386-401.