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学者姓名：黄瑞源
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Abstract ：
Underwater explosion tests were performed beneath the clamped square plates using 2.5 g TNT, RDX, and B explosive. The dynamic responses of the plate were investigated under the joint actions of underwater explosive shock wave, bubble pulsation, and water jet load. The results show that: lower energy TNT causes permanent convex deformation integrally on the square plate, whereas higher energy explosives B and RDX cause permanent convex deformations on the middle-upper side and a concave deformation on the plate’s edge. To further investigate the damage characteristics of clamped square plate caused by different explosives, numerical simulation was performed using Abaqus. The results show that: during the process of bubble’s expansion, its internal pressure gradually drops to a lower level than the atmosphere pressure, resulting in a pressure difference and concave deformation of the plate. The steel plate then rebounds as a result of the combined action of bubble pulsation and water jet. Different explosives show different bubble effect during the process of plate rebounding, which is the primary reason for the various damage forms. Increasing the plate thickness effectively prevents the clamped square plate’s middle convex side concave deformation. This work can be employed to design underwater warheads. © 2024 Tsinghua University. All rights reserved.
Keyword ：
ABAQUS ABAQUS Aerodynamics Aerodynamics Underwater cameras Underwater cameras Underwater explosions Underwater explosions Vortex flow Vortex flow
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| GB/T 7714 | Lai, Zhi-Chao , Deng, Shuo , Qin, Jian et al. STUDY ON DYNAMIC RESPONSE OF CLAMPED SQUARE PLATES UNDER NEAR-FIELD UNDERWATER EXPLOSION WITH DIFFERENT EXPLOSIVES [J]. | Engineering Mechanics , 2024 , 41 (11) : 179-194 . |
| MLA | Lai, Zhi-Chao et al. "STUDY ON DYNAMIC RESPONSE OF CLAMPED SQUARE PLATES UNDER NEAR-FIELD UNDERWATER EXPLOSION WITH DIFFERENT EXPLOSIVES" . | Engineering Mechanics 41 . 11 (2024) : 179-194 . |
| APA | Lai, Zhi-Chao , Deng, Shuo , Qin, Jian , Chi, Hui , Meng, Xiang-Yao , Wen, Yan-Bo et al. STUDY ON DYNAMIC RESPONSE OF CLAMPED SQUARE PLATES UNDER NEAR-FIELD UNDERWATER EXPLOSION WITH DIFFERENT EXPLOSIVES . | Engineering Mechanics , 2024 , 41 (11) , 179-194 . |
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该文开展了 2.5gTNT、RDX和B炸药在固支方板底部近距离起爆的水下爆炸试验,研究了固支方板在水下爆炸冲击波、气泡脉动、水射流载荷共同作用下的动态响应.试验结果表明:含能较低的TNT炸药使方板呈现整体上凸式永久变形,含能较高的B炸药和RDX炸药会使方板呈现中部上凸、边部下凹式永久变形.为了进一步探讨不同炸药对固支方板的毁伤特性,通过ABAQUS软件对水下爆炸全过程进行数值模拟,数值模拟结果显示:在气泡膨胀的过程中,气泡内部压力逐渐小于大气压力,固支方板在压力差的作用下向下凹陷,接着在气泡脉动和水射流的联合作用下向上凸起,在不同类型炸药产生的气泡作用下方板凸起过程中动态响应的差异是其呈现不同毁伤形态的根本原因.仿真结果还显示,固支方板的最大等效塑性应变发生在固支边界处;增加板厚可有效防止固支方板发生中凸边凹式变形.该文的工作可为水下战斗部设计提供参考.
Keyword ：
固支方板 固支方板 塑性大变形 塑性大变形 数值模拟 数值模拟 水下爆炸 水下爆炸 高速摄像 高速摄像
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| GB/T 7714 | 赖志超 , 邓硕 , 秦健 et al. 不同类型炸药近场水下爆炸下固支方板动态响应研究 [J]. | 工程力学 , 2024 , 41 (11) : 179-194 . |
| MLA | 赖志超 et al. "不同类型炸药近场水下爆炸下固支方板动态响应研究" . | 工程力学 41 . 11 (2024) : 179-194 . |
| APA | 赖志超 , 邓硕 , 秦健 , 迟卉 , 孟祥尧 , 文彦博 et al. 不同类型炸药近场水下爆炸下固支方板动态响应研究 . | 工程力学 , 2024 , 41 (11) , 179-194 . |
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采用实验与数值模拟相结合的方法，研究了不同长径比的柱形装药在固支方板下爆炸气泡动力学行为；对质量2.5g、长径比分别为1∶1和2∶1的TNT炸药进行了水中固支方板下的爆炸实验，利用高速摄影记录爆炸气泡演化图像；使用ABAQUS软件对长径比为5∶1、10∶1、20∶1的柱形装药，在竖直与水平设置条件下的水下爆炸气泡演化过程进行了数值模拟。结果表明，炸药长径比为1∶1和2∶1时，爆炸气泡演化现象无明显差别。当药柱竖直放置时，由于炸药长径比不同导致的爆炸气泡初始形态差异，会在气泡演化过程中迅速消弭；但长径比与起爆位置都对射流速度有不同程度的影响；当药柱水平放置时，起爆点位置会影响气泡的对称性和水射流形态；药柱端部起爆时，气泡膨胀过程的形态略微不对称，水射流向起爆点方向偏移；炸药长径比越大爆炸水射流在气泡内部越宽，并且水射流的载荷越小；药柱中心起爆时，爆炸气泡产生竖直向上的水射流，不发生偏移。
Keyword ：
固支方板 固支方板 柱形装药 柱形装药 水下爆炸 水下爆炸 水射流 水射流 爆炸力学 爆炸力学 爆炸气泡 爆炸气泡 长径比 长径比
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| GB/T 7714 | 刘元凯 , 秦健 , 迟卉 et al. 不同长径比柱形炸药水下爆炸气泡动力学行为特性 [J]. | 火炸药学报 , 2024 , 47 (01) : 51-63 . |
| MLA | 刘元凯 et al. "不同长径比柱形炸药水下爆炸气泡动力学行为特性" . | 火炸药学报 47 . 01 (2024) : 51-63 . |
| APA | 刘元凯 , 秦健 , 迟卉 , 孟祥尧 , 文彦博 , 黄瑞源 . 不同长径比柱形炸药水下爆炸气泡动力学行为特性 . | 火炸药学报 , 2024 , 47 (01) , 51-63 . |
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目的 不同密度的硬质聚氨酯泡沫（RPUF）适用于不同的工程应用，通过对不同密度RPUF力学性能开展研究，并对现有的本构模型加以修正，得到材料真实的本构关系。方法 通过开展不同密度RPUF材料的准静态压缩实验（0.001s-1）及不同加载速率（100～1000s-1）下的动态压缩力学性能实验，得到材料的应力-应变曲线，在此基础上分析RPUF材料的密度效应及应变率敏感性，得到其真实本构关系。结果 RPUF材料力学性能受到密度和应变率的耦合影响，随着密度以及应变率的增大，RPUF材料的屈服应力呈指数函数形式增大；给出了RPUF材料屈服应力与应变率及密度之间的函数关系式。结论 得到了基于实验数据以及横向惯性效应修正后的Sherwood-Frost模型（M-S-F模型），研究结果可为RPUF材料在抗冲击方面的工程应用提供指导。
Keyword ：
压缩力学性能 压缩力学性能 密度效应 密度效应 应变率效应 应变率效应 本构关系 本构关系 硬质聚氨酯泡沫塑料 硬质聚氨酯泡沫塑料
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| GB/T 7714 | 刘欢 , 黄瑞源 , 马佳佳 et al. 不同密度硬质聚氨酯泡沫的力学性能和本构关系 [J]. | 包装工程 , 2024 , 45 (11) : 282-290 . |
| MLA | 刘欢 et al. "不同密度硬质聚氨酯泡沫的力学性能和本构关系" . | 包装工程 45 . 11 (2024) : 282-290 . |
| APA | 刘欢 , 黄瑞源 , 马佳佳 , 刘元凯 , 柏绍波 , 王成 . 不同密度硬质聚氨酯泡沫的力学性能和本构关系 . | 包装工程 , 2024 , 45 (11) , 282-290 . |
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The cavitation phenomenon caused by near-field underwater explosion imposes a secondary loading on ship structures. Studying the cavitation effects of plates during underwater explosions has implications for ship protection since plate is a typical structure of ships. This paper experimentally investigated the behavior of fixed square plates subjected to near-field underwater explosions. Experimental results indicated that cavitation existed in both shockwave and bubble pulsation stages; and the cavitation closure load at bubble pulsation stage was measured. To further investigate the cavitation phenomenon and the load characteristics at the bubble pulsation stage, finite element models were developed. The numerical results show that cavitation will increase the bubble load impulse by 47 % under specific conditions. These models were then used to investigate the influence of the stand-off distance and charge weight on cavitation area and load characteristics. An empirical formula was finally proposed to predict the coupled impulse of cavitation closure, bubble pulsation and water jet. This research has practical guidelines for the protection design of ship structures.
Keyword ：
Bubble pulsation Bubble pulsation Cavitation Cavitation Impulse Impulse Load Load Underwater explosion Underwater explosion
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| GB/T 7714 | Huang, Ruiyuan , Chen, Yufan , Qin, Jian et al. Investigation on cavitation phenomena and load characteristics of fixed square plates subjected to near-field underwater explosion [J]. | OCEAN ENGINEERING , 2024 , 295 . |
| MLA | Huang, Ruiyuan et al. "Investigation on cavitation phenomena and load characteristics of fixed square plates subjected to near-field underwater explosion" . | OCEAN ENGINEERING 295 (2024) . |
| APA | Huang, Ruiyuan , Chen, Yufan , Qin, Jian , Meng, Xiangyao , Wen, Yanbo , Yang, Xiaoqiang et al. Investigation on cavitation phenomena and load characteristics of fixed square plates subjected to near-field underwater explosion . | OCEAN ENGINEERING , 2024 , 295 . |
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The current research on the cavitation phenomenon in the underwater explosion process is focused on the shock wave phase. In this study, it was found that there was also significant cavitation during bubble pulsation. Underwater explosion experiments were carried out at the bottom of a sheet using 2.5 g of TNT, which also showed that: (a) Cavitation lasts for the same duration as the bubble contraction time, (b) A cavitation closure pressure, the peak of which is greater than the bubble pulsation pressure, is produced by the closing of the cavitation zone. A tensile cut-off model was introduced to simulate the cavitation phenomenon during bubble pulsation, and the formation mechanism was investigated. The numerical simulation results show that: (a) The cavitation phenomenon is visible when the sheet above the explosive and the explosion distance are between 0.93 and 1.17 times the radius of the largest bubble, or between 0.69 and 1.85 times the maximum radius of the bubble when the sheet below the explosive, (b) The cavitation region and cavitation closure pressure increase and decrease with increasing explosion distance, peaking at a value close to one times the theoretical maximum bubble radius, and (c) The cavitation zone shrinks and the cavitation closing pressure drops as sheet thickness increases.
Keyword ：
Bubble pulsation Bubble pulsation Cavitation Cavitation Near-field Near-field Underwater explosion Underwater explosion
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| GB/T 7714 | Wen, Yanbo , Qin, Jian , Lai, Zhichao et al. Experimental and numerical simulation investigation of cavitation phenomenon during bubble pulsation process [J]. | INTERNATIONAL JOURNAL OF IMPACT ENGINEERING , 2024 , 186 . |
| MLA | Wen, Yanbo et al. "Experimental and numerical simulation investigation of cavitation phenomenon during bubble pulsation process" . | INTERNATIONAL JOURNAL OF IMPACT ENGINEERING 186 (2024) . |
| APA | Wen, Yanbo , Qin, Jian , Lai, Zhichao , Meng, Xiangyao , Yang, Xiaoqiang , Chi, Hui et al. Experimental and numerical simulation investigation of cavitation phenomenon during bubble pulsation process . | INTERNATIONAL JOURNAL OF IMPACT ENGINEERING , 2024 , 186 . |
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Repeated loading and unloading tests were carried out on concrete under different confining pressures and strain rates to characterize the damage using the decrease in elastic modulus, and a damage evolution equation considering the effects of confining pressure and strain rate was established. At the same time, the yield criterion and equation of state of the Holmquist-Johnson-Cook (HJC) model were modified by combining the experimental data of high confining pressure. The modified model was validated by performing single -element numerical simulations for different stress states. Then, experiments were carried out on the penetration of tungsten alloy projectiles into concrete slabs, with penetration velocities ranging from 172 m/s to 302 m/s. The depth of penetration and crater area were obtained. Numerical simulations were subsequently carried out using the proposed model. The results showed that this model can describe the behaviour of concrete under dynamic loading. Finally, the damage evolution mechanism of concrete during the penetration process is analysed in conjunction with the proposed damage evolution equation.
Keyword ：
Concrete Concrete Constitutive model Constitutive model Mechanical properties Mechanical properties Numerical simulation Numerical simulation Projectile Projectile
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| GB/T 7714 | Huang, Ruiyuan , Wen, Yanbo , Li, Yi et al. Application of concrete damage evolution equation considering confining pressure and strain rate effects in projectile penetration [J]. | ENGINEERING FAILURE ANALYSIS , 2024 , 158 . |
| MLA | Huang, Ruiyuan et al. "Application of concrete damage evolution equation considering confining pressure and strain rate effects in projectile penetration" . | ENGINEERING FAILURE ANALYSIS 158 (2024) . |
| APA | Huang, Ruiyuan , Wen, Yanbo , Li, Yi , Zhou, Hao , Yang, Xiaoqiang , Qin, Jian et al. Application of concrete damage evolution equation considering confining pressure and strain rate effects in projectile penetration . | ENGINEERING FAILURE ANALYSIS , 2024 , 158 . |
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Using the method combining experiments and numerical simulations, the dynamic behavior of explosion bubbles for the cylindrical charges with different length-diameter ratios (L/D) under fixed square plates was studied. Explosion tests of TNT explosives with the mass of 2.5g and L/D of 1:1 and 2:1 under a fixed square plate was carried out, and the evolution of explosive bubbles was recorded by the high-speed camera. ABAQUS software was used to numerically simulate the underwater explosion bubble evolution process of cylindrical charges with L/D of 5:1, 10:1, and 20:1 under vertical and horizontal settings. The results show that there is no obvious difference between the explosion of 2.5g TNT explosives with a L/D of 1:1 and 2:1 under the board. When the explosives are placed vertically, the difference in the initial shape of the explosion bubble caused by different L/D of the explosives will be quickly eliminated during the evolution of the bubble. Moreover, the L/D and the starting position have effects on the water jet. When the explosives are placed horizontally, the symmetry of the bubble and the shape of the water jet will be affected by the location of the initiation point. To be specific, for the detonation from the end face, there is a slight asymmetry in the process of the bubble expansion, and the jet is offset in the direction of the starting point. Moreover, the larger the L/D of the explosives, the wider the water jet in the explosion bubble, and the smaller the load of the water jet. For the detonation from the center, the explosive bubble forms a vertical water jet without offset. © 2024 China Ordnance Industry Corporation. All rights reserved.
Keyword ：
ABAQUS ABAQUS Detonation Detonation High speed cameras High speed cameras Jets Jets Numerical methods Numerical methods Underwater explosions Underwater explosions
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| GB/T 7714 | Liu, Yuan-Kai , Qin, Jian , Chi, Hui et al. Dynamic Behavior Characteristics of Underwater Explosion Bubbles with Different Length-diameter Ratios [J]. | Chinese Journal of Explosives and Propellants , 2024 , 47 (1) : 51-63 . |
| MLA | Liu, Yuan-Kai et al. "Dynamic Behavior Characteristics of Underwater Explosion Bubbles with Different Length-diameter Ratios" . | Chinese Journal of Explosives and Propellants 47 . 1 (2024) : 51-63 . |
| APA | Liu, Yuan-Kai , Qin, Jian , Chi, Hui , Meng, Xiang-Yao , Wen, Yan-Bo , Huang, Rui-Yuan . Dynamic Behavior Characteristics of Underwater Explosion Bubbles with Different Length-diameter Ratios . | Chinese Journal of Explosives and Propellants , 2024 , 47 (1) , 51-63 . |
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Concrete is a strain rate sensitive material, which is widely used in protective structures, and its strain rate effect needs to be considered. This study aims to obtain the real strain rate effect of concrete material. Firstly, the dynamic compression test of concrete was carried out by using split Hopkinson pressure bar (SHPB). The classical Holmquist-Johnson-Cook (HJC) model of concrete is modified based on the test results and the test data of the static performance of concrete. Then the finite element model is established. The numerical simulation results and theoretical analysis show that the inertia effect leads to the error between the test value and the simulation value. To eliminate the influence of inertia effect, this study embeds the inertia effect term into the constitutive model for secondary modification. According to the results of numerical analysis, the specific form of this term and its related parameters are determined. The modified constitutive model can better predict the test results and reproduce the damage morphology of concrete under impact load.
Keyword ：
Concrete Concrete Constitutive model Constitutive model Inertia effect Inertia effect SHPB SHPB Strain rate Strain rate
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| GB/T 7714 | Huang, Ruiyuan , Guan, Zhenhuang , Qin, Jian et al. Strain rate effect of concrete based on split Hopkinson pressure bar (SHPB) test [J]. | JOURNAL OF BUILDING ENGINEERING , 2024 , 86 . |
| MLA | Huang, Ruiyuan et al. "Strain rate effect of concrete based on split Hopkinson pressure bar (SHPB) test" . | JOURNAL OF BUILDING ENGINEERING 86 (2024) . |
| APA | Huang, Ruiyuan , Guan, Zhenhuang , Qin, Jian , Wen, Yanbo , Lai, Zhichao . Strain rate effect of concrete based on split Hopkinson pressure bar (SHPB) test . | JOURNAL OF BUILDING ENGINEERING , 2024 , 86 . |
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Near-field underwater explosions generate complex load forms and cause destructive strikes on ships. To investigate the damage characteristics of ships under the combined effect of multiple loads, local and overall damage modes were first investigated through the combination of experimental tests and numerical simulation. Then a series of numerical simulations of full-scale ships subjected to near-field underwater explosions with different stand-off distances, equivalents, and detonation positions were carried out. The damage effects of shock wave, bubble pulsation, after flow, and water jet loads on ships were analyzed. The results show that the combined effects of different loads lead to different damage modes. Shock waves and after flow loads are the main cause of local damage and hogging damage, while pressure difference and bubble adsorption are the main reasons for the hogging damage. Finally, a criterion was proposed to determine the damage modes of ships under near-field underwater explosions.
Keyword ：
CEL method CEL method Full-size ships Full-size ships Near-field underwater explosion Near-field underwater explosion Numerical simulation Numerical simulation Ship damage modes Ship damage modes
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| GB/T 7714 | Huang, Ruiyuan , Jiang, Yipeng , Qin, Jian et al. Investigation on the coupling damage effects of ships subjected to near-field underwater explosion loads [J]. | MARINE STRUCTURES , 2024 , 98 . |
| MLA | Huang, Ruiyuan et al. "Investigation on the coupling damage effects of ships subjected to near-field underwater explosion loads" . | MARINE STRUCTURES 98 (2024) . |
| APA | Huang, Ruiyuan , Jiang, Yipeng , Qin, Jian , Meng, Xiangyao , Chi, Hui , Yang, Xiaoqiang et al. Investigation on the coupling damage effects of ships subjected to near-field underwater explosion loads . | MARINE STRUCTURES , 2024 , 98 . |
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