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学者姓名：黄瑞源
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Abstract ：
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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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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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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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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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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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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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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In Split Hopkinson Pressure Bar (SHPB) tests, the size effect is a significant factor influencing the dynamic mechanical properties of concrete-like materials. To investigate the impact of size effect on concrete strength, this study conducted dynamic compression tests on concrete specimens of different sizes using a Phi 74 mm SHPB test device. The results indicated that concrete material exhibited a significant strain rate effect and size effect. Based on test results, the Holmquist-Johnson-Cook (HJC) model considering the strain rate effect was used for numerical analysis, with improvement made to the strain rate effect term. Different-sized numerical simulation models were established using Abaqus software, and parameterized analysis of specimen sizes was conducted based on theory and simulation results to determine the optimal specimen size. Based on the analysis results and considering the synergistic effect of strain rate effect and size effect, a size-modified coefficient was introduced into the constitutive model to establish a calculation model for the size effect of dynamic compression in concrete. The model considering the size effect could effectively predict test results.
Keyword ：
Concrete Concrete Constitutive model Constitutive model Inertia effect Inertia effect SHPB SHPB Size effect Size effect
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| GB/T 7714 | Guan, Zhenhuang , Li, Yi , Lai, Zhichao et al. Size effect of concrete based on split Hopkinson pressure bar (SHPB) test [J]. | CONSTRUCTION AND BUILDING MATERIALS , 2024 , 441 . |
| MLA | Guan, Zhenhuang et al. "Size effect of concrete based on split Hopkinson pressure bar (SHPB) test" . | CONSTRUCTION AND BUILDING MATERIALS 441 (2024) . |
| APA | Guan, Zhenhuang , Li, Yi , Lai, Zhichao , Zhou, Hao , Qin, Jian , Wen, Yanbo et al. Size effect of concrete based on split Hopkinson pressure bar (SHPB) test . | CONSTRUCTION AND BUILDING MATERIALS , 2024 , 441 . |
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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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With the advancement of weapon systems, high-strength concrete (HSC) has been extensively utilized in protective engineering. To investigate the damage characteristics of HSC under impact resistance, this study first conducted Split Hopkinson Pressure Bar (SHPB) tests on HSC, along with cyclic loading and unloading tests. Based on the test data of SHPB and cyclic loading and unloading, the original Holmquist-Johnson-Cook (HJC) model was adjusted accordingly. Additionally, tungsten alloy bullet penetration tests on concrete plates with different initial velocities were performed to measure the depth of penetration (DOP) and crater area corresponding to each velocity. A numerical model was then established using Abaqus software. The test results and numerical simulations were compared and analyzed, demonstrating that the predicted results closely matched the test, with a DOP error margin of less than 10 %. This confirmed the feasibility and accuracy of the modified model and its parameters. Finally, the results of numerical simulation were used to analyze the mechanical properties of HSC during impact resistance.
Keyword ：
Constitutive model Constitutive model High-strength concrete High-strength concrete Numerical simulation Numerical simulation Projectile penetration Projectile penetration
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| GB/T 7714 | Guan, Zhenhuang , Lai, Zhichao , Qin, Jian et al. Mechanical properties of high-strength concrete (HSC) under projectile penetration [J]. | CONSTRUCTION AND BUILDING MATERIALS , 2024 , 442 . |
| MLA | Guan, Zhenhuang et al. "Mechanical properties of high-strength concrete (HSC) under projectile penetration" . | CONSTRUCTION AND BUILDING MATERIALS 442 (2024) . |
| APA | Guan, Zhenhuang , Lai, Zhichao , Qin, Jian , Chen, Yufan , Wen, Yanbo , Huang, Ruiyuan . Mechanical properties of high-strength concrete (HSC) under projectile penetration . | CONSTRUCTION AND BUILDING MATERIALS , 2024 , 442 . |
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