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| 1 | Fuzzy interface treatment in Eulerian method显示文摘In this paper, we incorporate fuzzy mathematics approach into the Eulerian method to simulate three dimensional multi-material interfaces. In particular, we propose a fuzzy interface treatment for describing interfaces, designing transport plans, and computing transport quantities. Using a set of three-dimensional inviscid isothermal elastic-plastic hydrodynamic equations, we simulate shaped charge jet in different filled dynamite structures. Strain and stress have been under consideration in simulations. Numerical results demonstrate that the fuzzy interface treatment is correct and efficient for three-dimensional multi-material problems. | NING Jianguo1 & CHEN Longwei1,2 1. National Key Laboratory of Protection and Control of Explosive Disaster, Beijing Institute of Technology, Beijing 100081, China 2. The Faculty of Land Resource Engineering, Kunming University of Science and Technology, Kunming 650093, China Correspondence should be addressed to Ning Jianguo | 2004 | Science China(Technological Sciences)2004，47，5： | 40 |
| 2 | Mechanical mechanism of overlying strata breaking and development of fractured zone during close-distance coal seam group mining显示文摘This study mainly investigates the mechanical mechanism of overlying strata breaking and the development of fractured zones during close-distance coal seam group mining in the Gaojialiang coal mine.First,a mechanical model for the second'activation'of broken overlying strata is established,and the related mechanical'activation'conditions are obtained.A recursive formula for calculating the separation distance of overlying strata is deduced.Second,a height determining method for predicting the height of fractured zones during close-distance coal seam group mining is proposed based on two values,namely,the separation distance and ultimate subsidence value of overlying strata.This method is applied to calculate the fractured zone heights in nos.20107 and 20307 mining faces.The calculated results are almost equal to the field observation results.Third,a modified formula for calculating the height of a waterflowing fractured zone is proposed.A comparison of the calculated and observed results shows that the errors are small.The height determining method and modified formula not only build a theoretical foundation for water conservation mining at the Gaojialiang coal mine,but also provide a reference for estimating the height of water-flowing fractured zones in other coal mines with similar conditions. | Jianguo Ning Jun Wang Yunliang Tan Qiang Xu | 2020 | International Journal of Mining Science and Technology2020，30，2： | 19 |
| 3 | Experimental investigation of penetration performance of shaped charge into concrete targets显示文摘为了开发一个双人脚踏车弹头,那能有效地破坏具体目标,这篇论文借助于实验与不同的锥角度和班机材料探索塑造的费用的穿入表演进具体目标。穿入过程和由塑造的费用和动能射弹的具体目标的破坏机制被分析并且比较。试验性的结果建议运动精力充沛的射弹和塑造的充电能够破坏损坏的具体目标,而是大小是不同的。与动能射弹相比,塑造的费用有穿入的更多的重要效果进目标,并且引起很大的 spalling 区域。因此,塑造的费用对双人脚踏车弹头的第一阶段的充电相当合适。当洞直径变得更大时,随塑造的费用班机锥角度的增加,穿入的深度逐渐地减少,这也被发现。有铜班机的穿入深度比铝班机大,但是洞直径相对更小,并且有钢班机的塑造的起诉在上述二诉讼之间。有 100 °的一个锥角度的塑造的费用能形成喷气射弹费用(JPC ) 。与 JPC,有具体目标上的最佳深度和直径的一个洞能被形成,它保证秒阶段弹头顺利渗透进洞并且在最佳深度爆炸在具体目标完成破坏的需要的水平。 | Cheng Wang Tianbao Ma Jianguo Ning | 2008 | Acta Mechanica Sinica2008，24，3： | 12 |
| 4 | Dynamic mechanical behavior and the constitutive model of concrete subjected to impact loadings显示文摘Based on the theory of consecutive damage mechanics, micro-mechanics, statis-tics and the visco-plastic constitutive equation of Perzyna, a coupled model of damage and plasticity is developed to describe the complex behavior of concrete subjected to impact loadings. In this model, some suppositions about deformation of the material and evolution of the damage are made. First, concrete is macro-scopically assumed to be homogeneous and consecutive, while it is microscopi-cally filled with large amounts of micro-crack and micro-void defects. Second, the damage evolution of the micro-cracks is caused by the nucleation, growth and coalescence of the micro-cracks due to the interior tensile stress in concrete, which leads to a degradation in the strength and stiffness of concrete. Third, compaction of concrete is physically a collapse of the material micro-void. It pro-duces irreversible plastic strains in the material and, at the same time, an increase in the bulk modulus. Fourth, there is no interaction between the micro-crack and the micro-void. Last, when the damage reaches a critical value, the concrete may fail totally. The model parameters for concrete are determined by plate impact ex-periments. The model predictions fit the experimental results well. So the model can be used to simulate the dynamic mechanical behavior of concrete under impact loadings. | NING JianGuo LIU HaiFeng SHANG Lin | 2008 | Science China(Physics,Mechanics & Astronomy)2008，51，11： | 12 |
| 5 | Influence of desert sand on the mechanical properties of concrete subjected to impact loading显示文摘A74-mm-diameter Split Hopkinson pressure bar was used to carry out the dynamic compression experiment of concrete made of desert sand.The dynamic failure processes of concrete different in specimen size,impact velocity,desert sand replacement ratio,size and volume content of coarse aggregate were simulated.Research results showed that concrete made of desert sand had size-effect and was rate-dependent.The peak stress of concrete made of desert sand declined with the minimum size of coarse aggregate.However,the peak stress of concrete made of desert sand increased first,and then declined with the volume content and maximum size of coarse aggregate. | Liu Haifeng Ma Jurong Wang Yiying Ning Jianguo | 2017 | Acta Mechanica Solida Sinica2017，30，6： | 12 |
| 6 | Mechanical behaviors and damage constitutive model of ceramics under shock compression显示文摘一个阶段轻煤气的枪被利用学习受到装载的吃惊的 AD90 氧化铝的动态机械性质。锰铜计量器被采用获得压力时间历史。为任何反射镜(VISAR ) 的速度干涉仪系统被用来获得免费表面速度侧面并且决定 Hugoniot 有弹性的限制。Hugoniot 曲线与试验性的数据被适合。从 Hugoniot 曲线, AD90 氧化铝的压缩行为被发现从橡皮典型地改变到“塑料”。为在影响装载下面的氧化铝的动态机械行为被使用 Lagrange 分析的路径线原则分析,包括在材料的冲击波的非线性的特征,紧张率依赖,分散和偏斜。对受到动态压缩装载的陶艺适用的一个损坏模型被开发了。模型基于损坏微力学和翅膀裂缝成核和生长。动态破裂力量上的微裂缝的成核和起始的裂缝尺寸的参数的效果被讨论。动态损坏进化模型的结果与试验性的结果相比,一个好协议被发现。 | Jianguo Ning Huilan Ren Ping Li | 2008 | Acta Mechanica Sinica2008，24，3： | 10 |
| 7 | A study of the perforation of stiffened plates by rigid projectiles显示文摘In the present paper, a four-stage perforation model that accurately predicts the residual velocity is developed by adopting an energy method. The four stages are plug formation, dishing formation, petal formation and projectile exit. In addition, some important experimental results are presented and analyzed to validate the present perforation model. In the experiments, high speed camera system is used to record the perforation process. Observations on target damage and measurements of initial velocities and residual velocities with the aid of the system are presented. Numerical simulations are carried out for projectiles against single and layered plates adopted in the experiments. The perforation process is studied and the deformation and failure modes are obtained. The predictions of numerical simulations and analytical model are found in reasonably good agreement with those of experiments, and can be used to predict the ballistic limit and residual velocity of stiffened plates perforated by rigid projectiles. | Jianguo Ning Weidong Song Jing Wang | 2005 | Acta Mechanica Sinica2005，21，6： | 9 |
| 8 | Soft–strong supporting mechanism of gob-side entry retaining in deep coal seams threatened by rockburst显示文摘When gob-side entry retaining is implemented in deep coal seams threatened by rockburst, the cementbased supporting body beside roadway will bear greater roof pressure and strong impact load. Then the supporting body may easily deform and fail because of its low strength in the early stage. This paper established the roadside support mechanical model of gob-side entry retaining. Based on this model,we proposed and used the soft–strong supporting body as roadside support in the gob-side entry retaining. In the early stage of roof movement, the soft–strong supporting body has a better compressibility, which can not only relieve roof pressure and strong impact load, but also reduce the supporting resistance and prevent the supporting body from being crushed. In the later stage, with the increase of the strength of the supporting body, it can better support the overlying roof. The numerical simulation results and industrial test show that the soft–strong supporting body as roadside support can be better applied into the gob-side entry retaining in deep coal seams threatened by rockburst. | Ning Jianguo Wang Jun Liu Xuesheng Qian Kun Sun Bi | 2014 | International Journal of Mining Science and Technology2014，24，6： | 9 |
| 9 | Numerical simulation of shock wave interaction with a deformable particle based on the pseudo arc-length method显示文摘In this paper, we combine the pseudo arc-length numerical method with the mathematical model of multiphase compressible flow for simulating the shock wave interaction with a deformable particle. Firstly, an arc-length parameter is introduced to weaken the discontinuous singularity of governing equations, and an efficient pseudo arc-length numerical method of multiphase compressible flow is proposed. Then the accuracy and adaptive moving mesh property of this algorithm are tested. Finally, the multiphase pseudo arc-length numerical method is applied to the problem of interaction between shock wave and the deformable particle. Through the flow flied change and data analysis of key points, it can be found the complex wave structures are presented after the interactions between the planar incident shock wave and the metal particle, and all these wave interactions lead to the movement and deformation of metal particle, and then the deformed particle will affect the transmitted shock wave back. According to the discussion, the deformation of particle and shock wave propagation in the particle are determined by the shock wave impedance of each medium and shock speed, so the interaction between shock wave and the deformable particle can be studied on the basis of physical properties of explosive mediums. | NING JianGuo WANG Xing MA TianBao WANG Cheng | 2015 | Science China(Technological Sciences)2015，58，5： | 8 |
| 10 | A hybrid VOF and PIC multi-material interface treatment method and its application in the penetration显示文摘A hybrid VOF and PIC multi-material interface treatment method for Eulerian method is presented in this study in order to solve the problem that the Eulerian method is not robust enough to treat the dynamic fracture of material. This treatment method is used in the important computational region such as the material interface,large deformation region and fracture region where more particles are added for calculation,while the continuous transport method is used in the other regions. Through this method,a series of penetration problems such as blunt projectile penetration into the steel target and steel projectile penetration into concert target are numerically simulated. The comparison of the numerical result and experimental result shows that the hybrid algorithm can effectively track the deformation in the process of penetration and also insure precision and efficiency. | MA TianBao,WANG Jing & NING JianGuo State Key Laboratory of Explosion Science and Technology,Beijing Institute of Technology,Beijing 100081,China | 2010 | Science China(Physics,Mechanics & Astronomy)2010，53，2： | 8 |
| 11 | Jet formation and penetration mechanism of W typed shaped charge显示文摘Existing classical shaped charges are well knownfor their longer jets capable of achieving large hole depth tohole diameter ratios in metallic targets.However,in some sit-uations,there arises demand to obtain 1:1 ratio for hole depthto hole diameter which is beyond normal shaped chargescapability.A new variant of shape charge,named W typedshape charge(WSC),is proposed in this paper,which canmeet the demand of 1:1 ratio,and is based on the geometrythat can produce annular jets upon proper initiation scheme.In this paper,we present formation and penetration resultsof WSC based on three different schemes.We also showthat not all WSC designs can form annular jets,only annu-larly initiated WSC,which also fulfils the 'Internal-ExternalLiners Equal-Impulse' criterion,has the capability to formannular jet.The experimental and numerical results show thatwhen the ratio between annular initiation ring diameter andthe charge diameter is 0.75,an annular jet is formed,whichwas also supported by high speed photographs performedin vacuum.2D numerical simulations are performed withindigenously developed simulation software,where Eulerianapproach with multi-material interface tracking algorithm isutilized,to find various mechanisms involved during jet for-mation process.The calculation results are found in goodagreement with the experimental results,indicating that theinterface treatment algorithm proposed in this paper can notonly deal with large deformation problem,but also depictclearly the variation of materials interface.It is especially suitable for simulation of the process from liner collapse toformation of shaped charge jet. | Cheng Wang Fenglei Huang Jianguo Ning State Key Laboratory of Explosion Science and Technology,Beijing Institute of Technology, 100081 Beijing, China | 2009 | Acta Mechanica Sinica2009，25，1： | 7 |
| 12 | Theoretical and numerical research of wire array Z-pinch and dynamic hohlraum at IAPCM显示文摘Dense Z-pinch plasmas are powerful and energy-efficient laboratory sources of X-rays,and show the possibility to drive inertial confinement fusion(ICF).Recent advances in wire-array Z-pinch and Z-pinch dynamic hohlraum(ZPDH)researches at the Institute of Applied Physics and Computational Mathematics are presented in this paper.Models are setup to study different physical processes.A full circuit model(FCM)was used to study the coupling between Z-pinch implosion and generator discharge.A mass injection model with azimuthal modulation was setup to simulate the wire-array plasma initiation,and the two-dimensional MHD code MARED was developed to investigate the Z-pinch implosion,MRT instability,stagnation and radiation.Implosions of nested and quasi-spherical wire arrays were also investigated theoretically and numerically.Key processes of ZPDH,such as the arrayefoam interaction,formation of the hohlraum radiation,as well as the following capsule ablation and implosion,were analyzed with different radiation magneto-hydrodynamics(RMHD)codes.An integrated 2D RMHD simulation of dynamic hohlraum driven capsule implosion provides us the physical insights of wire-array plasma acceleration,shock generation and propagation,hohlraum formation,radiation ablation,and fuel compression. | Ning Ding Yang Zhang Delong Xiao Jiming Wu Zihuan Dai Li Yin Zhiming Gao Shunkai Sun Chuang Xue Cheng Ning Xiaojian Shu Jianguo Wang | 2016 | Matter and Radiation at Extremes2016，1，3： | 7 |
| 13 | Similar simulation study on the deformation and failure of surrounding rock of a large section chamber group under dynamic loading显示文摘Large and super-large section chamber groups in coal mines are frequently affected by dynamic loads resulting from production activities such as roadway driving and blasting.The stability of the surrounding rock is poor,and it is difficult to control.In this paper,a similar simulation test was used to study the deformation and evolution laws of the surrounding rock of a triangle-shaped chamber group under different dynamic loads.The results showed that under dynamic loading,the vertical stress of the surrounding rock of the chamber group increased in an oscillatory form.The maximum stress concentration coefficient reached 4.09.The damage degree of the roof was greater than that of the two sides.The deformation of the roof was approximately 1.2 times that of the two sides.For the chamber closer to the power source,the stress oscillation amplitude of the surrounding rock was larger,and the failure was more serious.The force of the anchorage structure showed a phased increasing characteristic;additionally,the force of the anchorage structure on the adjacent side of the chambers was greater than that on the other side.This study reveals the deformation and failure evolution laws of the surrounding rock of large section chamber groups under dynamic loading. | Xuesheng Liu Shilin Song Yunliang Tan Deyuan Fan Jianguo Ning Xuebin Li Yanchun Yin | 2021 | International Journal of Mining Science and Technology2021，31，3： | 6 |
| 14 | Dynamic constitutive modeling of frozen soil under impact loading显示文摘In this study, an isotropic hardening constitutive model is presented to study the behavior of frozen soil under impact loading. In plasticity, a modified Drucker–Prager yield function is adopted. Based on the experimental investigations at different strain rates and different temperatures by means of split Hopkinson pressure bar, the Drucker–Prager criterion has been modified with consideration in the effect of strain rate, and the model parameters have been determined. Compared the constitutive model with the experimental results, the predicted tendencies of the model corresponded well to the test curves. | Jianguo Ning Yuexiang He Zhiwu Zhu | 2014 | Chinese Science Bulletin2014，59，26： | 5 |
| 15 | Geochemical Anomaly at the Devonian/Carboniferous Boundary, Huangmao, Gnangxi, China显示文摘The abundances of nearly 40 elements, Ir included, have been measured using radio-chemical and instrumental neutron activation analysis (RNAA and INAA) across a Devonian/Carboniferous (D/C) boundary section at Huangmao, Guangxi, China. The Ir anomaly has been found in the D/C boundary bed. Its peak value is 156 ppt, richer by a factor of 12 than that in the underlying strata. Besides, as with Ir, other siderophile and chalcophile elements such as Au. Ni. Co. As and Sb are also enriched. The cause for the abundance anomalies of Ir and other elemets is discussed. Neither volcanic eruption nor extraterrestrial impact can explain it satisfactorily. The real mechanism for the anomalies awaits further study. | Chai Zhifang~①, Mao Xueying~①, Ma Shulan~①, Bai Shunliang~②,Zhou Yaoqi~①, Ma Jianguo~① and Ning Zhongshan~③ ①Institute of High Energy Physics, Academia Sinica, P. O. Box 2732, Beijing, China②Department of Geology, Beijing University, Beijing, China.③Guangxi Petroleum Exploration & Exploitation Co., Nanning, Guangxi. China. | 1989 | Acta Geologica Sinica(English Edition)1989，63，3： | 5 |
| 16 | A special numerical method for fluid-structure interaction problems subjected to explosion and impact loading显示文摘A three-dimensional(3D) embedded Eulerian-Lagrangian method is proposed to simulate the 3D fluid-structure interaction(FSI) problems subjected to explosion and impact loading. This method achieves a high-quality calculation of fluid and structure deformation by adding Lagrangian particles to Eulerian grids. The overall computational domain is solved by the Eulerian method, and the Lagrangian particles with specified volume and influence domains are used to track structural deformations. The bidirectional mapping of physical quantities is achieved using the weighted average of the influence domain, which are based on the topological relationship between Eulerian grids and Lagrangian particles. Then, the data dependence solution and parallel algorithm realization are presented for the large-scale numerical calculations of explosion and impact problems. Additionally, the corresponding parallel program is developed based on the message passing interface(MPI) standard, and the parallel efficiency of parallel hydrocode are tested. The numerical results of typical explosion and impact problems are compared with corresponding experimental data to verify the effectiveness of the method. These comparisons show that the embedded EulerianLagrangian method successfully combine the advantages of both the Eulerian and Lagrangian methods to efficiently calculate the processes of large deformation and dynamic damage to the materials. The results presented in this work provide a useful reference point for further research on explosion and impact problems. | NING JianGuo MENG FanLin MA TianBao XU XiangZhao | 2020 | Science China(Technological Sciences)2020，63，7： | 4 |
| 17 | Study on dynamic response of multi-body structure under explosive driving显示文摘In this study, a complex multi-body structure was proposed, and the mechanism for the dynamic response of the structure under explosive driving was investigated by using the Lagrange equations of the second kind. An initial value subject to explosion loading was analyzed to develop the theoretical model of the dynamic response, and the centroid trajectory of three different structural shapes was solved. To verify the accuracy of the theoretical model, numerical simulation via finite element analysis within LS-DYNA and a dynamic experiment were conducted, and the consistent dynamic response process of the multi-body structure was obtained. In addition, the dynamic response time of the multi-body structure under different explosion loading conditions was calculated by the theoretical model, numerical simulation, and experimental investigation. It was found that the increased opening charge mass reduces the dynamic response time. | ZHAO YuZhe MA TianBao LI Jian NING JianGuo | 2016 | Science China(Technological Sciences)2016，59，9： | 4 |
| 18 | Experimental Study on the Dynamic Mechanical Properties of Reinforced Concrete under Shock Loading显示文摘A simple experimental method was introduced to study the mechanical properties of reinforced concrete under shock loading. The one-stage light gas gun was used to test the mechanical properties of reinforced concrete with different reinforcement ratios under various impact velocities. Three Mn-Cu piezoresistive pressure gauges embedded in the target were used to record the voltage-time signals, from which the stress-strain curves of reinforced concrete were obtained using Lagrangian analysis. Experimental results indicated that the load-bearing capacities of reinforced concrete increased greatly with the impact velocity and the reinforcement ratio. The peak stress of the shock wave decreased exponentially with the propagation distance. | Haifeng Liu Jie Fu Jianguo Ning | 2016 | Acta Mechanica Solida Sinica2016，29，1： | 4 |
| 19 | A constitutive model of frozen soil with damage and numerical simulation for the coupled problem显示文摘Based on the microcosmic mechanics of composite materials, an elastic constitutive model for frozen soil with damage is presented. For frozen sandy soil with a range of ice contents and under a range of temperature conditions, quantitative results determined by this constitutive model agree with practically measured stress-strain curves. After numerically simulating the coupled water, temperature and stress fields of channel frozen and frozen roadbed using a self-developed finite-element routine, more accurate and practical calculation results for the temperature field coupled with stress, displacement and strain fields are obtained; the results match predictions and tests undertaken by earlier researchers. Our results support the reliability of our routine for calculating interdependent physical quantities of frozen soil and for describing the relationships between them. Our program can offer necessary constraints for engineering design and construction in permafrost regions. | ZHU ZhiWu, NING JianGuo& MA Wei 1 School of Mechanics and Engineering, Southwest Jiaotong University, Chengdu 610031, China 2 State Key Laboratory of Explosion Science and Technology, Beijing Institute of Technology, Beijing 100081, China 3 Key Laboratory of Frozen Soil Engineering, CAREERI, CAS, Lanzhou 730000, China | 2010 | Science China(Physics,Mechanics & Astronomy)2010，53，4： | 3 |
| 20 | Fragment spatial distribution of prismatic casing under internal explosive loading显示文摘Non-cylindrical casings filled with explosives have undergone rapid development in warhead design and explosion control.The fragment spatial distribution of prismatic casings is more complex than that of traditional cylindrical casings.In this study,numerical and experimental investigations into the fragment spatial distribution of a prismatic casing were conducted.A new numerical method,which adds the Lagrangian marker points to the Eulerian grid,was proposed to track the multi-material interfaces and material dynamic fractures.Physical quantity mappings between the Lagrangian marker points and Eulerian grid were achieved by their topological relationship.Thereafter,the fragment spatial distributions of the prismatic casing with different fragment sizes,fragment shapes,and casing geometries were obtained using the numerical method.Moreover,fragment spatial distribution experiments were conducted on the prismatic casing with different fragment sizes and shapes,and the experimental data were compared with the numerical results.The effects of the fragment and casing geometry on the fragment spatial distributions were determined by analyzing the numerical results and experimental data.Finally,a formula including the casing geometry parameters was fitted to predict the fragment spatial distribution of the prismatic casing under internal explosive loading. | Tianbao Ma Xinwei Shi Jian Li Jianguo Ning | 2020 | Defence Technology(防务技术)2020，16，4： | 3 |
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