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Dynamic fracture characteristics of cylindrical steel shell under internal blast loading

International Journal of Materials and Structural Integrity 2015年第4期8卷 291-302页

作者： Hu, Yongle Liu, Qicheng Bai, Shuxin Zhang, Hong Key Laboratory of Safety Design and Reliability Technology for Engineering Vehicle Changsha University of Science and Technology ChangshaHunan Province410004 China College of Physics and Electronic Science Changsha University of Science and Technology Changsha410004 China College of Aerospace and Material Engineering National University of Defense Technology Changsha300072 China

Dynamic fracture characteristics are the foundation for conducting safety assessment and failure analysis of explosion containment vessels (ECVs) subjected to internal blast loading. The experiment was conducted to investigate dynamic fracture characteristics of cylindrical steel shells subjected to internal blast loading at the centre. The elastic-plastic response of cylindrical steel shells was simulated numerically by using nonlinear dynamic finite element analysis code LS-DYNA. The fracture mode and mechanism of a cylindrical shell were specially studied by means of the analysis of deformation, macrographs and meso-graphs of fracture surface and elastic-plastic response. The results show that the axial direction fracture surface of the cylindrical steel shell exhibits a mixed ductile fracture mode with shearing dimple by micro-voids coalescence. Dynamical ductility deformations appear and the shear bands form when the cylindrical steel shell expands under internal blast loading. The fracture mechanism is that the shear bands destroyed the initiation and growth of the micro-voids and micro-cracks along the shear bands due to its softening effect under tensile circumferential stress. The shear bands and the tensile circumferential stress dominate the final fracture mode. The fracture mode is the ductile fracture. Copyright © 2014 Inderscience Enterprises Ltd.

关键词： Shear bands

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A hybrid fault diagnosis approach for hydraulic systems by using radial basis function networks

International Journal of Control and Automation

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International Journal of Control and Automation 2014年第12期7卷 165-176页

作者： He, Xiang-yu Yang, Yijiao He, Shanghong State Key Laboratory of Fluid Power Transmission and Control Zhejiang University Hangzhou China Key Lab. of Lightweight and Reliability Technology for Engineering Vehicle Education Department of Hunan Province Changsha University of Science and Technology Changsha Hunan China

To improve the reliability of hydraulic systems, a fault diagnosis approach based on radial basis function (RBF) networks was proposed in this paper. According to the target fault features extracted from a fuzzy auto-regressive with extra outputs (FARX) model, RBF networks serve as a fault classifier and the output of the RBF networks is the result of fault diagnosis. Several typical faults of hydraulic systems were used to test the fault diagnosis approach. Experiment results showed that the fault diagnosis approach is feasible and effective for improving the reliability of hydraulic systems. © 2014 SERSC.

关键词： Failure analysis

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Influence and mechanism of local lattice deformation induced by dopants on the dehydrogenation thermodynamics of MgH2 20

Influence and mechanism of local lattice deformation induced...

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20th World Hydrogen Energy Conference, WHEC 2014

作者： Zhang, J. Education Department of Hunan Province Key Laboratory of Lightweight and Reliability Technology for Engineering Vehicle Changsha University of Science and Technology Changsha410114 China

Using first-principles calculations in combination with experimental study, the doping effect of transition metals such as Ti or Ni on the dehydrogenation thermodynamics of MgH2 hydride were investigated, and a new catalytic mechanism was proposed. The results show that the incorporation of either Ti or Ni decreases the hydrogen desorption enthalpy and dehydrogenation temperature. Comparatively, the doping effect of Ni element is more remarkable. The local lattice deformation or distortion induced by dopants was considered to be the essential reason for the improved dehydrogenation thermodynamics of doped MgH2, which provides a new catalytic mechanism for the doping of transition metals. Analysis of electronic structures suggests the dehydrogenation thermodynamics of doped MgH2 are closely associated with the energy gap near Fermi level as well as the bonding characteristics of MH (M=Mg, Ti, Ni) within lattice. Namely, the narrower energy gap as well as the more obvious covalent bonding characteristics of M-H corresponds to the more excellent dehydrogenation thermodynamics. Copyright © (2014) by the Committee of WHEC2014 All rights reserved.

关键词： Thermodynamics

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reliability-based design with the mixture of probability and non-probability convex models

Reliability-based design with the mixture of probability and...

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中国计算力学大会2014暨第三届钱令希计算力学奖颁奖大会

作者： X.Liu Z.Y.Zhang State Key Laboratory of Advanced Design and Manufacturing for Vehicle Body Hunan University Engineering Research Center of Catastrophic Prophylaxis and Treatment of Road & Traffic Safety Ministry of EducationChangsha University of Science and Technology

A new hybrid reliability analysis method is developed based on probability and ellipsoidal convex *** distributions are used to deal with the uncertain parameters with sufficient information,while the ellipsoidal convex model is employed to deal with the uncertain-but-bounded variables which are correlated with each ***,a complex nesting optimization problem will be involved in this hybrid reliability analysis and the traditional optimization method will lead to extremely low *** alleviate the computational burden,an efficient decoupling strategy is developed to solve the nesting optimization *** using Karush-Kuhn-Tucker necessary condition,the complex nesting optimization problem can be transformed to an equivalent single-layer optimization model with only random ***,the sequential quadratic programming(SQP)method is adopted to directly solve this equivalent *** present method is applied to the two numerical examples and the results are compared with the traditional nesting optimization me *** results indicate that the present method has a fine accuracy,and also an acceptable efficiency if not many uncertain parameters are involved.

关键词： Uncertainty Hybrid reliability approach Probability model Ellipsoidal convex model

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Disturbance observer based heave compensation control for benthic coring drill

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Open Mechanical engineering Journal 2013年第1期7卷 129-135页

作者： Guo, Y. Jing, Y.P. Jiang, M. Luo, B.W. Engineering Research Centre of Advanced Mining Equipment Ministry of Education Hunan University of Science and Technology HuNan Xiangtan 411201 China Key Laboratory of Lightweight and Reliability Technology for Engineering Vehicle Education Department of Hunan Province Changsha University of Science and Technology HuNan Changsha 410004 China

Severe environment in deep ocean affects operating reliability and security of coring drill. Adopting heave motion signal measured by accelerometer to confirm heave compensation of coring drill, the compensation control method is proposed using disturbance observer to restrain the disturbance. Then, the disturbance observer is designed. The heave motion simulation for coring drill is done with this control method, and the results show that the heave motion compensation control of coring drill using disturbance observer avoids the disturbance with high tracking quality, and provides high reliability and security to coring drill operating. © Guo et al.

关键词： Drills

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Geometry optimization design for crank-slider-CST type low rear protection device of truck: Geometry optimization for crank-slider mechanism

Geometry optimization design for crank-slider-CST type low r...

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International Conference on Consumer Electronics, Communications and Networks

作者： Lei, Muxi Wei, Shubin Lei, Zhengbao Li, Yonghan School of Civil Engineering and Architecture Changsha University of Science and Technology Changsha China Engineering Research Center of Catastrophic Prophylaxis and Treatment of Road and Traffic Safety Changsha University of Science and Technology Ministry of Education Changsha China Key Laboratory of Highway Engineering Changsha University of Science and Technology Ministry of Education Changsha China Hunan Province Communications Planning Survey and Design Institute Changsha China

ISBN: (纸本)9781612844572

With the crank-slider mechanism, applied the principle of Cutting the screw thread(CST) to the low rear protective device of truck, devised a new type of device which supplied a new solution for the crash incompatibility. Firstly, according to the dimension of certain type of Foton light-duty truck and the requirement of regulation, took the maximum transmission angle as optimized object, with the programming solution in Excel, obtained the length of crank-slider mechanism. Secondly, with the 3D modeling in Solidworks, obtained the 3D model, and eliminated the interference through its motion simulation module, which proved the device is feasible. © 2011 IEEE.

关键词： Trucks

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RETRACTED ARTICLE: Research on security measures under overpass bridge

RETRACTED ARTICLE: Research on security measures under overp...

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2011 2nd International Conference on Mechanic Automation and Control engineering, MACE 2011

作者： Guo, Jianbao Li, Yonghan Lei, Zhengbao Lei, Muxi Engineering Research Center of the Road Disaster Prevent and Mitigation and Transportation Safety Ministry of Education Changsha 410004 China Hunan Province Communications Planning Survey and Design Institute Changsha 410008 China Key Laboratory for Highway Engineering of Ministry of Education Changsha University of Science and Technology Changsha 410004 China School of Civil Engineering and Architecture Changsha University of Science and Technology Changsha 410004 China

ISBN: (纸本)9781424494392

In order to improve the safety of opening traffic under overpass bridge, on account of the accidents characteristic which occurs under overpass bridge, refer to the related national standards of traffic safety facilities designation, the research was made from the standpoint of induction from the line of sight, warning signs and markings and barrier protection, and the corresponding solutions were proposed. According to the layout characteristics of overpass bridge and highway, compared with the preferred method of the program, summed up the optimal matching attribute of traffic safety protection programs which were adapt to current and future traffic state under different types overpass bridge. © 2011 IEEE.

关键词： Bridges

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Optimization of the level of SS crash barrier Overpass Bridge on highway

Optimization of the level of SS crash barrier Overpass Bridg...

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2011 2nd International Conference on Mechanic Automation and Control engineering, MACE 2011

作者： Zhao, Jian Lei, Zhengbao Wang, Sujuan Li, Yonghan Lei, Muxi Engineering Research Center of Catastrophic Prophylaxis and Treatment of Road and Traffic Safety Ministry of Education Changsha University of Science and Technology ChangSha China Key Laboratory of Highway Engineering Ministry of Education Changsha University of Science and Technology ChangSha China School of Automotive and Mechanical Engineering Changsha University of Science and Technology ChangSha China Hunan Province Communications Planning Survey and Design Institute ChangSha China School of Civil Engineering and Architecture Changsha University of Science and Technology China

ISBN: (纸本)9781424494392

Based on traffic specification, the characteristics of traffic accidents on highway Overpass Bridge and current security situation associated, a new barrier has been developed to satisfy the requirement to endure the crash from large truck. To obtain the optimal structural parameters of barrier, an orthogonal method is applied to determine the vehicle- crash to barrier model that enables the simulation to 25 sets of crosssection parameters, in which design variations are 6 parameters from barrier cross-section and for each variation considerate 5 levels. Then, SPSS method is applied to analyze the 25 sets of experiment results. Consequently, parameters' effects on barrier performances are analyzed. Finally, a validation is performed based on optimal structural parameters obtained by analysis of SPSS. The result demonstrates the proposed barrier can prevent trucks of rolling and climbing effectively. Thus, overpass bridge pier is well protected. The barrier designed in this work has a good application characteristic. © 2011 IEEE.

关键词： Trucks

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The uncertainty optimization of vehicle occupant restraint system based on interval number programming

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Qiche Gongcheng/Automotive engineering 2011年第1期33卷 6-10页

作者： Li, Fangyi Li, Guangyao Zhang, Jiahong Sun, Guangyong Zhang, Zheng School of Automotive and Mechanical Engineering Changsha University of Science and Technology Changsha 410114 China Hunan University State Key Laboratory of Advanced Design and Manufacturing for Vehicle Body Changsha 410082 China Autoliv Vehicle Safety System Technical Center Co. Ltd Shanghai 201807 China

The uncertainty optimization of vehicle occupant restraint system is studied in this paper based on interval number programming. Firstly a simulation model for occupant restraint system is set up using MADYMO software with the model verified by tests. Then, a weighted injury criterion is taken as objective, and the stiffness and upper anchor position of seat belt, as well as the tearing force and stretch length of force limiter etc are selected as design variables with the stiffnesses of seat and knee bolster as uncertain variables, and the uncertainty optimization is transformed into certainty optimization by using interval number programming. Next, the surrogate models for objective and constraint functions are built with Latin hypercube experiment design, and by utilizing sequential quadratic programming and genetic algorithms as the solvers for inner and outer layers respectively, an optimization is performed. Finally the approximately optimum solutions of the parameters of occupant restraint system are obtained.

关键词： Stiffness

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A research of similarity design of collision guardrails under the overpass

A research of similarity design of collision guardrails unde...

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2011 2nd International Conference on Mechanic Automation and Control engineering, MACE 2011

作者： Wang, Sujuan Lei, Zhengbao Zhao, Jian Lei, Muxi Li, Yonghan Liu, Yiheng Engineering Research Center of Catastrophic Prophylaxis and Treatment of Road and Traffic Safety Ministry of Education Changsha University of Science and Technology ChangSha China Key Laboratory of Highway Engineering Ministry Of Education Changsha University of Science and Technology ChangSha China School of Automotive and Mechanical Engineering Changsha University of Science and Technology ChangSha China School of Civil Engineering and Architecture Changsha University of Science and Technology China Hunan Province Communications Planning Survey and Design Institute ChangSha China School of International Business AdministrationShanghai Shanghai University of Finance and Economics Yangpu District Shanghai China

ISBN: (纸本)9781424494392

In order to solve the safety problem of different grades roads and crashworthy capacity of overpass design, to meet the traffic safety requirements under different conditions, by using similar principle, several overpass crashworthy barrier in different levels had been gotten here, and had been proved to have better adaptability. In preliminary work, the optimum structure parameter of SH overpass crashworthy barrier had been gotten through orthogonal test, and this research is also based on the orthogonal test majorization result. During the similarity design, the similarity design for every parameter of barrier would be done through measuring the impact force, and to get the optimum structure parameters of overpass crashworthy barriers in different degrades. Finally, every group similarity majorization result had been checked, and the result showed that different grades crashworthy barrier which based on similarity principle design could meet the safety requirements for different crashworthy grades overpasses. This design not only could reduce cost, but also had better suitability and engineering utility. © 2011 IEEE.

关键词： Cost engineering

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