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Three-dimensional constitutive model for magneto-mechanical deformation of NiMnGa ferromagnetic shape memory alloy single crystals

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Acta Mechanica Sinica 2019年第3期35卷 563-588页

作者： Chao Yu Guozheng Kang di song Xi Xie State Key Laboratory of Traction Power Southwest Jiaotong UniversityChengdu 610031China Applied Mechanics and Structure Safety Key Laboratory of Sichuan Province School of Mechanics and EngineeringSouthwest Jiaotong UniversityChengdu 610031China School of Mechatronics Engineering University of Electronic Science and Technology of ChinaChengdu 610031China

Existing experimental results have shown that four types of physical mechanisms, namely, martensite transformation, martensite reorientation, magnetic domain wall motion and magnetization vector rotation, can be activated during the magneto-mechanical deformation of NiMnGa ferromagnetic shape memory alloy (FSMA) single crystals. In this work, based on irreversible thermodynamics, a three-dimensional (3D) single crystal constitutive model is constructed by considering the aforementioned four mechanisms simultaneously. Three types of internal variables, i.e., the volume fraction of each martensite variant, the volume fraction of magnetic domain in each variant and the deviation angle between the magnetization vector, and easy axis are introduced to characterize the magneto-mechanical state of the single crystals. The thermodynamic driving force of each mechanism and the thermodynamic constraints on the constitutive model are obtained from Clausius's dissipative inequality and constructed Gibbs free energy. Then, thermodynamically consistent kinetic equations for the four mechanisms are proposed, respectively. Finally, the ability of the proposed model to describe the magneto-mechanical deformation of NiMnGa FSMA single crystals is verified by comparing the predictions with corresponding experimental results. It is shown that the proposed model can quantitatively capture the main experimental phenomena. Further, the proposed model is used to predict the deformations of the single crystals under the non-proportional mechanical loading conditions.

关键词： Ferromagnetic shape memory alloys Single crystals Magneto-mechanical deformation Martensite transformation Martensite reorientation Constitutive model

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Review on structural fatigue of NiTi shape memory alloys:Pure mechanical and thermo-mechanical ones

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Theoretical & Applied Mechanics Letters 2015年第6期5卷 245-254页

作者： Guozheng Kang di song School of Mechanics and Engineering Southwest Jiaotong University School of Mechatronics Engineering University of Electronic Science and Technology of China

Structural fatigue of NiTi shape memory alloys is a key issue that should be solved in order to promote their engineering applications and utilize their unique shape memory effect and super-elasticity more sufficiently. In this paper, the latest progresses made in experimental and theoretical analyses for the structural fatigue features of NiTi shape memory alloys are reviewed. First, macroscopic experimental observations to the pure mechanical and thermo-mechanical fatigue features of the alloys are summarized; then the state-of-arts in the mechanism analysis of fatigue rupture are addressed; further, advances in the construction of fatigue failure models are provided; finally, summary and future topics are outlined.

关键词： NiTi shape memory alloy Mechanical fatigue Thermo-mechanical fatigue Failure mechanism Failure model

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Neutral dissociation of methane in the ultra-fast laser pulse

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Chinese Science Bulletin 2008年第13期53卷 1946-1950页

作者： song di LIU Kai KONG FanAo XIAAnDong Institute of Chemistry Chinese Academy of Sciences Beijing 100190 China Graduate University of Chinese Academy of Sciences Beijing 100049 China

Neutral fragments of methane were performed using femetosecond laser at an intensity of 1013-14W/cm2. A new mechanism of neutral dissociation is proposed in this work. The methane molecule is excited to super-excited states,in which it would dissociate into neutral fragments. We made Morse type potential energy surfaces for the super-excited molecules. Furthermore,we investigated the dissociation dy-namics of the super-excited states by using quasi-classical trajectory (QCT) method. The results thus interpret the neutral dissociation of the methane molecule in the ultra-fast laser pulse.

关键词：激光脉冲激光场中性解离摩尔斯式电码

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Scientific literature addressing brain glioma in the Web of Science A 10-year bibliometric analysis

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Neural Regeneration Research 2011年第32期6卷 2537-2544页

作者： Zaihua Xu Tao Tang Dongsheng Pan di Fan Zhenquan song Hongli Xue Department of Neurosurgery General Hospital of Shenyang Military Command of Chinese PLA Shenyang 110016 Liaoning ProvinceChina

Brain glioma is a hot topic in recent years; however, brain glioma remains poorly understood. A bibliometric analysis based on the Science Citation Index （SCI） published by the Institute of Scientific Information （ISI） was performed to identify the global research and to improve the understanding of research trends in the brain glioma field from 2001 to 2010. During 2001 to 2010, there were 8 413 papers addressing brain glioma added to the SCI, and this trend is increasing annually. Of these reports, 6 945 papers are written in English. Journals published in the United States had the most papers, including ten core source titles. The Journal of Neuro-Oncology published the most articles followed by Cancer Research. Furthermore, the University of California San Francisco, is the most productive institution for publishing articles in the brain glioma field. Finally, this study highlights the topics in brain glioma research that are being published around th~ world.

关键词： brain glioma bibliometrics SCI analysis scientific literature

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Pulse width effect on the dissociation probability of CH_4^+ in the intense femtosecond laser field

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Chinese Science Bulletin 2006年第10期51卷 1269-1272页

作者： WANG Cao song di LIU Yuyan KONG Fan'ao Institute of Chemistry Chinese Academy of Sciences Beijing 100080 China Wuhan Institute of Physics and Mathematics Chinese Academy of Sciences Wuhan 430071 China Graduate School of Chinese Academy of Sciences Beijing 100049 China

The laser pulse width effect on the dis- sociation probability of CH4+ irradiated by an ultrafast laser has been investigated experimentally and theoretically. The femtosecond laser at 800 nm with an intensity of 8.0 × 1013 W/cm2 was used. The ob- served relative yield of the primary fragment ion CH3+ increases with increasing pulse width and tends to saturate when the pulse width is longer than 120 fs. The field-assisted dissociation (FAD) model and quasi-classical trajectory (QCT) calculation were ap- plied to predicting the dissociation probability of CH4+. The calculated probability is corrected with the mo- lecular orientation effect and the spatial distribution of laser intensity. The modified results show that the dissociation requires at least 23 fs and saturates with long pulse widths (≥100 fs). The result is ap- proximately consistent with the experimental observa- tion.

关键词：毫微微秒激光器强激光区甲烷离解概率激光脉冲宽度

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Study on Key Techniques for Multi-scale Expression of Laneway Traverse Data in MGIS

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Journal of China University of Mining and Technology 2007年第4期17卷 508-512页

作者： ZHANG Hai-rong YU Jing-song-di LIU Wei School of Environmental Science and Spatial lnformatics China University of Mining ＆ Technology Xuzhou Jiangsu 221008 China

The multi-scale expression of enormously complicated laneway data requires differentiation of both contents and the way the contents are expressed. To accomplish multi-scale expression laneway data must support multi-scale transformation and have consistent topological relationships. Although the laneway data generated by traverse survey-ing is non-scale data it is still impossible to construct a multi-scale spatial database directly from it. In this paper an al-gorithm is presented to first calculate the laneway mid-line to support multi-scale transformation; then to express topo-logical relationships arising from the data structure; and,finally,a laneway spatial database is built and multi-scale ex-pression is achieved using components GIS-SuperMap Objects. The research result is of great significance for improv-ing the efficiency of laneway data storage and updating,for ensuring consistency of laneway data expression and for extending the potential value of a mine spatial database.

关键词： multi-scale expression traverse data MGIS laneway mid-line

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Ocular manifestations of internal carotid artery dissection

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International Journal of Ophthalmology(English edition) 2019年第5期12卷 834-839页

作者： Jin-Xin song Xue-Mei Lin Zhao-Qin Hao song-di Wu Yong-Xin Xing Department of Ophthalmology the First Hospital of Xi'an Shaanxi Institute of Ophthalmology First Affiliated Hospital of Northwestern University Medical College of Xi'an Jiaotong University Department of Neurology the First Hospital of Xi'an

Internal carotid artery dissection(ICAD) results from disruption of the intima of the arterial wall, and can lead to intrusion of blood into the arterial wall and form an intramural hematoma. The hematoma can compress the true lumen of the vessel, causing functional stenosis or occlusion. The classic triad signs of ICAD include pain in the ipsilateral neck, head and orbital regions; a(partial) Horner syndrome; and cerebral or retinal ischemia. However, not all ICAD patients present with this classic signs. In some cases, ocular manifestations are the initial(and sometimes the only) findings. We summarize the ocular manifestations associated with ICAD in 3 categories: visual symptoms, oculosympathetic palsy, and ocular motor nerve palsy.

关键词： internal carotid artery dissection ocular manifestation oculosympathetic palsy ocular motor nerve palsy visual symptoms

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Analysis on the law of occurrence of shallow geothermal energy in Zhoukou City of Henan Province, China

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Journal of Groundwater Science and Engineering 2019年第3期7卷 282-287页

作者： XING Hui di Yan-song YONG Yi No.5 Institute of Geo-Exploration of Henan

In this paper,through data collection and field investigation,the development and utilization status of shallow geothermal energy in Zhoukou urban area was *** on the analysis of hydrogeological conditions,rock and soil structure characteristics and field test research,the spatial distribution characteristics of rock and soil in the study area were *** study shows that Zhoukou City is located in the alluvial plain of Huanghuai,and the loose deposits of river alluvial genesis range 0-200 *** loose deposits and groundwater stored in their pores are the main carriers of shallow geothermal *** the central part of the Yinghe River in the middle of the study area,the aquifer thickness is within 200 m,the particle size is coarser,the water-bearing degree and recharge capacity is *** this basis,the paper uses AHP to evaluate the suitability of shallow geothermal energy development and utilization to guide the rational development and utilization of shallow geothermal energy resources.

关键词： Zhoukou City Shallow geothermal energy Thermal physical characteristics Water abundance Ability of recirculation Shallow geothermal area

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ON LINE MONITORING OF BURNING THROUGH FOR SHORT CIRCUIT CO_2 ARC WELdiNG BASED ON THE SELF-ORGANIZE FEATURE MAP NEURAL NETWORKS

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Chinese Journal of Mechanical Engineering 2001年第2期14卷 106-110页

作者： Li di song Yonglun Ye Feng Mechatronics Engineering Department, South China University of Technology 华南理工大学机电工程系广东广州

A method for automatic detection of burning through of short circuit CO 2 arc welding is presented. It is based on the extraction of arc signal features as well as classification of the obtained features using self organize feature map(SOM) neural networks in order to get the weld quality information, for example, to determine if there is defect in the product. This is important for the on line monitoring of weld quality especially in robotic welding and lay the foundation for the further real time control of weld quality.

关键词： Weld Quality Defect SOM Neural networks CO 2 arc welding

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Determination of particle size distribution by multi-scale analysis of acoustic emission signals in gas-solid fluidized bed

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Journal of Zhejiang University-Science A(Applied Physics & Engineering) 2011年第4期12卷 260-267页

作者： Cong-jing REN Jing-dai WANG di song Bin-bo JIANG Zu-wei LIAO Yong-rong YANG State Key Laboratory of Chemical Engineering Department of Chemical and Biochemical Engineering Zhejiang University Hangzhou 310027 China

Particle size distribution(PSD) is an important parameter in the process of fluidization,and it always plays a crucial role in a gas-solid fluidized system.A PSD model for on-line PSD determination based on acoustic emission(AE) measurement was developed according to the mechanism of particle collision with the inner wall of the cylinder and multi-scale wavelet decomposition *** PSD model illuminates the quantitative relationship between the energy percentage of AE signals for different scales and the PSD,which indicates the feasibility of the application of the PSD *** were undertaken both in lab and plant gas-solid fluidized setup with polyethylene particles,and the parameters of the PSD model were calibrated and *** experimental conditions and results proved that the PSD model was suitable for on-line measurement and was sufficiently sensible and *** agglomeration,the PSD model also showed exact serviceability on detecting the onset of agglomeration by abnormal PSD,and the result agreed with that from the radiation ***,AE measurement was found to be a reliable and credible means for understanding the PSD information that affects the behavior of a system,which can provide valuable guidance for practical applications.

关键词： Particle size distribution(PSD) Acoustic emission(AE) Fluidized bed Multi-scale Agglomeration

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