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| 1 | Seismic wave input method for three-dimensional soil-structure dynamic interaction analysis based on the substructure of artificial boundaries显示文摘The method of inputting the seismic wave determines the accuracy of the simulation of soil-structure dynamic interaction. The wave method is a commonly used approach for seismic wave input, which converts the incident wave into equivalent loads on the cutoff boundaries. The wave method has high precision, but the implementation is complicated, especially for three-dimensional models. By deducing another form of equivalent input seismic loads in the fi nite element model, a new seismic wave input method is proposed. In the new method, by imposing the displacements of the free wave fi eld on the nodes of the substructure composed of elements that contain artifi cial boundaries, the equivalent input seismic loads are obtained through dynamic analysis of the substructure. Subsequently, the equivalent input seismic loads are imposed on the artifi cial boundary nodes to complete the seismic wave input and perform seismic analysis of the soil-structure dynamic interaction model. Compared with the wave method, the new method is simplifi ed by avoiding the complex processes of calculating the equivalent input seismic loads. The validity of the new method is verifi ed by the dynamic analysis numerical examples of the homogeneous and layered half space under vertical and oblique incident seismic waves. | Liu Jingbo Tan Hui Bao Xin Wang Dongyang Li Shutao | 2019 | Earthquake Engineering and Engineering Vibration2019，18，4： | 11 |
| 2 | Dynamic substructure model for multiple impact responses of micro/nano piezoelectric precision drive system显示文摘A dynamic substructure technique which considers the electromechanical coupling effect of the PZT and the inertial effect of flexible components is presented to study the multiple impact dynamic be- havior of micro/nano piezoelectric impact drive systems. It can investigate the step-like motion of ob- ject body and the multiple impacts behaviors reasonably by the comparison of the experimental data and the numerical solution of the spring-mass model. It is expected to have higher accuracy in the numerical simulations of the motion and the responses, especially to high frequency pulse voltage excitations. The present dynamic substructure technique has firstly studied reasonably the propaga- tions of piezoelectric-induced transient waves and impact-induced transient waves. It is helpful to the failure analysis and the design of piezoelectric stack and flexible components. The present dynamic substructure technique can be applied to the transient dynamics optimization design and the precision control of the micro/nano piezoelectric impact drive systems. | SHEN YuNian YIN XiaoChun | 2009 | Science China(Technological Sciences)2009，52，3： | 8 |
| 3 | Atomic force microscopic observation on substructure of pollen exine in Cedrus deodara and Metasequoia glyptostroboides显示文摘The substructure of pollen exine in Cedrus deodara (Roxb.) Loud, and Metasequoia glyptostroboides Hu et Cheng has been examined with an atomic force microscope (AFM). The results indicate that the exine substructure units containing sporopollenin in two species are similar in shape, which are granular, but slightly different in size. In Cedrus the substructure unit of pollen exine appears to be 56-99 nm long and 42-74 nm wide, while in Metasequoia it appears to be 81-118 nm long and 43-98 nm wide. It has been observed that the subunits of pollen exine in Cedrus arranged tightly to form short-rod-like or spheroidal pollen exine units, several or more than ten of which formed an island-like structure. There are various spaces among these island-like structures which are interconnected to occupy the entire pollen exine. In Metasequoia, the subunits of pollen exine also arranged tightly with a distribution tendency of cluster of 3-10, however, no obvious boundary exists among these clusters. From our | XING Shuping LI Bingshi WANG Chen HU Yuxi LIN Jinxing | 2000 | Chinese Science Bulletin2000，45，16： | 5 |
| 4 | Influence of soil——structure interaction on seismic collapse resistance of super-tall buildings显示文摘Numerous field tests indicate that the soilestructure interaction(SSI) has a significant impact on the dynamic characteristics of super-tall buildings,which may lead to unexpected structural seismic responses and/or failure.Taking the Shanghai Tower with a total height of 632 m as the research object,the substructure approach is used to simulate the SSI effect on the seismic responses of Shanghai Tower.The refined finite element(FE) model of the superstructure of Shanghai Tower and the simplified analytical model of the foundation and adjacent soil are established.Subsequently,the collapse process of Shanghai Tower taking into account the SSI is predicted,as well as its final collapse mechanism.The influences of the SSI on the collapse resistance capacity and failure sequences are discussed.The results indicate that,when considering the SSI,the fundamental period of Shanghai Tower has been extended significantly,and the collapse margin ratio has been improved,with a corresponding decrease of the seismic demand.In addition,the SSI has some impact on the failure sequences of Shanghai Tower subjected to extreme earthquakes,but a negligible impact on the final failure modes. | Mengke Li Xiao Lu Xinzheng Lu Lieping Ye | 2014 | Journal of Rock Mechanics and Geotechnical Engineering2014，6，5： | 4 |
| 5 | Damage detection test of a substructure model of the National Swimming Center显示文摘In order to detect the damage locations of complex spatial structures, a sensor region-based damage detection approach was developed based on the damage locating vectors method. A normalized damage locating index was introduced to identify the damage regions. An experiment on damage detection of a substructure model of the National Swimming Center 'Water Cube' was carried out. Two damage patterns were involved in the experiment. The test model was excited by using hammer impacts. Acceleration responses of the undamaged and damaged structure model were measured. Modal parameters were identified from the acceleration responses by utilizing the eigensystem realization algorithm (ERA). By using the developed sensor region-based method, the damage regions of the substructure model were located. The results show that the proposed method is able to effec- tively locate the damage regions. | QIAN JiaRu JI XiaoDong ZHANG WeiJing XU LongHe FU XueYi GU Lei | 2008 | Science China(Technological Sciences)2008，51，7： | 3 |
| 6 | Effect of welding heat input on microstructure and impact toughness in CGHAZ of X100Q steel显示文摘The coarse-grained heat-affected zones (CGHAZs) of X100Q steel were reproduced via simulating their welding thermal cycles with the varying heat input (Ef) from 10 to 55 kJ/cm in Gleeble3500 system. The microstructures were characterized, and the impact toughness was estimated from each simulated sample. The results indicate that the microstructure in each simulated CGHAZ was primarily constituted of lath-like bainite. With the decreased heat input and accordingly the lowered Ar3 (the onset temperature for this transition), the prior austenite grain and the bainitic packet/block/lath substructure were refined remarkably, and the impact toughness was enhanced due to the microstructure refinement. The bainitic packet was the microstructural unit most effectively controlling the impact properties in CGHAZ of X100Q steel, due to their close correlation with the 50% fracture appearance transition temperatures, their size equivalent to the cleavage facet and their boundaries impeding the crack propagation. | Hui-bin Wang Fei-long Wang Gen-hao Shi Yu Sun Jiang-cheng Liu Qing-feng Wang Fu-cheng Zhang | 2019 | Journal of Iron and Steel Research(International)2019，26，6： | 3 |
| 7 | EVOLUTION OF MICROSTRUCTURES AND HARDNESS DURING CONTINUOUS THERMO-MECHANICAL PROCESSING OF 6201 ALUMINUM ALLOY显示文摘Continuous thermo-mechanical processing (CTMP) of 6201 aluminum alloy was simulated on Gleeble-1500. The deformed specimens were analyzed by the observation of TEM and the measurement of hardness. It was shown that rapid solid solution and aging treatment can be effectively combined in one procedure by the strain induced during CTMP. The deformation temperature is ranging from 540* C to 300* C, the hardness increases directly before the 6th pass followed by a slight drop, the amount of precipitates increases with the holding time after deformation. Uniformly distributed and stabilized Mg2Si precipitates, as well as dislocation substructure can be observed on deformed specimens which have been subsequently held at 300℃ for 60 seconds. | H. Zhang, Y. Y. Liu, D. S. Peng and C. K. Wang (Department of Materials Science and Engineering, Central South University of Technology, Changsha 410083, China) | 2000 | Acta Metallurgica Sinica(English Letters)2000，13，2： | 3 |
| 8 | EFFECT OF SUBSTRUCTURE AND RESIDUAL STRESS IN STRENGTHENED LAYER ON FATIGUE STRENGTH OF STAINLESS OR LOW CARBON STEEL显示文摘In the strengthened layer of stainless steel after shot peening,there are a great amount ofdeformation microtwins which may act as structural strengthening factor and prevent thegradual relaxation of surface residual stress during fatigue,so as to keep its rather high levelof bending fatigue strength.However,in the strengthened surface layer of low carbon steel,dislocation cell structure is so unstalbe during fatigue that its surface residual stress relaxationcannot be retarded.Therefore,the bending fatigue strength of the low carbon steel can not beimprored by shot peening. | TAN Yuxu REN Liping LI Gang Xi’an Jiaotong University,Xi’an,China TAN Yuxu Associate Professor,Institute of Metallic Materials and Strength,Xi’an Jiaotong University,Xi’an 710048,China | 1990 | Acta Metallurgica Sinica(English Letters)1990，3，2： | 2 |
| 9 | Influence of nano-scaled dispersed second phase on substructure of deformed dispersion strengthened copper alloy显示文摘The deformation behavior of dispersion strengthened copper alloy Cu-Al2O3 was studied by TEM. The results show that nano-scaled dispersed second phase not only increases dislocation density in matrix, but also has an important influence on the dislocation substructure. The presence of fine dispersed Al2 O3 particles results in a uniform and random dislocation distribution in matrix copper and causes the difficulty in formation of dislocation cell structure and the decrease in the amount of cell structure during deformation. Deformation gives rise to much more dislocations and dislocation cells form more difficultly and the decrease in the cell size with the increase of dispersion degree. | CHENG Jian-yi WANG Ming-pu CAO Jian-guo ZHAO Xue-long GUO Ming-xing | 2005 | Journal of Central South University of Technology2005，12，z1： | 2 |
| 10 | Dynamic Finite Element Analysis for Interaction between Two Phase Saturated Soil Foundation and Platform显示文摘In this paper, the foundation soil of offshore structure is simulated as a two phase saturated porous medium. The dynamic equations of porous medium and finite element formulation are given. For structural analysis, the technique of multilevel substructure is used, and the saturated soil analysis is set in the highest level substructure model. Based on these theories a dynamic finite element analysis program DIASS for the analysis of interaction between two phase ocean soil foundation and platform structures has been developed. A numerical example is given here to illustrate the influence of the pore water in soil on the structural response of an ocean platform. | Qian, Lingxi Zhong, Wanxie Zhang, Hongwu | 1993 | China Ocean Engineering1993，8，1： | 2 |
| 11 | Key aspects on the behaviour of the ballast and substructure of a modern railway track:research-based practical observations in Finland显示文摘This paper presents an overview on the wide-ranging track structure studies at the Tampere University of Technology(TUT),Finland dealing with the key aspects of track geotechnics related to high-speed passenger traffic on ballasted tracks.Special attention is paid to ballast and sub-ballast,while also considering frost action,embankment stability,track stiffness,track geometry and transition zones.As a result,this paper states that understanding the ballast degradation mechanism and its consequences and assessment of its condition occupy an important role in the construction and maintenance of a smooth high-speed rail line.The choices related to building the sub-ballast also have a dramatic impact on later track deformations and maintenance needs.In cold climate,especially where seasonal frost occurs,understanding and taking into account the frost action mechanism is crucial.Especially in the maintenance and rehabilitation planning of existing tracks,high-class analyses of ground penetrating radar data and its integrated analysis with other data can yield considerable benefits. | Antti NURMIKOLU | 2012 | Journal of Zhejiang University-Science A(Applied Physics & Engineering)2012，13，11： | 2 |
| 12 | Model updating for real time dynamic substructures based on UKF algorithm显示文摘Combining the advantages of numerical simulation with experimental testing,real-time dynamic substructure(RTDS)testing provides a new experimental method for the investigation of engineered structures.However,not all unmodeled parts can be physically tested,as testing is often limited by the capacity of the test facility.Model updating is a good option to improve the modeling accuracy for numerical substructures in RTDS.In this study,a model updating method is introduced,which has great performance in describing this nonlinearity.In order to determine the optimal parameters in this model,an Unscented Kalman Filter(UKF)-based algorithm was applied to extract the knowledge contained in the sensors data.All the parameters that need to be identified are listed as the extended state variables,and the identification was achieved via the step-by-step state prediction and state update process.Effectiveness of the proposed method was verified through a group of experimental data,and results showed good agreement.Furthermore,the proposed method was compared with the Extended Kalman Filter(EKF)-based method,and better accuracy was easily found.The proposed parameter identification method has great applicability for structural objects with nonlinear behaviors and could be extended to research in other engineering fields. | Su Tingli Tang Zhenyun Peng Lingyun Bai Yuting Jin Xuebo Kong Jianlei | 2020 | Earthquake Engineering and Engineering Vibration2020，19，2： | 2 |
| 13 | Effect of Mn content on microstructure, tensile and impact properties of SA508Gr.4N steel for reactor pressure vessel显示文摘The effect of manganese(Mn)on the microstructure,tensile and impact properties of SA508Gr.4N steel has been experimentally investigated.The influence of Mn content on the substructure of SA508Gr.4N steel was investigated using the scanning electron microscope,electron back-scattered diffractometer and transmission electron microscope.It was found that the increased Mn content had a beneficial effect on both strength and toughness.Examination of microstructure revealed smaller size of block and larger number of high-angle grain boundaries with higher Mn content.The change of the ultimate tensile strength and toughness with increasing Mn content was attributed to the increased hardenability,the number of high-angle grain boundaries and the crack propagation path by the block refining. | Xi-kou He Zhi-qiang Yang Zhen Wang Shi-bin Qiao Zheng-dong Liu | 2020 | Journal of Iron and Steel Research(International)2020，27，4： | 1 |
| 14 | STRUCTURE CHARACTERISTICS OF MICROALLOYING AS-CAST MARTENSITIC CAST IRON显示文摘The microstructure and martensite substructure of as-cast martensitic high-Cr cast iron byinjection microalloying have been studied by usig SEM and TEM.The relationship betweendistribution of alloying elements and phase formation of carbide,as well as various branchingand distortion of carbide,have been analysed by X-ray diffractometer and EPMA. | ZHANG Jinghui LI Dajun ZHAO Jiuzhou JIA Jun Harbin Institute of Technology,Harbin,ChinaLI Jianhui Heilongjiang Association for Science and Technology,Harbin,China | 1991 | Acta Metallurgica Sinica(English Letters)1991，4，9： | 1 |
| 15 | SHOT-PEENING STRENGTHENED LAYER AND ITS EFFECT ON FATIGUE STRENGTH OF α-BRASS显示文摘In shot peened α-brass surface layer{111} type planar defects and deformation microtwinshave been observed by means of TEM analysis.The density of microtwins deereases with theincrease of layer depth.The enhancement of fatigue strength and the unrelaxation of residualstress after shot peening are concerned in the substructures of strengthened layer. | TAN Yuxu REN Liping LI Gang Xi’an Jiaotong University,Xi’an,China Institute of Metallic and Strength,Xi’an Jiaotong University,Xi’an,China | 1989 | Acta Metallurgica Sinica(English Letters)1989，2，4： | 1 |
| 16 | Substructuring Technique for Dynamics Analysis of Flexible Beams with Large Deformation显示文摘In this paper, the substructuring technique is extended for the dynamics simulation of flexible beams with large deformation. The dynamics equation of a spatial straight beam undergoing large displacement and small deformation is deduced by using the Jourdain variation principle and the model synthesis method. The longitudinal shortening effect due to the transversal deformation is taken into consideration in the dynamics equation. In this way, the geometric stiffening effect, which is also called stress stiffening effect, is accounted for in the dynamics equation. The transfer equation of the flexible beam is obtained by assembling the dynamics equation and the kinematic relationship between the two connection points of the flexible beam. Treating a flexible beam with small deformation as a substructure, one can solve the dynamics of a flexible beam with large deformation by using the substructuring technique and the transfer matrix method. The dynamics simulation of a flexible beam with large deformation is carried out by using the proposed approach and the results are verified by comparing with those obtained from Abaqus software. | 张建书 芮筱亭 刘飞飞 周秦渤 顾利琳 | 2017 | Journal of Shanghai Jiaotong university(Science)2017，22，5： | 1 |
| 17 | EIGENPROBLEM OF SUBSTRUCTURE CHAIN AND THE EXPANSION SOLUTION显示文摘In this paper,a new method for dealing with substructure chain is presented.Here,asubstructure chain means a structure consisting of a number of identical substructures connected in series.Thismethod is parallel to the expansion method in the structural analysis according to the transverse section.Themethod of shift invariance and that of initial parameter and transfer matrix,their mutual-relation and com-bined use,as well as the analysis of the eigenproblem on the transverse section,and the expansion methodbased on the eigenvectors are described in this paper. | Zhong Wanxie Lin Jiahao Qiu Chunhang (Dalian University of Technology Winning Software System Engineering Ltd.) | 1991 | Acta Mechanica Sinica1991，7，2： | 1 |
| 18 | The Evolution of Ultrafine Grained Structure Formation Through Isothermal Static Phase Transformation显示文摘In the current study,a 0.3C-2Si-2Mn-0.28Mo (in wt%) steel with high hardenability was deformed at a relatively low temperature followed by isothermal static phase transformation.This novel thermomechanical processing made it possible to successfully produce an ultrafine ferrite grained structure (~2 μm) in the absence of both dynamic phase transformation and controlled cooling.The use of a model Ni-30Fe austenitic alloy showed that the low temperature deformation induced very fine intragranular defects throughout the microstructure,which would then act as fine spaced ferrite nucleation sites at an early stage of phase transformation.As a result,the coarsening of ferrite was extremely limited during isothermal phase transformation,resulting a very fine ferrite grained structure;even nanoscale in the region of the prior austenite grain boundary. | HOSSEIN Beladi ILANA B Timokhina SUBRATA Mukherjee PETER D Hodgson | 2011 | Journal of Iron and Steel Research(International)2011，18，S1： | 0 |
| 19 | A crystal plasticity FE study of macro-and micro-subdivision in aluminium single crystals{001}<110>multi-pass rolled to a high reduction显示文摘In this study,the substructure formation in a multi-pass rolled aluminium single crystal{001}<110>was investigated by the crystal plasticity finite element model,and the predations were validated by experimental observations at both macro-and micro-scale.A finite element model for multi-pass rolling was developed to follow the real experimental rolling scheme,by which the through-thickness macroscopic subdivision was successfully predicted up to a 90%reduction.The macro-subdivision was featured by forming matrix bands through the thickness,and the deformation behaviours,in terms of slip activity,shear strain and crystal rotation,alternated between matrix bands.The development of matrix bands,stability of crystal orientations,and correlation between slip activity,shear strain and crystal rotation have been investigated.Another modelling method,Submodel,was used to exceedingly increase the mesh resolution in smaller regions of interest,and the experimentally observed microstructure,i.e.,micro-subdivision was explicitly and spatially revealed.Similar predictions were obtained in Submodels with different element sizes,which proves the feasibility of this method in predicting microstructure formation.It was found that the substructure formation by varying slip activity and crystal rotation between domains is energy favourable.The procedure of substructure formation was explained based on the predictions,three types of substructure have been identified,and the substructure formation was discussed. | Hui Wang Cheng Lu Kiet Tieu Yu Liu | 2021 | Journal of Materials Science & Technology2021，，17： | 0 |
| 20 | Analysis of Dynamic Interaction Between Deeply Embedded Platform and Foundation Soil显示文摘-Dynamic interaction characteristics of the model deeply embedded platform and foundation soil are studied by means of dynamic substructuring interface transformation synthesis and dynamic condensation. The theoretical analysis, computer programs and practical examples are presented; and the results are compared with those obtained by statical condensation method and finite element method. | Yao Minglun and Li Dacheng Professor, Tianjin University, Tianjing 300072 | 1994 | China Ocean Engineering1994，9，3： | 0 |
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