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3rd International Conference on Civil, Architectural and Hydraulic engineering (ICCAHE)

作者： Zhang, Xiao He, Jianhao Liang, Xinghua Huang, Shiqing Jinan Univ Dept Mech & Civil Engn Guangzhou 510632 Guangdong Peoples R China Jinan Univ MOE Key Lab Disaster Forecast & Control Engn Guangzhou 510632 Peoples R China

Ancient architecture in Europe is one of the most historic and characteristic system in the world. It follows the order of combining structure and aesthetics. Researching in the pendentive used in Hagia Sophia, this p... 详细信息

ISBN: (纸本)9783038352587

关键词： Hagia Sophia Pendentive Mechanical properties Architectural aesthetics

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Temperature-dependent diffusion process of methane through dry crushed coal

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Journal of Natural Gas Science and engineering 2015年 22卷 609-617页

作者： Xu Tang Zhiqiang Li Nino Ripepi A. Kyle Louk Zhaofeng Wang Dangyu Song Department of Mining and Minerals Engineering Virginia Polytechnic Institute and State University Blacksburg VA 24060 USA Henan Provincial Key Lab of Gas Geology and Control-Cultivation Base of Provincial and Ministry Joint State Key Henan Polytechnic University Jiao Zuo 454000 China State Key Laboratory of Coal Mine Disaster Dynamics and Control Chongqing University Chongqing 400030 China Collaborative Innovation Center of Central Plains Economic Region for Coalbed/Shale Gas Henan Province China

Temperature influence or geothermal effect is pervasive in the carbon dioxide geological sequestration , GIP (gas in place) estimation, and the Coal Mine Methane (CMM) degasification process. The temperature effects on the adsorption process are not explicitly considered in previous gas diffusion tests. This study seeks to treat the adsorption–diffusion process as a unified process and then investigate the temperature influence effect on this process. Isothermal tests under different constant temperatures show that 1) Langmuir constant-a is independent of temperature, and Langmuir constant-b can be treated as a negative linear function of temperature in engineering applications. Two groups of diffusion tests were conducted: diffusion under constant temperature and diffusion with increasing temperature. The diffusion tests show that 2) for the diffusion process with increasing temperature, the equivalent diffusion coefficient (D eq ) increases with increasing temperature, and this relationship can be described by the revised Arrhenius-style equation. 3) For the diffusion process under constant temperature, the diffusion coefficient (D) is dependent on temperature and independent of adsorption equilibrium pressure . The relationship between diffusion coefficient and temperature can also be described using the revised Arrhenius-style equation. 4) Diffusion coefficients range from 8.53 × 10 −8 cm 2 /s to 1.97 × 10 −7 cm 2 /s when temperature rises from 30 °C to 90 °C.

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Matrix of the Covariance of Unit Impulse Response Function for time-frequency damage detection and monitoring 9

Matrix of the Covariance of Unit Impulse Response Function f...

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9th International Conference on Structural Dynamics (EURODYN)

作者： Li, X. Y. Wang, L. X. Jinan Univ Minist Educ China Dept Mech & Civil Engn Key Lab Disaster Forecast & Control Engn Guangzhou 510632 Guangdong Peoples R China Earthquake Adm Guangdong Prov Guangzhou 510070 Guangdong Peoples R China

ISBN: (纸本)9789727521654

A new covariance matrix is formulated from the impulse response function of the acceleration responses of a structure under general excitation. The components of the covariance matrix are proved to be functions of the modal parameters (modal frequency, mode shape and damping parameter) of a structure. Information from all the vibration modes of the structure limited by the sampling frequency contributes to these components. This contains more structural information than other parameters obtained from existing methods. The error produced in the modal extraction procedure is also avoided. A new damage index vector is proposed based on the components of the covariance matrix. A simply supported thirty-one bar plane truss structure is numerically studied. Damage location and damage quantification are investigated separately using the proposed damage index vector. A pattern assurance criterion is used to analyze the covariance data, and multiple rounds of computation are performed to reduce the candidate set of elements in a strategy to search for the damage location of the structure. An optimization technique is adopted to determine further the damage location and extent with good accuracy. Single damage scenarios with different noise levels are studied with satisfactory results.

关键词： Impulse response function Damage identification Inverse problem Covariance

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CONTACT ANALYSIS FOR FIBER-REINFORCED, DELAMINATED LAMINATES WITH KINEMATIC NONLINEARITY

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Acta Mechanica Solida Sinica 2013年第4期26卷 388-402页

作者： Jianghong Xue Li Zi Hong Yuan Renhuai Liu Department of Mechanics and Civil Engineering Jinan University/Key Lab of Disaster Forecast and Control in Engineering Ministry of Education

A macro-micro analytical approach for the anti-penetrating contact problem at the interfaces of the delamination in symmetrically cross-plied,fiber-reinforced rectangular laminates is presented in this *** laminate is simply supported and subjected to a uniform transverse load with a through-width delamination buried at the center position.A contact factor is defined to characterize the contact effect and determined using the micro-mechanics of composite *** analyzing the kinematics of nonlinear deformation at the interfaces of the delamination,the contact force is *** solutions from perturbation analysis are *** is found that the deformation of the laminate involves a global deflection and a local *** antipenetrating contact effects are characterized by the local buckling and are intrinsic properties of the laminates,relying only on the geometries of the delamination and the material *** analyses show that the location and size of the contact areas and the distribution of the contact force are hardly affected by the aspect ratio.

关键词： rectangular laminate delamination contact effect perturbation approach nonlinear analysis

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Fiber pullout with stress transfer and fracture propagation

Fiber pullout with stress transfer and fracture propagation

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2014 International Conference on Industrial,Mechanical and Manufacturing Science(ICIMMS 2014)

作者： J.Y.Wu H.Yuan H.W.Gu MOE Key Laboratory of Disaster Forecast and Control in Engineering Institute of Applied MechanicsJinan University

In this paper,a nonlinear fracture mechanics approach has been introduced to derive theoretical solutions for the shear stress transfer and crack propagation along the interface of the pull-pull and pull-push fiber-matrix pullout model by using the assumed bilinear local bond-slip *** for the maximum load,shear stress and crack propagation along fiber-matrix interface are derived ***,numerical simulations are conducted to discuss the factors influencing the interfacial *** this paper emphasizes on fiber-matrix pullout test,the analytical solution is equally applicable to similar test between spindly bars of other materials and concrete.

关键词： crack propagation FRP interfacial mechanics fracture mechanics

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Kirigami-based stretchable lithium-ion batteries

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SCIENTIFIC REPORTS 2015年第1期5卷 1-9页

作者： Song, Zeming Wang, Xu Lv, Cheng An, Yonghao Liang, Mengbing Ma, Teng He, David Zheng, Ying-Jie Huang, Shi-Qing Yu, Hongyu Jiang, Hanqing Arizona State Univ Sch Engn Matter Transport & Energy Tempe AZ 85287 USA Desert Vista High Sch Phoenix AZ 85048 USA Jinan Univ MOE Key Lab Disaster Forecast & Control Engn Guangzhou 510632 Guangdong Peoples R China Arizona State Univ Sch Elect Comp & Energy Engn Tempe AZ 85287 USA Arizona State Univ Sch Earth & Space Explorat Tempe AZ 85287 USA

We have produced stretchable lithium-ion batteries (LIBs) using the concept of kirigami, i.e., a combination of folding and cutting. The designated kirigami patterns have been discovered and implemented to achieve great stretchability (over 150%) to LIBs that are produced by standardized battery manufacturing. It is shown that fracture due to cutting and folding is suppressed by plastic rolling, which provides kirigami LIBs excellent electrochemical and mechanical characteristics. The kirigami LIBs have demonstrated the capability to be integrated and power a smart watch, which may disruptively impact the field of wearable electronics by offering extra physical and functionality design spaces.

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Analysis of residual stress in fiber reinforced composite using cohesive zone model

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Cailiao Rechuli Xuebao/Transactions of Materials and Heat Treatment 2014年第12期35卷 216-221页

作者： Zhao, Yu-Ping Yuan, Hong Han, Jun Yang, Xiong-Fei MOE Key Laboratory of Disaster Forecast and Control in Engineering Institute of Applied Mechanics Jinan University Guangzhou China Department of Engineering Mechanics Hunan University of Science and Technology Xiangtan China

The residual stress in the single fiber/polymer matrix composite after high temperature curing was investigated using analytical method. The elastic-softening cohesive zone model for the interface was used. The results indicate that the higher curing temperature causes softening and debonding along the interface. The residual stress in the fiber consists of building-up and plateau regions. The residual stress in the plateau region is proportional to the curing temperature and the thermal expansion coefficient difference between fiber and matrix. The interfacial parameter has only influence on the residual stress in the building-up region. Under the same value of interface fracture toughness, the increase of interfacial elastic modulus shortens the stress transfer length, the increase of softening modulus decreases the softening length, and the temperature which leads to the initial interface debonding is not affected by the change of interfacial elastic and softening modulus. ©, 2014, Editorial Office of Transactions of Materials and Heat Treatment. All right reserved.

关键词： Residual stresses

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MACRO-MICRO ANALYSIS FOR ANTI-PENETRATING POSTBUCKLING OF FIBER REINFORCED, DEBONED LAMINATES WITH CONTACT EFFECTS

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INTERNATIONAL JOURNAL OF APPLIED MECHANICS 2014年第4期6卷

作者： Tang, Mingqiao Xue, Jianghong Yuan, Hong Liu, Renhuai Jinan Univ Dept Mech & Civil Engn Key Lab Disaster Forecast & Control Engn Minist Educ Guangzhou 510632 Guangdong Peoples R China

This paper presents a close-form solution for the anti-penetrating postbuckling problem of fiber reinforced, rectangular laminates. The laminate has a through-width debonded region buried at the center position and is simply supported at its four edges subjected to the in-plane compressive load. Based on the previous analysis of the contact kinematics from micro mechanics of composite material, the nonlinear contact effects at the interfaces of the debonded region are considered and characterized by a contact factor. Governing equations are established and are solved using the perturbation approach. Asymptotic solutions from perturbation analysis are presented. It is found that for fiber reinforced, debonded laminates the postbuckling deformation involves global deflection and local buckling with amplitude of the global one 104 times larger than the local one. The global deflection is induced by the postbuckling load and the local buckling is caused by the anti-penetrating contact effects. Due to the contact effects, the load carry capacity of the delaminated laminate is tremendously enhanced. Further examination indicates that both the buckling load and the contact performances are intrinsic properties of the laminates. Parametric analyses show that (i) the buckling load decreases with the increasing of the delamination length and the delamination depth and is very sensitive to the changing of the aspect ratio, (ii) the contact performances, including the location and size of the contact areas, rely only on the geometries of the debonded region and the material properties but are hardly affected by the aspect ratio. The analysis is in effect by comparing with the well established results.

关键词： Macro-micro analyses delamination contact effect perturbation approach anti-penetrating postbuckling

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Analysis of influence factors about gas dynamic disaster in northwest wing of Kaiping syncline

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Electronic Journal of Geotechnical engineering 2014年第Z2期19卷 10017-10025页

作者： Qi, Li-Ming Ge, Xu-Bin Rong, Zhao Key Lab of Mine Disaster Prevention and Control in Hebei Province Langfang Hebei China School of Safety Engineering North China Institute of Science and Technology Beijing China Graduate School North China Institute of Science and Technology Beijing China

In Northwest wing of Kaiping syncline, gas dynamic disasters seriously threaten the safety production of coal mine. This paper first introduces geological structure character of syncline in Kaiping Mine and influence factors of gas dynamic disaster. Then, the records about gas dynamic disasters (46 times) which occurred in Northwest wing of Kaiping syncline over the years, are collected, arranged and quantified. Last, the weight of influence factors of gas dynamic disasters is analyzed by employing neural network, giving the result about the weight of different influence factors. The study shows that: in Northwest wing of Kaiping syncline, the region which is mined in deep, or has more complex geological conditions or compact roof and floor is the key of gas dynamic disaster prevention, and the protective layer mining is the most effective method of gas dynamic disaster prevention. © 2014 ejge.

关键词： disaster prevention

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Experimental Research on Creep Characteristics of Nansha Soft Soil

SCIENTIFIC WORLD JOURNAL

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SCIENTIFIC WORLD JOURNAL 2014年第1期2014卷 968738页

作者： Luo, Qingzi Chen, Xiaoping Jinan Univ Coll Sci & Engn MOE Key Lab Disaster Forecast & Control Engn Guangzhou 510632 Guangdong Peoples R China

A series of tests were performed to investigate the creep characteristics of soil in interactive marine and terrestrial deposit of Pearl River Delta. The secondary consolidation test results show that the influence of consolidation pressure on coefficient of secondary consolidation is conditional, which is decided by the consolidation state. The ratio of coefficient of secondary consolidation and coefficient of compressibility (C-a/C-c) is almost a constant, and the value is 0.03. In the shear-box test, the direct sheer creep failure of soil is mainly controlled by shear stress rather than the accumulation of shear strain. The triaxial creep features are closely associated with the drainage conditions, and consolidation can weaken the effect of creep. When the soft soil has triaxial creep damage, the strain rate will increase sharply.

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