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CRITERION FOR JUDGING SATISFACTION OF CONSISTENCY CONDITIONS IN RATE-DEPENDENT CONSTITUTIVE RELATIONS

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Acta Mechanica Solida Sinica 1999年第4期12卷 356-364页

作者： Wang Zhe (College of civil Engineering and architecture,Northern Jiaotong University,Beijing 100044,China) Coll. of Civ. Eng. and architecture Northern Jiaotong University Beijing 100044 China

Based on irreversible thermodynamics, the criterion for judging the satisfaction of consistency conditions in rate-dependent constitutive relationship is deduced by introducing four basic hypotheses. Formulas for solving internal variables are given. It makes the rate-dependent model applicable no matter whether the consistency conditions can be satisfied or not.

关键词： rate-dependent constitutive relations consistency condition irreversible thermodynamics

MOLECULAR DYNAMICS SIMULATION OF INTERFACIAL DEFECTS WITH MODIFIED POTENTIAL BASED ON THE FIRST-PRINCIPLE

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Acta Mechanica Solida Sinica 2010年第5期23卷 400-406页

作者： Dongwei Ren Jinquan Xu 1(School of Naval architecture and civil Engineering,Shanghai Jiaotong University,Shanghai 200240,China) School of Naval architecture and civil Engineering Shanghai Jiaotong University Shanghai China

The interfacial molecular structure of materials with different lattice constants is simulated by using the method of molecular dynamics （MD）. Potential of modified analytical embedded atom method （MAEAM） is used for nominterfacial atoms. To simulate the state of interracial atoms, further modifications are applied to the MAEAM potential based on the first- principle simulation results. It is concluded that a small change of potential may greatly influence the interfacial molecular structure. Void and diffusions can be observed in the simulation results. It is also found that the pre-existed dot defects before bonding can decrease the number of interfacial defects greatly, thereby, can increase the strength of the interface.

关键词： molecular dynamics interface defect potential first-principle

3D time-domain regular grid infinite element in elastic foundation

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Science China(Technological Sciences) 2010年第5期53卷 1413-1423页

作者： YAN XiShui,YE HuiFei,ZHAO YongQian & GE Wei College of civil Engineering and architecture,Zhejiang University,Hangzhou 310058,China College of civil Engineering and architecture Zhejiang University

The normal dynamic infinite element in elastic foundation cannot be used in time-domain due to it's inclusive frequency term.A novel 3D regular grid infinite element is constructed to deal with the time-domain *** new infinite element method can easily transform the frequency terms of mass matrix and stiffness matrix to the terms in higher-order dynamic equation,thus a higher-order dynamic equilibrium equation is *** on the second-order Wilson-θ dynamic equation,a new time-domain numeric formula of higher-order dynamic equation is deduced,and the time-domain calculation coupling with finite element and infinite element can be *** classic 3D fluctuation problem in elastic foundation is employed as an illustrative example to investigate the accuracy and validity of this new infinite *** result indicates that the new dynamic infinite element has a high accuracy.

关键词： infinite element 3D time domain elastic foundation regular grid

Research of Environment-friendly Low Emissivity Glass

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Journal of Wuhan University of Technology(Materials Science) 2007年第2期22卷 385-387页

作者：余峰 School of civil Engineering and architecture Wuhan University of Technology

The environment-friendly glasses which integrate function and structure were introduced, among these glasses can save energy very efficiently due to its low infrared emissivity. The fundamental principle of the low emissivity glass and the research progress of this kind glass were analyzed. Meanwhile, high performance and low applied development trend of emissivity glass were reviewed.

关键词： low emissivity glass(Low-E) environment-friendly research progress development trend

Optimization of Regulation Valve Location for Heating System

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湖南大学学报（自然科学版） 2009年第S1期36卷 88-90页

作者： LIU Ling-ling,CHEN Hong-bing,LI De-ying(School of Environment and Energy Engineering,Beijing University of civil Engineering and architecture,Beijing 100044,China) School of Environment and Energy Engineering Beijing University of Civil Engineering and Architecture Beijing 100044 China

This paper mainly studied how to determine the best location of the self-operated flow control valve at the heating system *** the location of regulating valve directly affects the pipe network performance,the simulation and analysis of pressure change in heating system was carried out with Computational Fluid Dynamics(CFD)*** study shows the best location of regulating valve varies with the change of the supply and return pipe length when the heating area of each user is small,and when the heating area of each user is large(2 000 000～3 000 000 m2),the best location is on the supply pipe.

关键词： regulating valve optimization CFD simulation

Managing Soil Erosion Potential by Integrating Digital Elevation Models with the Southern China's Revised Universal Soil Loss Equation——A Case Study for the West Lake Scenic Spots Area of Hangzhou,China

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Journal of Mountain Science 2007年第3期4卷 237-247页

作者： WANG Weiwu College of civil engineering and architecture Zijinggang Campus Zhefiang University Hangzhou 310058 China

In China, many scenic and tourism areas are suffering from the urbanization that results from physical development of tourism projects, leading to the removal of the vegetative cover, the creation of areas impermeable to water, in-stream modifications, and other problems. In this paper, the risk of soil erosion and its ecological risks in the West Lake Scenic Spots （WLSS） area were quantitatively evaluated by integrating the revised universal soil loss equation （RUSLE） with a digital elevation model （DEM） and geographical information system （GIS） software. The standard RUSLE factors were modified to account for local climatic and topographic characteristics reflected in the DEM maps, and for the soil types and vegetation cover types. An interface was created between the Areinfo software and RUSLE so that the level of soil erosion and its ecological risk in the WLSS area could be mapped immediately once the model factors were defined for the area. The results from an analysis using the Areinfo-RUSLE interface showed that the risk value in 93 % of the expanding western part of the WLSS area was moderate or more severe and the soil erosion risk in this area was thus large compared with that in the rest of the area. This paper mainly aimed to increase the awareness of the soil erosion risk in urbanizing areas and suggest that the local governments should consider the probable ecological risk resulting from soil erosion when enlarging and developing tourism areas.

关键词： West Lake Scenic Spots RUSLE model modification GIS digital elevation model ecological risk of soil erosion China

A SIMPLE AND PRECISE FORMULA OF STRENGTH

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Science in China,Ser.A 1988年第10期31卷 1255-1262页

作者：高万章 Beijing Institute of civil Engineering and architecture

The three stress components, equivalent to the principal stresses and independent of each other, have been obtained by means of reasonably resolving the stress tensor, with which the limiting state of materials are analyzed. A general formula of strength suitable for the isotropic materials has been derived and the problem of strength analysis finally solved.

关键词： pure shear slipping line formula strength.

A note on the derivation of the derivatives of invariants of stretch tensor to the right Cauchy-Green tensor

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Progress in Natural Science:Materials International 2006年第1期16卷 96-99页

作者： TIAN Dongyan, JIN Ming and DUI Guansuo (Institute of Engineering Mechanics, School of civil Engineering and architecture, Beijing Jiaotong University, Beijing 100044, China) Institute of Engineering Mechanics School of Civil Engineering and Architecture Beijing Jiaotong University Beijing 100044 China

A new approach for the derivation of the principal invariants of the stretch tensor with respect to the right Cauchy- Green tensor is presented in this paper. According to the definition of the derivation of tensor function, the three first-order derivatives for the principal invariants of the stretch tensor are obtained through derivation directly to the right Cauchy-Green tensor by incremental method. Then the three second-order derivatives are yielded by the derivation to the right Cauchy-Green strain tensor directly. Furthermore, an explicit expression of the tangent modulus of the general Varga material is given as an example.

关键词： continuum mechanics invariant strain energy tangent modulus.

Asbestos Tailings as Aggregates for Asphalt Mixture

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Journal of Wuhan University of Technology(Materials Science) 2011年第2期26卷 336-339页

作者：刘小明 School of civil Engineering and architecture Central South University

To use many asbestos tailings collected in Ya-Lu highway,and to explore the feasibility of using asbestos tailings as aggregates in common asphalt mixtures,and properties of some asphalt mixtures were evaluated as well.X-ray diffraction （XRD）,X-ray fluorescent （XRF）,and atomic absorption spectrophotometry （AAS） were employed to determine the solid waste content of copper,zinc,lead,and *** properties and pavement performances of AC-25 asphalt mixture with asbestos tailings were also evaluated compared with those with basalt as *** and XRF measurement results infer that asbestos tailing is an excellent road *** properties of AC-25 asphalt mixture with asbestos tailings satisfied the related *** heavy metals and toxic pollution were detected in AAS test and the value of pH test is 8.23,which is help to the adhesion with asphalt in the asphalt *** compared with basalt,high temperature property and the resistance to low temperature cracking of AC-25 asphalt mixture was improved by using asbestos tailings as ***-service AC-25 asphalt pavement with asbestos tailings also presented excellent performance and British Pendulum Number （BPN） coefficient of surface.

关键词： asbestos tailings aggregate recycling and use asphalt mixture pavement performances