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Science Bulletin 2005年第24期50卷 2793-2799页

作者： ZHANG Hongwu & QIN Jianmin state key laboratory of structural analysis and Industrial equipment Dalian University of Technology, Dalian 116024, china state key laboratory of structural analysis and Industrial equipment Dalian University of Technology Dalian China

This paper analyzes the interaction between two kinds of internal length scales when the rate dependen plasticity is introduced to a multiphase material model to study the dynamic strain localization phenomenon of satu rated and partially saturated porous media. The stability analysis demonstrates that the enhanced porous media mode preserves the well-posedness of the initial value problem for both axial and shear waves because an internal length scale parameter is introduced in the visco-plasticity model. On the other hand, the interaction between the length scale intro duced by the rate dependent model and that naturally con tained in the governing equations of fully and partially satu rated model will take place. A basic method is presented to investigate the internal length scale of the multiphase porou media under the interaction of these two kinds of length scale parameters. Material stability analysis is carried out for a certain permeability from which the results of wave number domain with real wave speed are distinguished. A one dimen sional example is given to illustrate the theoretical findings.

关键词： strain localization porous material rate dependent plas ticity internal length scale.

NONLINEAR BUcKLING BEHAVIOR OF DAMAGED cOMPOSITE SANDWIcH PLATES cONSIDERING THE EFFEcT OF TEMPERATURE-DEPENDENT THERMAL AND MEcHANIcAL PROPERTIES

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Acta Mechanica Solida Sinica 2001年第2期14卷 155-160页

作者： Bai Ruixiang chen Haoran (state key laboratory of structural analysis for Industrial equipment, Dalian University of Technology, Dalian 116024, china) Stt. key Lab. of Struct. A. Dalian University of Technology Dalian 116024 China

On the basis of the first-order shear deformation plate theory andthe zig-zag deformation as- sumption, an incremental finite elementformulation for nonlinear buckling analysis of the composite sandwichplate is deduced and the temperature-dependent thermal and mechanicalproperties of composite is consid- ered. A finite element method forthermal or thermo-mechanical coupling nonlinear buckling analysis ofthe composite sandwich plate with an interfacial crack damage betweenface and core is also developed.

关键词： composite sandwich plate interfacial crack damage nonlinear thermalbuckling behavior

The optimization model of the heat conduction structure

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Progress in Natural Science:Materials International 2008年第6期18卷 665-670页

作者： Yongcun Zhang,Shutian Liu* state key laboratory of structural analysis for Industrial equipment,Department of Engineering Mechanics,Dalian University of Technology,Dalian 116024,china state key laboratory of structural analysis for Industrial equipment Department of Engineering Mechanics Dalian University of Technology Dalian 116024 China

An optimization model considering a novel thermal performance index to be the objective function is proposed for minimizing the highest temperature in this ***,the performance of the conventional heat conduction optimization model,with the dissipation of heat transport potential capacity as the objective function,is evaluated by a one-dimensional heat conduction problem in a planar plate ***,a new thermal performance index,named the geometric average temperature,is *** new heat con-duction optimization model,with the geometric average temperature as the objective function,is developed and the corresponding finite element formula is *** results show that the geometric average temperature is an ideal thermal performance index and the solution of the new model is close to the theoretical optimal solution.

关键词： Optimization Heat conduction structure Dissipation of heat transport potential capacity Geometric average temperature Planar plate exchanger

Multi-symplectic method to analyze the mixed state of Ⅱ-superconductors

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Science china(Physics,Mechanics & Astronomy) 2008年第12期51卷 1835-1844页

作者： HU WeiPeng1↑ & DENG Zichen1,2 1 School of Mechanics, civil Engineering and Architecture, Northwestern Polytechnical University, Xi’an 710072, china 2 state key laboratory of structural analysis of Industrial equipment, Dalian University of Technology, Dalian 116023, china School of Mechanics Civil Engineering and Architecture Northwestern Polytechnical University Xi’an China state key laboratory of structural analysis of Industrial equipment Dalian University of Technology Dalian China

The mixed state of two-band II-superconductor is analyzed by the multi-symplectic method. As to the Ginzburg-Landau equation depending on time that describes the mixed state of two-band II-superconductor, the multi-symplectic formulations with several conservation laws: a multi-symplectic conservation law, an energy con- servation law, as well as a momentum conservation law, are presented firstly; then an eighteen points scheme is constructed to simulate the multi-symplectic partial differential equations (PDEs) that are derived from the Ginzburg-Landau equation; finally, based on the simulation results, the volt-ampere characteristic curves are obtained, as well as the relationships between the temperature and resistivity of a suppositional two-band II-superconductor model under different magnetic intensi- ties. From the results of the numerical experiments, it is concluded that the notable property of the mixed state of the two-band II-superconductor is that: The trans- formation temperature decreases and the resistivity ρ increases rapidly with the increase of the magnetic intensity B. In addition, the simulation results show that the multi-symplectic method has two remarkable advantages: high accuracy and excellent long-time numerical behavior.

关键词： two-band Ginzburg-Landau equation mixed state multi-symplectic conservation law

Recent development in structural design and optimization

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Acta Mechanica Sinica 2010年第6期26卷 807-823页

作者： Xu Guo·Geng-Dong cheng state key laboratory of structural analysis for Industrial equipment,Department of Engineering Mechanics,Dalian University of Technology, Dalian 116023,china state key laboratory of structural analysis for Industrial equipment Department of Engineering Mechanics Dalian University of Technology Dalian China

With the fast development of computational mechanics and the capacity as well as the speed of modern computers,simulation-based structural optimization has become an indispensable tool in the design process of competitive *** paper presents a brief description of the current status of structural optimization by reviewing some significant progress made in the last *** research topics are also *** entire literatures of the field are not covered due to the limitation of the length of *** scope of this review is limited and closely related to the authors＇ own research interests.

关键词： structural optimization Multi-scale Uncertainty Multi-physics Software

Numerical simulations of self-propelled swimming of 3D bionic fish school

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Science china(Technological Sciences) 2009年第3期52卷 658-669页

作者： WU chuiJie1 & WANG Liang2 1 state key laboratory of structural analysis for Industrial equipment, Dalian University of Technology, Dalian 116024, china 2 Research center for Fluid Dynamics, People’s Liberation Army University of Science and Technology, Nanjing 211101, china state key laboratory of structural analysis for Industrial equipment Dalian University of Technology Dalian China Research center for Fluid Dynamics People’s Liberation Army University of Science and Technology Nanjing China

Numerical simulations of self-propelled swimming of a three dimensional bionic fish and fish school in a viscous fluid are carried out. This is done with the assistance of a parallel software package produced for 3D moving boundary problems. This computational fluid dynamics package combines the adaptive multi-grid finite volume method, the immersed boundary method and VOF (volume of fluid) method. By using the package results of the self-propelled swimming of a 3D bionic fish and fish school in a vis- cous fluid are obtained. With comparison to the existing experimental measurements of living fishes, the predicted structure of vortical wakes is in good agreement with the measurements.

关键词： adaptive multi-grid immersed boundary method self-propelled swimming fish school 3D bionic fish

NUMERIcAL PREDIcTION OF FATIGUE DAMAGE IN STEEL cATENARY RISER DUE TO VORTEX-INDUcED VIBRATION

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Journal of Hydrodynamics 2011年第2期23卷 154-163页

作者： GAO Yun ZONG Zhi SUN Lei state key laboratory of structural analysis for Industrial equipment and Department of Naval Architecture and Faculty of Vehicle Engineering and Mechanics Dalian University of Technology Dalian 116024 China state key laboratory of structural analysis for Industrial equipment Dalian University of Technology Dalian116024 China Faculty of Vehicle Engineering and Mechanics Dalian University of Technology Dalian 116024 China

For studying the characteristics of Steel catenary Riser （ScR）, a simplified pinned-pinned cable model of vibration is established. The natural frequencies, the normalized mode shapes and mode curvatures of the ScR are calculated. The fatigue damage of the ScR can be obtained by applying the modal superposition method combined with the parameters of S -N curve. For analyzing the relation between the current velocity and the ScR＇s fatigue damage induced by the vortex-induced vibration, ten different current states are evaluated. Then, some useful conclusions are drawn, especially an important phenomenon is revealed that the maximum fatigue damage in the riser usually occurs near the area of the boundary ends.

关键词： vortex-induced vibration Steel catenary Riser (ScR) fatigue damage modal superposition method

Functions for patch test in finite element analysis of the Mindlin plate and the thin cylindrical shell

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Science china(Physics,Mechanics & Astronomy) 2009年第5期52卷 762-767页

作者： cHEN WanJi 1,2 ,WANG JinZhi 1,3 &ZHAO Jie 1 1state key laboratory for structural analysis of Industrial equipment,Dalian University of Technology,Dalian 116023,china 2Institute for structural analysis of Aerocraft,Shenyang Institute of Aeronautical Engineering,Shenyang 110136,china 3 college of Science,Institute of Dalian Nationalities,Dalian 116022,china state key laboratory for structural analysis of Industrial equipment Dalian University of Technology Dalian China Institute for structural analysis of Aerocraft Shenyang Institute of Aeronautical Engineering Shenyang China college of Science Institute of Dalian Nationalities Dalian China

current patch test for Mindlin plate element only satisfies the zero shear deformation *** patch test of non-zero constant shear for Mindlin plate problem cannot be *** shell element, the patch test does not even *** on the theory of enhanced patch test proposed by chen W J (2006),the authors proposed the enhanced patch test function for Mindlin plate and thin cylindrical shell *** enhanced patch test function can be used to assess the convergence of the Mindlin plate and cylindrical thin shell elements.

关键词： Mindlin plate thin cylindrical shell finite element enhanced patch test test function

A method of constructing a database-free optimal dynamical system and a global optimal dynamical system

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Science china(Physics,Mechanics & Astronomy) 2008年第7期51卷 905-915页

作者： WU chuiJie1? & WANG Liang2 1 state key laboratory of structural analysis for Industrial equipment, Dalian University of Technology, Dalian 116024, china 2 Research center for Fluid Dynamics, School of Science, PLA University of Science and Technology, Nanjing 211101, china state key laboratory of structural analysis for Industrial equipment Dalian University of Technology Dalian China Research center for Fluid Dynamics School of Science PLA University of Science and Technology Nanjing China

In this paper, to overcome the drawbacks of POT which minimize the reminder, not only the optimal functional with minimal residual is put forward, but also the method of global optimization is used. Under the condition of large reminder, the optimal bases can also be obtained through the method of POTres without the approaching of initial conditions. In addition, compared with local optimization, the advantage of global optimization is remarkable. On the one hand, we can expect that the dynamical system based on the global optimal bases will include more information than the ones based on the local optimal bases, since the global optimal bases are much more precise than the local optimal bases. On the other hand, from the point of view of error, the global optimal bases are independent of the choice of the object functional and the initial bases.

关键词： dynamical system residual global optimization