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| 1 | Study on generalized magneto-thermoelastic problems by FEM in time domain显示文摘This paper presents an investigation of temperature, displacement, stress, and induced magnetic field in a half space perfectly-conductive plate. Finite element equations regarding generalized magneto-thermoelasticity problems with two relaxation times (i.e., the G-L theory) are derived using the principle of virtual work. For avoiding numerical complication involved in inverse Laplace and Fourier transformation and low precision thereof, the equations are solved directly in time-domain. As a numerical example, the derived equation is used to investigate the generalized magneto-thermoelastic behavior of a semi-infinite plate under magnetic field and subjecting to a thermal shock loading. The results demonstrate that FEM can faithfully predict the deformation of the plate and the induced magnetic field, and most importantly can reveal the sophisticated second sound effect of heat conduction in two-dimensional generalized thermo elastic solids, which is usually difficult to model by routine transformation methods. A peak can be observed in the distribution of stress and induced magnetic field at the heat wave front and the magnitude of the peak decreases with time, which can not be obtained by transformation methods. The new method can also be used to study generalized piezo-thermoelastic problems. | Xiaogeng Tian Yapeng Shen | 2005 | Acta Mechanica Sinica2005，21，4： | 10 |
| 2 | VARIATIONAL PRINCIPLFS OF NONLINEAR PIEZOTHERMOELASTIC MEDIA显示文摘Through the phenomenological approach,the nonlinear constitutive equations couplingthe electro/magnetic therrnoelastic media are derived.Several nonlinear variational principles forpiezothermoelastic continua are presented and employed to formulate the incremental variational princi-ples which are of important significance in practical applications such as the nonlinear finite elementanalysis,the buckling,postbuckling and dynamic stability analyses of piezoelectric smart structures. | Chen Changqing Shen Yapeng Tian Xiaogeng (Department of Engineering Mechanics,Xi’an Jiaotong University,Xi’an 710049,China) | 1998 | Acta Mechanica Solida Sinica1998，11，1： | 4 |
| 3 | FINITE ELEMENT ANALYSIS OF THERMOELASTIC BEHAVIOR OF PIEZOELECTRIC STRUCTURES UNDER FINITE DEFORMATION显示文摘It is noted that the behavior of most piezoelectric materials is temperature dependent and suchpiezo-thermo-elastic coupling phenomenon has become even more pronounced in the case of finite deforma-tion.On the other hand,for the purpose of precise shape and vibration control of piezoelectric smart struc-tures,their deformation under external excitation must be ideally modeled.This demands a thorough study ofthe coupled piezo-thermo-elastic response under finite deformation.In this study,the governing equations ofpiezoelectric stractures are formulated through the theory of virtual displacement principle and a finite elementmethod is developed,it should be emphasized that in the finite element method the fully coupled piezo-ther-mo-elastic behavior and the geometric non-linearity ate considered.The method developed is then applied tosimulate the dynamic and steady response of a clamped plate to heat flux acting on one side of the plate tomimic the behavior of a battery plate of satellite irradiated under the sun.The results obtained are comparedagainst classical solutions,whereby the thermal conductivity is assumed to be independent of deformation.Itis found that the full-cnupled theory predicts less transient response of the temperature compared to the clas-sic analysis.In the steady state limit,the predicted temperature distribution within the plate for small heatflux is almost the same for both analyses.However,it is noted that increasing the heat flux will increase thedeviation between the predictions of the temperature distributinn by the full coupled theory and by the classicanalysis.It is concluded from the present study that,in order to precisely predict the deformation of smartstructures,the piezo-thermo-elastic coupling,geometric nou-linearity and the deformation dependent thermalconductivity should be taken into account. | Tian Xiaogeng Shen Yapeng | 2002 | Acta Mechanica Solida Sinica2002，15，4： | 3 |
| 4 | A direct finite element method study of general- ized thermoelastic problems 显示文摘 | TIAN Xiaogeng SHEN Yapeng CHEN Changqing | 2006 | International Journal of Solids and Structures2006，43，78： | 1 |
| 5 | Optimal design of piezoelec- tric actuators for plate vibroacoustic control usinggenetic algo- rithms with immune diversity 显示文摘 | Gao Feng Shen Yapeng Li Luxian | 2000 | Smart Materials and Struc- tures2000，，： | 1 |
| 6 | Semi -active control of structures incorporated with magnetorheological dampers using neural networks 显示文摘 | Xu Zhaodong Shen Yapeng Guo Yingqing | 2003 | Smart Materials and Structures2003，12，1： | 1 |
| 7 | Micromechanics of composites reinforced in the aligned SMA short fibers in uniform thermal fields 显示文摘 | Wang Jian Shen Yapeng | 2000 | Smart Materials and Structures2000，9，1： | 1 |
| 8 | Studying the thermomechanical behavior of SM composites with aligned SMA short fibers by micromechanical approaches 显示文摘 | Wang Jian Sze K Y Shen Yapeng | 2001 | Smart Materials and Structures2001，10，5： | 1 |
| 9 | A generalized electromagneto-thermoelastic problem for an infinitely long solid cylinder 显示文摘 | He Tianhu Tian Xiaogeng Shen Yapeng | 2005 | European Journal of Mechanics A/Solids2005，24，： | 1 |
| 10 | THERMOMECHANICAL RESPONSE OF SMA FIBER COMPOSITES WITH NON-UNIFORM TEMPERATURE DISTRIBUTION显示文摘A micromechanics method based on the High-Order-Theory developed by Aboudi et al. is used to predict the thermomechanical response of composites reinforced by shape memory alloy (SMA) fibers, and the non-uniform thermal distribution in composite arising from the process of heating or cooling is considered. The numerical development based on this model was coded to predict the thermomechanical response of shape memory alloy fiber/elastomer matrix composite subjected to thermal cycle loading. When the composite is heated, two heating ways, thermal gradients and heat source by passing an electric current through the SMA fibers are imposed on the composite respectively. Upon cooling, the first thermal boundary condition and the second thermal boundary condition are subjected to the composite respectively. A series of stress distributions and temperature distributions for different instants are calculated to reveal the interaction between the SMA material and matrix. It is useful to analyze and design the SMA actuator driven by heat source or the surface temperature. | Zhang Zhen Wang Jian Shen Yapeng (The State Key Laboratory of Mechanical Structural and Vibration,Xi’an Jiaotong University,Xi’an 710049,China) | 2003 | Acta Mechanica Solida Sinica2003，16，4： | 1 |
| 11 | The general solution of three-dimensional problems in magnetoeletroelastic media显示文摘 | Wang Xu Shen Yapeng | 2002 | Int J Engineering Science2002，40，10： | 1 |
| 12 | DYNAMIC RESPONSE OF TWO-DIMENSIONAL GENERALIZED THERMOELASTIC COUPLING PROBLEM SUBJECTED TO A MOVING HEAT SOURCE显示文摘Based on the Lord and Shulman generalized thermoelasticity theory with one relaxation time, an isotropic semi-infinite plate subjected to a moving heat source has been studied by employing the finite element method directly in time domain, whose distributions of nondimensional temperature, displacement and stress are illustrated graphically. The results show that the present method is an effective and exact numerical one for solving the thermoelastic coupling problem and is capable of overcoming the defects of traditional integrated transformation and inverse integrated transformation methods. At the same time, the temperature step of the thermal wave front is obtained exactly in contrast with conventional numerical transformation methods. | Ronghou Xia Xiaogeng Tian Yapeng Shen | 2014 | Acta Mechanica Solida Sinica2014，27，3： | 1 |
| 13 | ARC INTERFACE CRACK IN A THREE-PHASE PIEZOELECTRIC COMPOSITE CONSTITUTIVE MODEL显示文摘An in-depth investigation is made on the problem of an arc-shaped interface insulating crack in a three-phase concentric circular cylindrical piezoelectric composite constitutive model. An exact solution in series form is derived by employing the complex variable method. In addition, the distribution of physical quantities such as stresses, strains, electric displacements and electric fields in the whole field and along the interface is also presented. Explicit expressions for crack opening displacement, jump in electro potential on the crack surface and the electro-elastic field intensity factors at the crack tips are obtained. Specific calculations demonstrate that the convergence of the series form solution is satisfactory and that the outer phase ( composite phase) will exert a significant effect on the electro-mechanical coupling response of the composite system. Owing to the fact that stresses and electric displacements still possess conventional inverse square root singularities, the oscillating singularities near the crack tip under plane strain conditions will be absent and, as a result, no unphysical interpenetration phenomenon of the two crack surfaces will occur. In conclusion, the elastic solution obtained is also based on a solid physical foundation. | Wang Xu Shen Yapeng (Department of Engineering Mechanics, Xi’an Jiaotong University,Xi’an 710049, China) | 2001 | Acta Mechanica Solida Sinica2001，14，2： | 0 |
| 14 | GREEN'S FUNCTIONS FOR ANISOTROPIC PIEZOELECTRIC BIMATERIALS WITH A SLIPPING INTERFACE显示文摘An explicit full-field expression of the Green’s functions for anisotropic piezoeleetric bimateri-als with a slipping interface is derived.When the electro-elastic singularity reduces to a pray dislocation indisplacement and electric potential,interaction energy,between the dislocation and the bimaterials is obtainedexplicitly while the generalized force on the disloeation is given in a real form whieh is also valid for degener-ate materials.The investigation demonstrates that the houndary conditions at lhe slipping interface betweentwo piezoelectric materials will exert a prominent influence on the mobility of the dislocation. | Wang Xu Shen Yapeng Du Jianke (Department of Engineering Mechanics,Xi’an,Jiaotong University,Xi’an 710049,China) | 2001 | Acta Mechanica Solida Sinica2001，14，3： | 0 |
| 15 | EXPERIMENTAL AND NUMERICAL STUDIES ON PERFORMANCE OF MACRO FIBER COMPOSITES FOR BEAM TWISTING APPLICATIONS显示文摘This paper presents the use of macro-fiber composites (MFC) as actuators for twisting control of pre-twisted beams, which is one efficient method of vibration suppression techniques of helicopter rotors. An MFC is a piezoelectric fiber composite which has an interdigitated electrode, rectangular cross-section and unidirectional piezoceramic (PZT) fibers embedded in the polymer matrix. An MFC actuator has much higher actuation performance, flexibility and durability than a traditional piezoceramic (PZT) actuator. This study showed that an MFC could be used as an actuator to change the displacement and twist tip-angle of a pre-twisted beam. In the test, an MFC patch was pasted on the beam's upper surface to twist the pre-twisted beam actively. Different twist tip-angle changes of the pre-twisted beam were measured under a series of actuation voltages, and a good agreement was observed when experimental results were compared with numerical results. In addition, the actuation performance of MFC was compared with those of PZT4 and PVDF and the influence of anisotropic property of the MFC on its actuation performance was also studied. The experimental and numerical results presented in this paper show the potential of MFC for use in the vibration control of helicopter rotors. | Hongyan Zhang 1 Yapeng Shen 2 ( 1 Chang’an University, School of Science, The key Laboratory of Pavement Materials of Ministry of Education, Xi’an 710064, China) ( 2 Xi’an Jiaotong University, School of Aerospace, Xi’an 710049, China) | 2011 | Acta Mechanica Solida Sinica2011，24，S1： | 0 |
| 16 | A micromechanics-based finite element model for the constitutive behavior of polycrystalline ferromagnets显示文摘为多晶的铁磁物质的组成的行为的一个基于 micromechanics 的有限元素模型被开发。在模型,多晶的固体被假定与随机分布式的结晶的取向包括众多的单个晶体,并且接着,单个晶体由铁磁性的领域,其各个被一个立方的元素代表组成。领域的偶极子方向随机被分配模仿铁磁性的多晶体的结晶的性质。为领域的一个切换的标准在显微镜的水平被指定。宏观的组成的行为被平均每个领域的显微镜 / 本地的行为获得。发达模型被用于铁磁性的材料的模拟。与采用的适当材料参数,紧张的预言的磁性的正式就职对磁场对磁场的磁滞现象环被显示与试验性的观察同意很好。 | Binglei Wang Changqing Chen Yapeng Shen | 2006 | Acta Mechanica Sinica2006，22，3： | 0 |
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