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| 1 | Functions for patch test in finite element analysis of the Mindlin plate and the thin cylindrical shell显示文摘Current patch test for Mindlin plate element only satisfies the zero shear deformation condition.The patch test of non-zero constant shear for Mindlin plate problem cannot be performed.For shell element, the patch test does not even exist.Based 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 elements.This enhanced patch test function can be used to assess the convergence of the Mindlin plate and cylindrical thin shell elements. | 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 | 2009 | Science China(Physics,Mechanics & Astronomy)2009，52，5： | 2 |
| 2 | A size-dependent composite laminated skew plate model based on a new modified couple stress theory显示文摘In this study, a size-dependent composite laminated skew Mindlin plate model is proposed based on a new modified couple stress theory. This plate model can be viewed as a simplified couple stress theory in engineering mechanics. Governing equations and related boundary conditions are derived based on the principle of minimum potential energy. The Rayleigh–Ritz method is employed to obtain the numerical solutions of the center deflections of simply supported plates with different ply orientations. Numerical results show that the normalized center deflections obtained by the proposed model are always smaller than those obtained by the classical one, i.e. the present model can capture the scale effects of microstructures. Moreover, a phenomenon reveals that the ply orientation would make a significant influence on the magnitude of scale effects of composite laminated plates at micro scale. Additionally, the present model of thick skew plate can be degenerated to the model of Kirchhoff plate based on the modified couple stress theory by adopting the assumptions in Bernoulli–Euler beam and material isotropy. | Dan He Wanli Yang Wanji Chen | 2017 | Acta Mechanica Solida Sinica2017，30，1： | 2 |
| 3 | Enhanced patch test of finite element methods显示文摘Theoretically, the constant stress patch test is not rigorous. Also, either the patch test of non-zero constant shear for Mindlin plate problem or non-zero strain gradient curvature of the microstructures cannot be performed. To improve the theory of the patch test, in this paper, based on the variational principle with relaxed continuity requirement of nonconforming element for homogeneous differential equations, the author proposed the individual element condition for passing the patch test and the convergence condition of the element: besides passing the patch test, the element function should include the rigid body modes and constant strain modes and satisfy the weak continuity condition, and no extra zero energy modes occur. Moreover, the author further established a variational principle with relaxed continuity requirement of nonconforming element for inhomogene-ous differential equations, the enhanced patch test condition and the individual element condition. To assure the convergence of the element that should pass the enhanced patch test, the element function should include the rigid body modes and non-zero strain modes which satisfied the equilibrium equations, and no spurious zero energy modes occur and should satisfy new weak continuity condition. The theory of the enhanced patch test pro-posed in this paper can be applied to both homogeneous and inhomogeneous differential equations. Based on this theory, the patch test of the non-zero constant shear stress for Mindlin plate and the C0-1 patch test of the non-zero constant curvature for the couple stress/strain gradient theory were established. | CHEN Wanji | 2006 | Science China(Physics,Mechanics & Astronomy)2006，49，2： | 2 |
| 4 | High-resolution two-photon transcranial imaging of brain using direct wavefront sensing显示文摘Imaging of the brain in its native state at high spatial resolution poses major challenges to visualization techniques.Two-photon microscopy integrated with the thinned-skull or optical clearing skull technique provides a minimally invasive tool for in vivo imaging of the cortex of mice without activating immune response and inducing brain injury.However,the imaging contrast and spatial resolution are severely compromised by the optical heterogeneity of the skull,limiting the imaging depth to the superficial layer.In this work,an optimized configuration of an adaptive optics two-photon microscope system and an improved wavefront sensing algorithm are proposed for accurate correction for the aberrations induced by the skull window and brain tissue.Using this system,we achieved subcellular resolution transcranial imaging of layer 5 pyramidal neurons up to 700μm below pia in living mice.In addition,we investigated microglia–plaque interaction in living brain of Alzheimer’s disease and demonstrated high-precision laser dendrotomy and single-spine ablation. | CONGPING CHEN ZHONGYA QIN SICONG HE SHAOJUN LIU SHUN-FAT LAU WANJIE WU DAN ZHU NANCY Y.IP JIANAN Y.QU | 2021 | Photonics Research2021，9，6： | 2 |
| 5 | Measurement of length-scale and solution of cantilever beam in couple stress elasto-plasticity显示文摘Owing to the absence of proper analytical solutionof cantilever beams for couple stress/strain gradient elas-to-plastictheory, experimental studies of the cantilever beamin the micro-scale are not suitable for the determination ofmaterial length-scale. Based on the couple stress elasto-plas-ticity,an analytical solution of thin cantilever beams is firstlypresented, and the solution can be regarded as an extension ofthe elastic and rigid-plastic solutions of pure bending beam.A comparison with numerical results shows that the currentanalytical solution is reliable for the case of σ0(?)H(?)E,where σ0 is the initial yield strength, H is the hardeningmodulus and E is the elastic modulus. Fortunately, the abovementioned condition can be satisfied for many metal materials,and thus the solution can be used to determine the materiallength-scale of micro-structures in conjunction with theexperiment of cantilever beams in the micro-scale. | Bin Ji Wanji Chen Jie Zhao | 2009 | Acta Mechanica Sinica2009，25，3： | 2 |
| 6 | A modified couple stress model for bending analysis of composite laminated beams with first order shear deformation 显示文摘 | Chen Wanji Li Li Ma Xu | 2011 | Compos Struct2011，93，： | 1 |
| 7 | Refined 9-DOF triangular Mindlin plate elements显示文摘 | CHEN Wanji CHEUNG Y K | 2001 | Int J Numer Methods Eng2001，51，12： | 1 |
| 8 | Finite element formulations of strain gradient theory for mierostructures and the C^0-1 patch test显示文摘 | AI-KAH CHEN WANJI | 2004 | Int J Number Methods Eng2004，61，： | 1 |
| 9 | Geometrically nonlinear generalized hybrid element and refined element method for non-conforming modes显示文摘 | Zheng Shijie Chen Wanji | 1995 | Acta Mechanica Sinica1995，11，2： | 1 |
| 10 | The formulation of a refined hybrid enhanced assumed strain solid shell element and its application to model smart structures containing distributed piezoelectric sensors/actuators显示文摘 | ZHENG Shijie WANG Xinwei CHEN Wanji | 2003 | Smart Materials and Structures2003，13，4： | 1 |
| 11 | Refined 9-Dof triangular Mindlin plate elements显示文摘 | Chen Wanji Cheung Y K | 2001 | International Journal for Numerical Methods in Engineering2001，51，： | 1 |
| 12 | Enhanced patch test of finite element methods显示文摘 | Wanji Chen | 2006 | Science in China Series G2006，，2： | 1 |
| 13 | A modified couple stress model for bending analysis of composite laminated beams with first order shear deformation 显示文摘 | Chen Wanji Li Li Ma Xu | 2011 | Compos Struct2011，，93： | 1 |
| 14 | A model of composite laminated Reddy beam based on a modified couple-stress theory 显示文摘 | Chen Wanji Chen Weiwei Sze K Y | 2012 | Composite Structures2012，，94： | 1 |
| 15 | A model of composite laminated Reddy beam based on a modified couple- stress theory显示文摘 | Wanji C Chen W Sze K Y | 2012 | Composite Structures2012，94，8： | 1 |
| 16 | Three-dimensional 8-node and 20-node refined hybrid isoparametric elements显示文摘 | Chen Wanji Cheung Y K | 1992 | Inter J Numer Methods Engrg1992，35，： | 1 |
| 17 | The Formulation of Refined Hybrid (EAS Solid - Shell Element and Its Application to Model Smart Structures Containing Distributed Piezoelectric Sensors/Actuators显示文摘 | Zheng Shijie Wang Xinwei Chen Wanji | 2004 | Smart Materials and Structures2004，13，4： | 1 |
| 18 | Stress analysis of laminated composite plates with a circular hole according to a single-layer higher-order model 显示文摘 | Wu Zhen Chen Wanji | 2009 | Composite Structures2009，90，： | 1 |
| 19 | Refined laminated composite plate element based on global-local higher-order shear deformation theory显示文摘 | Wu Zhen Chen Ronggeng Chen Wanji | 2005 | Composite Structures2005，，70： | 1 |
| 20 | An new analytical solution of purebending beam in couple stress elasto-plasticity: Theoryand applications 显示文摘 | Ji Bin Chen Wanji | 2010 | International Journal of Solids andStructures2010，47，： | 1 |
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