冯西桥
微纳米力学、生物力学与仿生力学、细观损伤与断裂力学。
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 姓名：冯西桥
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学术头衔：
国家杰出青年科学基金获得者， 中国青年科技奖获得者， 教育部“新世纪优秀人才支持计划”入选者， 博士生导师
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学科领域：
力学
 研究兴趣：微纳米力学、生物力学与仿生力学、细观损伤与断裂力学。
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17
【期刊论文】Constructing tensegrity structures from onebar elementary cells
冯西桥， BY YUE LI， XIQIAO FENG， *， YANPING CAO AND HUAJIAN GAO
Proc. R. Soc. A (2010) 466, 4561，0001，（）：
1年11月30日
This study aimed to develop a method to construct tensegrity structures from elementary cells, defined as structures consisting of only one bar connected with a few strings. Comparison of various elementary cells leads to the further selection of the socalled 'Zshaped' cell, which contains one bar and three interconnected strings, as the elementary module to assemble the Zbased spatial tensegrity structures. The graph theory is utilized to analyse the topology of strings required to construct this type of tensegrity structures. It is shown that 'a string net can be used to construct a Zbased tensegrity structure if and only if its topology is a simple and bridgeless cubic graph'. Once the topology of strings has been determined, one can easily design the associated tensegrity structure by adding a deterministic number of bars. Two schemes are suggested for this design strategy. One is to enumerate all possible topologies of Zbased tensegrity for a specified number of bars or cells, and the other is to determine the tensegrity structure from a vertextruncated polyhedron. The method developed in this paper allows us to construct various types of novel tensegrity structures.
tensegrity， elementary cells， assembly， cubic graph

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【期刊论文】A phase field method for simulating morphological evolution of vesicles in electric fields
冯西桥， LingTian Gao a， XiQiao Feng a， *， Huajian Gao b
Journal of Computational Physics 228(2009)41624181，0001，（）：
1年11月30日
A phase field method is developed to investigate the morphological evolution of a vesicle in an electric field, taking into account coupled mechanical and electric effects such as bending, osmotic pressure, surface tension, flexoelectricity, and dielectricity of the membrane. The energy of the system is formulated in terms of a continuous phase field variable and the electric potential. The governing equations of the phase field and the electric field are solved using the Galerkin weighted residual approach. The validation and robustness of the algorithm are verified by direct comparisons of the obtained numerical solutions with relevant experimental results. The morphological evolution of an axisymmetric vesicle under an electric field is studied in detail. The results demonstrate that the present method can simulate complex morphological evolutions of vesicles under coupled mechanical–electrical fields.

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【期刊论文】Morphological instability of spherical soft particles induced by surface charges
冯西桥， Bo Li， XiQiao Feng， ， a) Yue Li， abd GangFeng Wang
APPLIED PHYSICS LETTERS 95, 021903 (2009)，0001，（）：
1年11月30日
We here demonstrate that surface charges on a spherical soft particle may induce its morphology instabillity. It is found that various patterns can be obtained by varying the surface charge density. The critical condition for the occurrence of surface instability and the wavelength of the induced surface patterns are derived analytically and, thereby, the morphological phase diagram of soft particles can be provided easily. Besides the electric stress, surface tension also plays a significant role in the surface evolution process. In addition, the morphological evolution behavior of a soft particle is demonstrated to exhibit distinct dependence on its size. (C) 2009 American Institute of Physics. [DOI: 10.1063/1.3177189]

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【期刊论文】An electromechanical liquid crystal model of vesicles
冯西桥
，0001，（）：
1年11月30日
Journal of the Mechanics and Physics of Solids, 2008, Vol. 56, No. 9, pp. 2844–2862.
Vesicle,， electric effect,， cell mechanics

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冯西桥
，0001，（）：
1年11月30日
Composites Part B: Engineering, 2008, Vol. 39, No. 6, pp. 933961.
Polymer–matrix composites (， PMCs)， ， Particlereinforcement， Mechanical properties

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【期刊论文】Shakedown analysis of shape memory alloy structures
冯西桥， XiQiao Feng， Qingping Sun
International Journal of Plastiity 23 (2007) 183206，0001，（）：
1年11月30日
Phase transformational shakedown of a structure refers to a status that plastic strains cease developing after a finite number of loading cycles,and subsequently the structure undergoes only elastic deformation and alternating phase transformations with limited magnitudes.Due to the intrinsic complexity in the constitutive relations of shape memory alloys (SMA),there is as yet a lack of effective methods for modeling the mechanical responses of SMA structures,especially when they develop both phase transformation and plastic deformation.This paper is devoted to present an algorithm for analyzing shakedown of SMA structures subjected to cyclic or varying loads within specified domains.Based on the phase transformation and plastic yield criteria of von Misestype and their associated flow rules,a simplified threedimensional phenomenological constitutive model is first formulated accounting for different regimes of elasticplastic deformation and phase transformation.Different responses possible for SMA bodies exposed to varying loads are discussed.The classical Melan shakedown theorem is extended to determine a lower bound of loads for transformational shakedown of SMA bodies without necessity of a stepbystep analysis along the loading history.Finally,a simple example is given to illustrate the application of the present theory as well as some basic features of shakedown of SMA structures.It is interesting to find that phase transformation may either increase or decrease the loadbearing capacity of a structure,depending upon its constitutive relations,geometries and the loading mode.
Shape memory alloy， Phase transformation， Constitutive relation， Shakedown analysis， Ratcheting， Cyclic plasticity

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冯西桥， XiQiao Feng， Xuefeng Gao， Ziniu Wu， Lei Jiang， QuanShui Zheng
Langmuir 2007, 23, 48924896，0001，（）：
1年11月30日
Water striders are a type of insect with the remarkable ability to stand effortlessly and walk quickly on water.This article reports the water repellency mechanism of water strider legs.Scanning electron microscope (SEM) observations reveal the uniquely hierarchical structure on the legs,consisting of numerous oriented needleshaped microsetae with elaborate nanogrooves.The maximal supporting force of a single leg against water surprisingly reaches up to 152 dynes,about 15 times the total body weight of this insect.We theoretically demonstrate that the cooperation of nanogroove structures on the oriented microsetae,in conjunction with the wax on the leg,renders such water repellency.This finding might be helpful in the design of innovative miniature aquatic devices and nonwetting materials.

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【期刊论文】Ultrasonic technique for extracting nanofibers from nature materials
冯西桥， HongPing Zhao， XiQiao Feng， Huajian Gao
APPLIED PHYSICS LETTERS 90, 073112 (2007)，0001，（）：
1年11月30日
This letter reports a simple and versatile approach for extracting bionanofibers from natural materials using the ultrasonic technique.Bionanofibers have been fabricated from various materials,e.g.,spider and silkworm silks,chitin fibers,collagen,cotton,bamboo,and ramee and hemp fibers.The obtained nanofibers have uniform diameters in the range of 25120 nm and possess the optimized hierarchical structures and superior properties of natural materials which have formed after the evolution of many millions of years.This methodology might be valuable to provide a convenient,versatile,and environmentally benign fabrication method for producing bionanofibers at an industrial scale.

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冯西桥， GangFeng Wang， XiQiao Feng
APPLIED PHYSICS LETTERS 90, 231904 (2007)，0001，（）：
1年11月30日
Surface effects often play a significant role in the physical properties of micro and nanosized materials and structures.In this letter,the authors presented a theoretical model directed towards investigation of the effects of both surface elasticity and residual surface tension on the natural frequency of microbeams.A thin surface layer was introduced on the upper and lower surfaces to rationalize the nearsurface material properties that are different from the bulk material.An explicit solution is derived for the natural frequency of microbeams with surface effects.This study might be helpful for the design of microbeambased sensors and some related measurement techniques.

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冯西桥， GangFeng Wang， XiQiao Feng
APPLIED PHYSICS LETTERS 90, 231904 (2007)，0001，（）：
1年11月30日
Surface effects often play a significant role in the physical properties of micro and nanosized materials and structures.In this letter,the authors presented a theoretical model directed towards investigation of the effects of both surface elasticity and residual surface tension on the natural frequency of microbeams.A thin surface layer was introduced on the upper and lower surfaces to rationalize the nearsurface material properties that are different from the bulk material.An explicit solution is derived for the natural frequency of microbeams with surface effects.This study might be helpful for the design of microbeambased sensors and some related measurement techniques.

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