王刚锋
纳米力学;生物力学;固体力学。
个性化签名
- 姓名:王刚锋
- 目前身份:
- 担任导师情况:
- 学位:
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学术头衔:
博士生导师, 教育部“新世纪优秀人才支持计划”入选者
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学科领域:
力学
- 研究兴趣:纳米力学;生物力学;固体力学。
王刚锋,博士,教授,博士生导师。
教育经历:1995年 天津大学工程力学学士;1998年 清华大学固体力学硕士;2001年 清华大学固体力学博士。
工作经历:2002年 新加坡南洋理工大学,博士后;2003年 荷兰格罗宁根大学应用物理系,博士后;2004年 加拿大阿尔伯塔大学,博士后;2005年 新加坡国立大学纳米技术中心,研究员;2006年 西安交通大学航天航空学院,教授,博士生导师;2007年 入选“教育部新世纪人才”计划;2009年 西安交通大学腾飞特聘教授。
研究领域:纳米力学;生物力学;固体力学。
研究成果:在Appl. Phys. Lett., J. Appl. Phys., ASME J. Appl. Mech.等刊物上发表论文50余篇,其中SCI收录40余篇。
学术兼职:APL, Thin Solid Film, JAP, Surface Science, J. Elasticity, Engng. Fract. Mech., Comp. Mate. Sci.等刊物评阅人。中国力学学会 青年工作委员会 委员。
个人主页:http://gr.xjtu.edu.cn:8080/c/portal/layout?p_l_id=PUB.1706.1
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1253
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402
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成果数
11
王刚锋, G.F. Wanga)
JOURNAL OF APPLIED PHYSICS 105, 013507(2009),-0001,():
-1年11月30日
In the present paper, the multiple diffraction of plane harmonic compressional waves P-wave by two nanosized circular cylindrical holes embedded in an elastic solid is investigated. The surface elasticity theory is adopted to account for the effect of surface energy at nanoscales. It is found that when the radii of holes reduce to nanometers, surface energy significantly affects the diffraction of elastic waves. The dynamic stresses around the holes under incident waves of different frequencies are examined to display the influence of surface energy and the interaction between holes in the multiple scattering phenomena.
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【期刊论文】Surface effects on buckling of nanowires under uniaxial compression
王刚锋, Gang-Feng Wang, a) and Xi-Qiao Feng
APPLIED PHYSICS LETTERS 94, 141913(2009),-0001,():
-1年11月30日
Based on the conventional Euler buckling model, uniaxial compression tests have been utilized recently to measure the mechanical properties of nanowires. However, owing to the increasing ratio of surface area to bulk at nanoscale, the influence of surface energy becomes prominent and should be taken into consideration. In this letter, an analytical relation is given for the critical force of axial buckling of a nanowire by accounting for both the effects of surface elasticity and residual surface tension. This study might be helpful to characterize the mechanical properties of nanowires or design nanobeam-based devices in a wide range of applications.
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【期刊论文】Surface Effects on the Near-Tip Stresses for Mode-I and Mode-III Cracks
王刚锋, Gang-Feng Wang, Xi-Qiao Feng, Tie-Jun Wang, Wei Gao
JANUARY 2008, Vol.75,-0001,():
-1年11月30日
Based on the surface elasticity theory and using a local asymptotic approach, we analyzed the influences of surface energy on the stress distributions near a blunt crack tip. The dependence relationship of the crack-tip stresses on surface elastic parameters is obtained for both mode-I and mode-III cracks. It is found that when the curvature radius of a crack front decreases to nanometers, surface energy significantly affects the stress intensities near the crack tip. Using a kind of surface elements, we also performed finite element simulations to examine the surface effects on the near-tip stresses. The obtained analytical solution agrees well with the numerical results.
crack, surface elasticity, stress, nanomechanics
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王刚锋, Gang-Feng Wanga), Xi-Qiao 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 near-surface 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 microbeam-based sensors and some related measurement techniques.
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【期刊论文】Effects of surface stresses on contact problems at nanoscale
王刚锋, G.F. Wanga), X.Q. Feng
JOURNAL OF APPLIED PHYSICS 101, 013510 2007 ,-0001,():
-1年11月30日
Based on the surface elasticity theory, we examined the effects of surface stresses on nanosized contact problems. The Fourier integral transform method is adopted to derive the general solution for the contact problem under pressure. As two examples, the deformations induced, respectively, by a uniform distributed pressure and a concentrated force are analyzed in detail. The results indicate some interesting characteristics in contact mechanics, which are distinctly different from those in classical elasticity theory. Both the contact normal stress and the deformation gradient on the deformed surface vary smoothly across the loading boundary as a result of surface stress. In addition, the indent depth and the maximum normal contact stress depend strongly on the surface stress for nanoindentation.
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【期刊论文】The Contact Problem in a Compressible Hyperelastic Material
王刚锋, G.F. Wang, T.J. Wang
JULY 2007, Vol.74,-0001,():
-1年11月30日
We consider the contact problem for a particular class of compressible hyperelastic materials of harmonic type undergoing finite plane deformations. Using complex variable techniques, we derive subsidiary results concerning a half-plane problem corresponding to this class of materials. Using these results, we solve the contact problem for a harmonic material in the case of a uniform load acting on a finite area. Finally, we show how we can then deduce the corresponding results for the case of a point load.
contact problem, finite elastic deformations, harmonic materials
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【期刊论文】Surface effects on the diffraction of plane compressional waves by a nanosized circular hole
王刚锋, G.F. Wanga) and T.J. Wang
APPLIED PHYSICS LETTERS 89, 231923 2006 ,-0001,():
-1年11月30日
In the present letter, the authors consider the diffraction of plane harmonic compressional wave (P wave) by a nanosized circular hole. The surface elasticity theory is employed to incorporate the surface effects. The results show that once the radius of hole reduces to nanometers, surface energy significantly affects the diffraction of elastic waves. For incident waves with different frequencies, the influences of surface elasticity on dynamic stress concentration are discussed in details.
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【期刊论文】Deformation around a nanosized elliptical hole with surface effect
王刚锋, G.F. Wanga) and T.J. Wang
APPLIED PHYSICS LETTERS 89, 161901 2006 ,-0001,():
-1年11月30日
In the present letter, the effect of surface energy on the deformation around an elliptical hole is analyzed, and the closed-form solution is obtained by the complex variable formulation. The results show that when the size of the hole reduces to the same order of the ratio of surface energy to applied stress, the contribution from surface becomes important, and the shape of the hole coupled with surface energy has significant effect on the elastic state around the hole.
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【期刊论文】A piezoelectric constitutive theory with rotation gradient effects
王刚锋, Gang-Feng Wang, Shou-Wen Yu, Xi-Qiao Feng∗
European Journal of Mechanics A/Solids 23(2004)455-466,-0001,():
-1年11月30日
Some recent experiments evidenced that the piezoelectric coefficients of such piezoelectric materials as PZT and BiTiO3 have an evident dependence on the grain size. With respect to the success of strain gradient theories in interpreting size effect phenomena of conventional (non-piezoelectric) solids and the dependence of piezoelectricity on rotation of polar clusters, a new piezoelectric theory with rotation gradient effects is formulated in the present paper to elucidate the size effect problems of piezoelectric solids. The constitutive relations of materials with different symmetries are specialized, and their corresponding independent material constants are discussed. For the typical 6 mm class of piezoelectric crystalline materials, a potential function method is presented for solving plane problems. The analytical solution of a thin piezoelectric film bonded on a rigid substrate illustrates the size-dependent prediction of the present theory.
Piezoelectricity, Constitutive relation, Rotation gradient, Size effect, Couple stress
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【期刊论文】Interface effects on effective elastic moduli of nanocrystalline materials
王刚锋, Gang-Feng Wang a, Xi-Qiao Feng∗, Shou-Wen Yu a, Ce-Wen Nan b
Materials Science and Engineering A363(2003)1-8,-0001,():
-1年11月30日
Interfaces often play a significant role in many physical properties and phenomena of nanocrystalline materials (NcMs). In the present paper, the interface effects on the effective elastic property of NcMs are investigated. First, an atomic potential method is suggested for estimating the effective elastic modulus of an interface phase. Then, the Mori-Tanaka effective field method is employed to determine the overall effective elastic moduli of a nanocrystalline material, which is regarded as a binary composite consisting of a crystal or inclusion phase with regular lattice connected by an amorphous-like interface or matrix phase. Finally, the stiffening effects of strain gradients are examined on the effective elastic property by using the strain gradient theory to analyze a representative unit cell. Our analysis shows two physical mechanisms of interfaces that influence the effective stiffness and other mechanical properties of materials. One is the softening effect due to the distorted atomic structures and the increased atomic spacings in interface regions, and another is the baffling effect due to the existence of boundary layers between the interface phase and the crystalline phase.
Nanocrystalline material, Interface, Elastic modulus, Strain gradient effects, Couple stress, Microstructure
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