陈常青
主要研究方向为电磁机敏材料及智能结构力学、超轻多孔材料力学和微纳米力学,侧重于从跨尺度数值模拟与实验相结合角度出发,研究机敏材料和智能结构力、电、磁、热等多场耦合特性,以及多孔轻质材料的复杂力学行为。
个性化签名
- 姓名:陈常青
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学术头衔:
博士生导师, 国家杰出青年科学基金获得者, 教育部“新世纪优秀人才支持计划”入选者
- 职称:-
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学科领域:
固体力学
- 研究兴趣:主要研究方向为电磁机敏材料及智能结构力学、超轻多孔材料力学和微纳米力学,侧重于从跨尺度数值模拟与实验相结合角度出发,研究机敏材料和智能结构力、电、磁、热等多场耦合特性,以及多孔轻质材料的复杂力学行为。
陈常青,1973年3月出生,1993年,本科毕业于西安交通大学工程力学系。 1997年,获西安交通大学固体力学博士学位。 1997-2000年,英国剑桥大学工程系Research Associate。 2000-2001年,剑桥大学工程系Senior Research Associate。 2001年底,入选西安交通大学“腾飞人才计划”首批特聘教授。现为西安交通大学航天航空学院教授、博士生导师。获国家杰出青年科学基金、教育部“跨世纪人才”基金、霍英东青年教师奖(研究类二等奖)、中国高校自然科学一等奖和全国优秀博士论文奖等荣誉和奖励。 是《Multidiscipline Modeling in Materials and Structures》、《固体力学学报》、《应用力学学报》等期刊编委,中国力学学会青年工作委员会副主任委员,?中国力学学会固体力学专业委员会委员。
近年来,在压电结构和超轻多孔材料的多物理场耦合特性和力学性能表征的基础理论和应用领域开展了较系统工作。先后获得国家级和部级人才基金3项,完成国家级和省部级项目4项。目前主持在研国家863计划和国家自然科学基金项目各1项,参加国家“973”计划和国家自然科学基金重点项目等课题多项。
近几年主要研究方向为电磁机敏材料及智能结构力学、超轻多孔材料力学和微纳米力学,侧重于从跨尺度数值模拟与实验相结合角度出发,研究机敏材料和智能结构力、电、磁、热等多场耦合特性,以及多孔轻质材料的复杂力学行为。包括电磁固体力学有限变形基本理论,铁电、铁磁材料的多场耦合本构行为,电磁类智能结构变形精确分析和振动变形优化控制,泡沫金属弹塑性本构、破坏和传热等特性的细观模型和宏观唯象理论,材料和结构跨尺度力学行为模拟等。相关工作在J. Mech. Phys. Solids, Int. J. Solid Struct., ASME J. Appl. Mech., J. Appl. Phys.,Acta Mater.等期刊发表论文50余篇,被国内外同行引用400多篇次。
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成果数
5
【期刊论文】Three-dimensional modeling of the mechanical propertyof linearly elastic open cell foams
陈常青, Y.X. Gan, C. Chen *, Y.P. Shen
International Journal of Solids and Structures 42(2005)6628-6642,-0001,():
-1年11月30日
Three-dimensional Voronoi models are developed to investigate the mechanical behavior of linearly elastic open cellfoams. Dependence of the Young_s modulus, Poisson_s ratio and bulk modulus of the foams on the relative density isevaluated through finite element analysis. Obtained results show that in the low density regime the Young_s modulusand bulk modulus of random Voronoi foams can be well represented by those of Kelvin foams, and are sensitive to thegeometric imperfections inherent in the microstructure of foams. In contrast, the compressive plateau stress of thefoams is less sensitive to the imperfections. Failure surface of the foams subject to multi-axial compression is determinedand is found to comply with the maximum compressive principal stress criterion, consistent with available experimentalobservations on polymer foams. Numerical results also show that elastic buckling of cell edges at microscopiclevel is the dominant mechanism responsible for the compressive failure of elastic open cell foams.
Foams, Microstructure, Mechanical properties, Failure surface, Finite element analysis
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【期刊论文】Size e$ects in the constrained deformationof metallic foams
陈常青, C. Chen, N.A. Fleck∗
Journal of the Mechanics and Physics of Solids 50(2002)955-977,-0001,():
-1年11月30日
The constrained deformation of an aluminium alloy foam sandwiched between steel substrateshas been investigated. The sandwich plates are subjected to through-thickness shear and normalloading, and it is found that the face sheets constrain the foam against plastic deformation andresult in a size e$ect: the yield strength increases with diminishing thickness of foam layer.The strain distribution across the foam core has been measured by a visual strain mappingtechnique, and a boundary layer of reduced straining was observed adjacent to the face sheets.The deformation response of the aluminium foam layer was modelled by the elastic-plastic6nite element analysis of regular and irregular two dimensional honeycombs, bonded to rigidface sheets; in the simulations, the rotation of the boundary nodes of the cell-wall beam elementswas set to zero to simulate full constraint from the rigid face sheets. It is found that the regularhoneycomb under-estimates the size e$ect whereas the irregular honeycomb provides a faithfulrepresentation of both the observed size e$ect and the observed strain pro6le through the foamlayer. Additionally, a compressible version of the Fleck–Hutchinson strain gradient theory wasused to predict the size e$ect; by identifying the cell edge length as the relevant microstructurallength scale the strain gradient model is able to reproduce the observed strain pro6les across thelayer and the thickness dependence of strength.
Metallic foams, Size e$, ects, Strain gradient theory, Finite element method
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【期刊论文】The mode I crack growth resistance of metallic foams
陈常青, C. Chen, N.A. Fleck *, T.J. Lu
Journal of the Mechanics and Physics of Solids 49(2001)231-259,-0001,():
-1年11月30日
A Dugdale-type cohesive zone model is used to predict the mode I crack growth resistance(R-curve) of metallic foams, with the fracture process characterised by an idealised tractionseparationlaw that relates the crack surface traction to crack opening displacement. A quadraticyield function, involving the von Mises effective stress and mean stress, is used to accountfor the plastic compressibility of metallic foams. Finite element calculations are performed forthe crack growth resistance under small scale yielding and small scale bridging in plane strain,with K-field boundary conditions. The following effects upon the fracture process are quantified:material hardening, bridging strength, T-stress (the non-singular stress acting parallel tothe crack plane), and the shape of yield surface. To study the failure behaviour and notchsensitivity of metallic foams in the presence of large scale yielding, a study is made for panelsembedded with either a centre-crack or an open hole and subjected to tensile stressing. Forthe centre-cracked panel, a transition crack size is predicted for which the fracture responseswitches from net section yielding to elastic-brittle fracture. Likewise, for a panel containinga centre-hole, a transition hole diameter exists for which the fracture response switches fromnet section yielding to a local maximum stress criterion at the edge of the hole.
A., Crack tip plasticity, Notch behaviour, B., Foam material, C., Finite elements
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陈常青, C. Chen, T.J. Lu *
International Journal of Solids and Structures 37(2000)7769-7786,-0001,():
-1年11月30日
A unifed framework of constructing phenomenological constitutive models for a broad class of elasto-plastic materials exhibiting either plastical incompressibility (e.g., grey cast iron) or plastical compressibility (e.g., metal foams) is proposed. The constitutive framework also enables the di.erent yielding behaviours under tension and compression as well as di.erential hardening along di.erent loading paths to be accounted for in a relatively simple manner. The resulting plasticity model does not require the diffcult task of experimentally probing the initial yield surface and its subsequent evolution; it is completely determined from a set of as few as two distinctive stress
Constitutive laws, Elastic-plastic solids, Cellular foams, Grey cast iron, Mises materials
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【期刊论文】E.ect of imperfections on the yielding of two-dimensional foams
陈常青, C. Chen, T.J. Lu, N.A. Fleck*
J. Mech. Phys. Solids 47(1999)2235-2272,-0001,():
-1年11月30日
The infuence of each of the six di.erent types of morphological imperfection
A., Microstructures, B., Elastic-plastic material, Foam material, C., Finite elements
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