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国家自然科学基金(10272103)

作品数:4 被引量:12H指数:2
相关作者:王自强郭香华冯秀艳方岱宁陈少华更多>>
相关机构:中国科学院力学研究所清华大学更多>>
发文基金:国家自然科学基金更多>>
相关领域:理学更多>>

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考虑压头曲率半径的J_2形变理论压痕有限元分析被引量:1
2005年
采用经典J_2 形变理论 ,在考虑压头曲率半径的前提下 ,针对几组微压痕实验进行了有限元数值模拟 ,给出理论计算结果并与实验进行了系统比较 .结果发现考虑了压头曲率半径后的经典J_2 形变理论得到的整段计算曲线不能和实验曲线吻合 ,可以推理出即使考虑压头曲率半径的的影响 ,经典J_2 形变理论也不能很好地解释实验现象 .
陶彩军王自强陈少华
关键词:弹塑性力学
微薄梁三点弯曲尺度效应的理论分析
根据Fleck和Hutchinson的拉伸应变梯度理论和最小势能原理,结合平面应变薄梁弯曲模型,建立了既考虑转动梯度影响又考虑拉伸应变梯度影响的微薄梁三点弯曲的控制方程及边界条件,并应用拟牛顿法和龙格-库塔法进行求解,将...
冯秀艳王自强
关键词:应变梯度
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微薄梁三点弯曲的尺度效应研究被引量:8
2007年
应用高灵敏度的力传感器以及时间序列电子散斑干涉法,同时测出了不同厚度纯镍薄片三点弯曲试件的抗力与变形,得到薄梁中心点处的载荷与挠度曲线.应用Fleck和Hutchinson的偶应力理论,结合平面应变弯曲模型,建立了薄梁处于弹性状态和弹塑性状态的控制方程,应用Runge-Kutta法进行数值求解,并将计算得到的载荷-挠度曲线以及无量纲化弯矩-表面应变曲线和实验结果进行了比较.在理论计算过程中,没有拟合任何材料参数,所有的材料参数均来自实验测量的结果,材料特征尺度也是根据Stolken和Evans的工作给出的.结果表明:应用偶应力理论预测的结果和实验结果符合良好,而经典理论的预测结果与实验不相符合.
冯秀艳郭香华方岱宁王自强
关键词:偶应力应变梯度RUNGE-KUTTA法
NANOINDENTATION OF THIN-FILM-SUBSTRATE SYSTEM DETERMINATION OF FILM HARDNESS AND YOUNG'S MODULUS被引量:2
2004年
In the present paper,the hardness and Young's modulus of film-substrate systems are determined by means of nanoindentation experiments and modified models.Aluminum film and two kinds of substrates,i.e.glass and silicon,are studied.Nanoindentation XP Ⅱ and continuous stiffness mode are used during the experiments.In order to avoid the influence of the Oliver and Pharr method used in the experiments,the experiment data are analyzed with the constant Young's modulus assumption and the equal hardness assumption.The volume fraction model(CZ model)proposed by Fabes et al.(1992)is used and modified to analyze the measured hardness.The method proposed by Doerner and Nix(DN formula)(1986)is modified to analyze the measured Young's modulus.Two kinds of modified empirical formula are used to predict the present experiment results and those in the literature,which include the results of two kinds of systems,i.e.,a soft film on a hard substrate and a hard film on a soft substrate.In the modified CZ model,the indentation influence angle,(?), is considered as a relevant physical parameter,which embodies the effects of the indenter tip radius, pile-up or sink-in phenomena and deformation of film and substrate.
陈少华刘磊王自强
关键词:NANOINDENTATIONHARDNESS
Finite boundary effects in problem of a crack perpendicular to and terminating at a bimaterial interface被引量:1
2005年
In this paper, the problem of a crack perpendicular to and terminating at an interface in bimaterial structure with finite boundaries is investigated. The dislocation simulation method and boundary collocation approach are used to derive and solve the basic equations. Two kinds of loading form are considered when the crack lies in a softer or a stiffer material, one is an ideal loading and the other one fits to the practical experiment loading. Complete solutions of the stress field including the T stress are obtained as well as the stress intensity factors. Influences of T stress on the stress field ahead of the crack tip are studied. Finite boundary effects on the stress intensity factors are emphasized. Comparisons with the problem presented by Chen et al. (Int. J. Solids and Structure, 2003, 40, 2731–2755) are discussed also.
ShaohuaChenTzuchiangWangSharonKao-Walter
关键词:CRACK
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