半无限带状各向异性材料的应力效应衰减估计

对带端面负载的半无限带状各向异性弹性材料建立了Saint-Venant原理.应用能量方法确立了应力效应衰减率的下界,得出了用各向异性材料的弹性常量表示的估计显式.最后,为了说明所得结果,对带端面负载、纤维偏离主轴的石墨-环氧树脂的衰减率给出数值实例.     

纤维与基体的轴对称界面端附近的奇异应力场

基于各向性弹性力学空间轴对称问题的基本方程,研究了纤维与基体的轴对称界面端的应力奇异性,并给出了界最佳 近的奇异应力场。研究结果表明,该轴对称界面端的应力奇异性与平面应变状态下相应模型的应力奇异性完全相同,材料对界面端附近奇异应力场的影响可用丰个双材料组合参数描述。     

正交异性体某些断裂动力学问题

首先对具有任意自相似指数的正交异性弹性动力学问题推导了解的一般表示,给出了一般解法,然后用这一方法对若干具体问题进行求解,利用本文方法可以迅速将所论问题化为半平面上的Ｒｉｍａｎｎ－Ｈｉｌｂｅｒｔ问题,并可以相当简单地得到问题的闭合解。     

Identification of Cavities Inside Two-Dimensional Heterogeneous Isotropic Elastic Bodies

In this paper, we discuss the uniqueness in determining cavities (i.e., nonrectilinear cracks) in a heterogeneous isotropic elastic medium in two dimensions. Our main result asserts that there is at most one cavity in the elastic medium which yields the same surface displacements and stresses on an arbitarily small portion of the boundary. The boundaries of cavities are assumed to be piecewise smooth and admit edges where no net force is exerted. The key of the proof is the unique continuation for the isotropic Lamé system and geometric considerations. This revised version was published online in August 2006 with corrections to the Cover Date.     

Green function and its application for a piezoelectric plate with various openings

Summary For a two-dimensional piezoelectric plate subjected to mechanical and electric load, a Green function satisfying traction free and exact electric boundary conditions along a hole is developed using Lekhnitskii's formalism and the technique of conformal mapping. The critical points for the mapping function used is investigated numerically, and the study indicates that the transformation of a polygonal hole in a piezoelectric plate into a unit circle is nonsingle-valued. A simple approach is presented to treat such a situation. Based on the Green function developed in this paper, a system of singular integral equations for the unknown dislocation defined on crack faces is presented to study the interaction between cracks and holes. Numerical results are presented to elucidate the effects of crack orientation on stress and electric displacement (SED) intensity factors and to illustrate the application of the proposed formulation. Received 4 June 1998, accepted for publication 15 July 1988     

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分析了耐磨胶粘涂层基体与填充微粒间的微观热应力．结果表明,基体中热应力在相间界面达最大值;温差还可能导致基体屈服并导致界面脱粘．     

应力场强(SFI)法下的疲劳缺口系数K_f的计算

着重研究场强法理论下疲劳缺口系数Kf的计算．结果表明应力场强法理论下的疲劳缺口系数Kf与试验结果符合得较好,用应力场强法理论计算得到的等幅和变辐载荷的寿命与试验寿命也符合得较好．     

预应力混凝土空心板梁的温度应力分析

以南京新机场高速公路施工预制场预制的预应力空心板梁由于温度应力产生的裂缝为例,进行了温度应力的分析和计算,并提出了裂缝的预防和弥补的措施．     

纤维金属层极疲劳寿命预测的研究进展

简要介绍了纤维金属展板的起源、性能特点、应用现状与前景,对其疲劳损伤机理作了简要分析．对影响层板疲劳寿命的两个关键因素──桥接应力与分层扩展从理论分析与测量技术两方面结合自己的研究成果作了系统评析．详细分析了层板在等幅疲劳下寿命预测的研究现状．介绍了层板在变幅载荷下的疲劳行为（包括裂纹扩展与分层扩展）与寿命预测的研究进展,指出了目前预测模型的有待改进的建议．      

用光塑性方法确定工程构件的疲劳裂纹扩展荷载门槛值

提出疲劳裂纹尖端塑性核半径门榄值Ｒｔｈ的概念及计算方法,Ｒｔｈ是材料性质,在满足光塑性相似关系要求及模型与原型几何形状尺寸相同的前提下,模型与原型间的相似系数ｎ为两种材料屈服极限之比。