复合材料胶接修理损伤金属结构的研究现状

损伤金属飞机结构的复合材料补片胶接修理技术是一项经济而有效的结构延寿方法．详细 叙述了这种修理技术的优缺点及其技术要点,涉及的内容包括胶粘剂的选择、补片材料和参数设计、 表面处理、无损检测和试验验证等．介绍了国内外对该项先进修理技术的研究现状和在飞机结构上 的实际使用情况．评述了现有的理论分析和试验研究方法及其结果．     

基于B-样条小波的复合材料层合板灵敏度分析

基于BSWI样条小波有限元方法,将响应和响应的灵敏度系数同时看作状态变量,在Hamilton体系下推导了复合材料层合板响应和响应灵敏度系数的混合控制方程。基于该混合控制方程研究了对称铺层四边固支复合材料层合板的位移响应灵敏度系数在z方向上的分布情况,并将计算结果与有限差分法进行比较。结果表明:材料参数E₁,E₂和G₁₂对位移响应影响明显,其中以E₁对位移响应的影响最大,E₂次之。与经验法相比,半解析法计算结果相对误差小于10^-4,这说明本文的计算方法是正确的,且降低了计算成本和程序实现难度,提高了计算精度。     

Sensitivity analysis of composite laminated plates with bonding imperfection in Hamilton system

Sensitivity analysis of composite laminated plates with bonding imperfection is carried out based on the radial point interpolation method （RPIM） in a Hamilton system. A set of hybrid governing equations of response and sensitivity quantities is reduced using the spring-layer model and the modified Hellinger-Reissner （H-R） variational principle. The analytical method （AM）, the semi-analytical method （SAM）, and the finite difference method （FDM） are used for sensitivity analysis based on the reduced set of hybrid governing equations. A major advantage of the hybrid governing equations is that the convolution algorithm is avoided in sensitivity analysis. In addition, sensitivity analysis using this set of hybrid governing equations can obtain response values and sensitivity coefficients simultaneously, and accounts for bonding imperfection of composite laminated plates.     

State-vector equation with damping and vibration analysis of laminates

Based on the modified mixed Hellinger-Reissner(H-R)variational principle for elastic bodies with damping,the state-vector equation with parameters is directionally derived from the principle.A new solution for the harmonic vibration of simply supported rectangular laminates with damping is proposed by using the precise integration method and Muller method.The general solutions for the free vibration of underdamping,critical damp and overdamping of composite laminates are given simply in terms of the linear damping vibration theory.The effect of viscous damping force on the vibration of com- posite laminates is investigated through numerical examples.The state-vector equation theory and its application areas are extended.     

螺栓剪切刚度可靠性试验技术

本文在总结以往螺栓剪切刚度试验技术的基础上,设计出一种新的螺栓剪切刚度试验件． 并通过一组同一尺寸单个螺栓连接件的试验,得出一簇刚度曲线（即Ｐ－ δ曲线,Ｐ为剪切力,δ为变形）;通过可靠性分析方法,得出该种连接件螺栓刚度的分布区间,为连接件的可靠性内力分析提供技术基础．