机织复合材料力学性能的细观分析与实验研究

建立了预测机织复合材料弹性性能和强度的方法并进行了相应的实验研究,系统地研究了织物几何和结构参数对机织复合材料性能的影响,提出了优化机织复合材料弹性性能细观结构参数的选择,完成了具有友好界面的机织复合材料弹性性能分析软件,实验研究了冲击后的拉伸与压缩性能及疲劳剩余强度和寿命,建立了基于有限元分析和失效准则预测冲击能门槛值的方法,给出了预估疲劳寿命的公式,且实验验证了分析方法的正确性。为复合材料技术能更快地转移到飞机结构设计与制造中去提供了一套较完整的基础性数据和理论分析方法及工具。 

MICROMECHANICAL ANALYSIS AND EXPERIMENTAL EVALUATION OF THE PROPERTY OF WOVEN COMPOSITE MATERIALS

A prediction of the elastic property and strength of woven composites was established. Corresponding experimental studies were completed. The effects of various structural and geometrical parameters on the properties of woven composites were studied systematically. Fabric micro structural parameter determination for optimizing the elastic properties of woven composites was provided. A code with user friendly interface has been developed to provide an efficient calculation tool in selecting the best fabric reinforcement for structural composites. Tensile and compressive strength after impact, residual fatigue strength and fatigue life were evaluated experimentally. A finite element analysis coupled with failure criteria was developed to predict the impact threshold energy of the composites. Equations of predicting the fatigue life for woven composites were provided. Comparison of experimental data with the prediction results shows good agreement, thus confirming the usefulness of the predictions.