【作者】 张楠；

【导师】 段成红；

【作者基本信息】 北京化工大学 ， 化工过程机械， 2013， 硕士

【摘要】 本文的研究内容主要分为复合材料细观力学分析和复合材料圆筒壳轴向压缩性能分析两个部分。对于复合材料细观力学分析,本文首先通过ANSYS有限元软件建立碳纤维增强树脂基体复合材料特征体积元模型,分析了一定纤维体积含量复合材料的基本力学参数,包括弹性模量、剪切模量和泊松比。随后对不同纤维体积含量的复合材料进行对比研究,预测不同纤维含量对复合材料力学性能的影响。最后得出某一特定纤维含量复合材料的力学参数,并与后续实验所用的材料力学参数进行对比。对于复合材料圆筒壳轴向压缩性能的研究,主要分为复合材料圆筒壳轴向压缩模态分析和准静态压缩性能分析两个部分。本文应用非线性计算软件ABAQUS模拟碳纤维增强树脂基体复合材料圆筒壳的力学响应,首先通过压缩过程的模态分析预测筒体两端有和没有加强层试样的模态,对比研究有无加强层对复合材料圆筒壳屈曲面载荷的影响。其次通过压缩模态分析研究不同纤维缠绕角对两端具有加强层圆筒壳试样轴压性能的影响。随后研究具有不同角度预裂纹复合材料圆筒壳在轴向载荷作用下的性能,通过模态分析对比研究裂纹破坏的趋势,并与实验结果进行对比。最后通过准静态压缩分析模拟碳纤维增强树脂基体复合材料圆筒壳的压缩过程,从破坏载荷和能量变化角度预测不同角度预裂纹试样的压缩性能,对比分析不同预裂纹试样的性能差距,并最终与实验结果进行对比,进一步了解复合材料圆筒壳的轴压性能。更多还原

【Abstract】 The main content of the paper includes two parts:of composite and mechanical performance analysis of the composite under axial loads.For the microscopic mechanical analysis, firstly, the representive volume element model about carbon fiber reinforced resin matrix composite is established by the ANSYS software, and mechanical performances, including elasticity modulus, shear modulus and poisson ratio, are obtained by analyzing the composite with different fiber volume fractions. Secondly, the effects of different fiber volume fractions on mechanical performances of composite are predicted by comparative study. Lastly, the mechanical performances of the composite with a specific fiber volume fraction are solved to compare with experimental results.For the axial compression property research of the composite cylinder, it is divided into two parts:the buckling analysis of the composite cylinder under axial loads and the quasi-static compression analysis of the composite cylinder. The mechanical response of the composite cylinder is simulated by the ABAQUS nonlinear software. Firstly, the modal of the composite cylinder with or without reinforced layers is predicted by the simulation of compression process, and the influence of reinforced layers on the buckling load is studied by comparison. Secondly, the influence of different fiber wound angles on compression properties of the composite with reinforced layers is studied by modal analysis.And then, the properties of composite under axial loads are studied, with consideration that the angle of pre-crack is various, and the trend of the crack growth is analyzed by the result of modals to compare with the experimental result. At last, a quasi-static compression analysis is simulated to observe the compression process of carbon fiber reinforced resin matrix composite, and the damage load and energy change are used to predict the compression performance of cylinders with different pre-crack angles.The performance discrepancy of the composite cylinder with pre-cracks is analyzed to compare with the experimental result, and the axial compression performance of the composite cylinder is further understood.更多还原