2.5维织物及其复合件的基本力学性能分析

发布时间：2017-12-26 19:15

  本文关键词：2.5维织物及其复合件的基本力学性能分析　出处：《哈尔滨工业大学》2016年硕士论文　论文类型：学位论文

  更多相关文章： 2.5维织物 几何模型 变形行为 弹性模量 强度

【摘要】：2.5维织物是一种特殊的三维织物,在厚度方向上具有更好的力学性能,在航空、航天相关领域都受到学者们的广泛关注,具有良好的应用价值前景。本文对径向增强的2.5维织物和2.5维机织复合材料进行分析。通过理论分析、实验测试对结构的基本力学性能进行分析。第一章介绍本文的研究背景以及研究意义,对国内外关于织物的力学性能方面研究、细观模型研究以及成型工艺方面研究进行了概述。第二章对2.5维织物细观结构进行分析。利用显微镜观察纱线的截面形状和接结经纱走向,确定相应的几何模型。基于确立的几何模型对2.5维织物进行理论分析,首先,通过能量等效的方法计算织物的宏观弹性模量;然后根据纱线的变形情况分析织物的厚度和宽度变化;最后通过改变取向角与层数,得出2.5维织物的弹性模量与取向角、层数的关系。第三章对2.5维织物变形行为进行分析。通过拉伸实验测试分析拉伸变形率和拉伸残余变形率,得出织物在拉伸载荷作用下的拉伸变形情况。其次,对织物的厚度变形率进行分析,得出径向拉伸过程中织物的厚度变化情况。第四章应用浸渍复合法和RTM复合法制备2.5维机织复合材料。首先根据工艺要求设计一套复合模具;然后根据工艺条件确定复合工艺流程;最后对复合后试件进行了C扫描检测,检验制备的试件是否含有缺陷,并且通过扫描结果对两种复合工艺进行比较,指出各自的优缺点。第五章分析2.5维机织复合材料力学性能。首先通过理论计算得出2.5维机织复合材料的纤维体积含量;然后对复合后结构进行了拉伸、压缩以及三点弯曲实验测试,对失效模式、测试结果进行分析得出:两种复合制备方法的力学性能是否有区别以及预变形对结构的力学性能影响规律。
[Abstract]:2.5 dimensional fabric is a special 3D fabric. It has better mechanical properties in thickness direction. It has been widely concerned in aviation and aerospace related fields, and has good application prospects. In this paper, a radial reinforced 2.5 - dimensional fabric and a 2.5 - dimensional woven composite are analyzed. The basic mechanical properties of the structure are analyzed by theoretical analysis and experimental test. The first chapter introduces the background and significance of the research, and summarizes the research on mechanical properties, meso model and molding technology of fabrics at home and abroad. In the second chapter, the microstructure of the 2.5 dimensional fabric is analyzed. The geometric model of the yarn is determined by observing the cross section shape of the yarn and the alignment of the warp yarn with the microscope. The geometric model established by theoretical analysis, the 2.5 dimensional fabric based on the first, through the method of equivalent energy calculation of the macroscopic elastic modulus of fabric; then analyzes the changes of width and thickness of the fabric according to the deformation of yarn; finally, by changing the orientation angle and the number of layers, the elastic modulus and the orientation angle of 2.5 dimensional fabric and the number of. In the third chapter, the deformation behavior of 2.5 dimensional fabric is analyzed. The tensile deformation rate and the tensile residual deformation rate were analyzed by tensile test, and the tensile deformation of the fabric under tensile load was obtained. Secondly, the thickness deformation rate of the fabric is analyzed, and the change of the fabric thickness during the radial tensile process is obtained. In the fourth chapter, 2.5 - dimensional woven composites were prepared by impregnation composite method and RTM composite method. According to the technological requirements to design a set of compound die; and then determine the composite process according to the process conditions; at the end of the composite specimens were detected by C scanning, test whether the preparation of specimens with defects, and two kinds of composite processes were compared by scanning results, pointed out their advantages and disadvantages. In the fifth chapter, the mechanical properties of 2.5 - dimensional woven composites are analyzed. Fiber volume content first through the theoretical calculation of 2.5 dimensional woven composites; then the composite structure of tensile, compression and three point bending test, the failure mode, analyze the test results obtained: two composite preparation method of mechanical properties and whether there is a difference between the pre deformation on the mechanical properties of the structure of the law.
【学位授予单位】：哈尔滨工业大学
【学位级别】：硕士
【学位授予年份】：2016
【分类号】：V250
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本文编号：1338496