【作者】 杨彩云；

【导师】 李嘉禄；

【作者基本信息】 天津工业大学 ， 纺织工程， 2005， 博士

【摘要】 本文深入、系统地对三维角联锁结构复合材料的力学性能进行了实验研究,并采用纺织复合材料力学分析方法对其等效工程弹性常数进行了理论预测。在深入研究三维角联锁组织结构的基础上,首次给出了三维角联锁组织结构演变规律,并根据给定参数后的确定性与否分为正则角联锁结构和变则角联锁结构,其中,常用的正则角联锁结构可以分为12种。采用T700 12K碳纤维在本研究所自制的设备上织造出了正交角联锁结构、带衬纬的正交角联锁结构、带衬经的正交角联锁结构、带衬经和衬纬正交角联锁结构等四种不同结构的三维角联锁结构预制件,并采用树脂传递模塑法在本研究所制成树脂基复合材料。在深入细致地观察、分析复合材料的细观结构的基础上,确认三维角联锁结构复合材料中纬纱横截面实际形态近似为凸透镜形,而经纱近似为矩形,衬经纱、衬纬纱、纬纱在复合材料中基本呈直线状态,接结经纱可视为由两部分组成:直线段(带衬纬的结构中直线段略有弯曲)和紧密包附在纬纱表面的圆弧段,在此基础上,建立了全新的三维角联锁结构复合材料几何分析模型。在日本岛津(SHXMADZU)的AG-250KNE型万能材料试验机以及自行设计、配套的电阻应变测量系统上系统地测试了四种不同角联锁结构复合材料沿五种偏轴角0°、30°、45°、60°、90°的拉伸、压缩、弯曲性能。首次推导出了三维角联锁结构复合材料的设计参数与等效工程弹性常数预测公式之间的关系。运用纺织复合材料力学分析理论,建立了五种力学分析模型,又基于纤维取向平均原理,编制了三维角联锁结构复合材料的等效工程弹性常数预测软件。通过对实验数据的研究、分析本文确认:本研究中四种结构的三维角联锁结构复合材料的力学性能存在明显的正交各向异性;衬纱对三维角联锁结构复合材料的强度和模量贡献较大,尤其是当作用力沿着衬纱方向时,衬纱的作用尤为明显。通过将等效工程弹性常数的理论预测结果与实测结果进行研究、对比本文确认:本文编制的三维角联锁结构复合材料等效工程弹性常数预测系统真实、可靠、实用;其中以等应变力学分析模型最接近实测值。理论预测值与实测值之间总体趋势基本吻合。更多还原

【Abstract】 In the thesis, the mechanical properties of 3D angle-interlock architecture composites were studied experimentally, and the equivalent engineering elastic constants were predicted theoretically using the mechanical analyzing method of textile composites.Based on researching various weave structures of angle-interlock architecture, evolvement rule of angle-interlock architecture is presented firstly. The structures of angle-interlock architecture are classified into two kinds, one is regular angle-interlock architectures, and the other is irregular angle-interlock architectures. Among all regular angle-interlock weave structures there are 12 different kinds of weaves which are used in making composites widely.The four preforms with different weave structures were woven using T700 12K carbon fiber on the loom designed and manufactured by our institute, they are orthogonal angle-interlock weave, orthogonal angle-interlock weave with stuffer warp, orthogonal angle-interlock weave with stuffer weft, orthogonal angle-interlock weave with both, which were made into composites by means of Resin Transfer Molding.Based on observing and analyzing the photo images of composites architecture manufactured by us, it is affirmed that the cross section of weft in composites is close to convex and the cross section of warp in composites is close to rectangle, and stuffer warp、stuffer weft and weft are linear, but stitching warp is curve. The curve is consisted of two sections, one is linear and the other is arc that equal to contour line of the cross section of weft. The brand new geometric models are set.Tensile, compress and bend properties of the composites along 0°、30°、45°、60°、90°directions were measured on Shimadzu Material Equipment manufactured by Japan, which was equipped with a set of resistance stress measuring system built by ourselves.It is deduced and presented firstly that the numerical relationship between preform design parameters and elastic constants predicting equations.The computer predicting system software is programmed based on orientation averaging model theory and five mechanical analyzing models.Based on studying and analyzing experiment data, it is affirmed that there are orthogonal anisotropy with the four angle-interlock weave preform composites, and stuffer yarn plays an important part to increasing strength and modulus, especially when applying force is along stuffer yarn direction.Based on comparing theory prediction values of equivalent engineering elastic constants and experiments data, it is affirmed that the predicting system of equivalent engineering elastic constants programmed by the author is actual, reliable and practical, and the proximal mechanical analyzing model is equi-strain model. Both values of theory prediction of equivalent engineering elastic constants and experiments data are accordant.更多还原