半豆荚杆ADP工艺预处理技术研究

发布时间：2018-06-19 15:51

本文选题：复合材料 + 半豆荚杆　；参考：《南京航空航天大学》2015年硕士论文

【摘要】：复合材料豆荚杆在大型空间可展开结构中有着广泛的应用前景,是近期航天领域的一个研究热点。先进拉挤(Advanced Pultrusion,简称ADP)技术是一种高自动化、低成本的连续成型方法,非常适合超长复合材料豆荚杆的制备。本文以复合材料半豆荚杆为研究对象,针对现有ADP技术制备的半豆荚杆制件存在的表面纤维畸变、步进纹以及厚度不足等缺陷展开了相应的改进研究,提出了预处理方法,确定了预处理工艺参数,并研究了预处理工艺对制件性能的影响,最后采用预处理技术完成了半豆荚杆的试制,减轻了上述缺陷、获得了质量优良的制件。本文主要工作如下:(1)应用树脂流动模型,分析了各项因素对制件缺陷的影响,并提出了预处理方案,即在预浸料进入热压模具之前对其进行预热处理,使预浸料中的树脂发生凝胶,减少树脂在压力作用下的流动,进而消除上述缺陷。根据半豆荚杆制件对厚度的要求,通过计算提出了预处理工艺指标,将所用超薄预浸料树脂流失质量分数控制在2.3%。(2)对所用树脂体系进行了DSC测试和粘度测试,结合预处理工艺对加工效率的要求,初步确定了适合预处理工艺的温度:100℃、105℃、110℃。在上述温度条件下,利用烘箱预热、热压装置热压挤胶的方法,模拟了ADP工艺过程中的树脂流动,以试验前后预浸料树脂质量流失2.3%为目标,确定了适合ADP工艺的三组预处理参数:100℃下保温48min、105℃下保温42min、110℃下保温23min。(3)采用上述预处理工艺制备了与半豆荚杆铺层相同的复合材料层合板,对其树脂含量、厚度、轴向拉伸性能、层间拉伸性能进行了测试。结果表明,预处理工艺制得的试样树脂含量和厚度得到了有效的控制,试样的轴向拉伸性能和层间拉伸性能都没有发生明显降低,表明预处理工艺满足豆荚杆的实际使用要求。(4)在实验室ADP装备的基础上,搭建了可连续成型的预处理装置,在100℃保温48min的预处理工艺参数下对半豆荚杆进行了试制。制备的半豆荚杆制件表面纤维畸变得到消除、步进纹缺陷明显减轻,制件厚度也达到设计要求。在半豆荚杆上取样,分别进行了轴向拉伸试验、层间拉伸试验,验证得到最终半豆荚杆质量符合要求。
[Abstract]:Advanced Pultrusion (ADP) technology is a high automation and low cost continuous forming method, which is very suitable for the preparation of super long composite pod rod. This paper is based on composite material. The semi bean pod rod is the research object. According to the defects of the surface fiber distortion, the step pattern and the insufficiency of the thickness of the semi bean pod rod made by the existing ADP technology, the pre treatment method is put forward, the pretreatment process parameters are determined, and the influence of the preprocessing technology on the performance of the parts is studied. Finally, the preprocessing method is used. The main work is as follows: (1) apply the flow model of resin and analyze the influence of various factors on the defects of the parts, and put forward the pre treatment plan, that is to preheat the prepreg before entering the hot pressing die, so as to make the prepreg in the prepreg. The resin takes place to reduce the flow of resin under pressure and eliminate the above defects. According to the requirement of the thickness of the semi bean pod rod, the pretreatment technology index is put forward by calculation. The loss mass fraction of the super thin prepreg resin is controlled in 2.3%. (2) for the DSC test and viscosity test of the resin system used. The pre treatment process required the processing efficiency, initially determined the temperature suitable for the pretreatment process: 100, 105, 110. Under the above temperature conditions, the resin flow in the ADP process was simulated by using the oven preheating and hot pressing device by hot pressing. The resin mass loss of pre prepreg before and after the test was 2.3% as the target. Three groups of pretreatment parameters of ADP process: 48min under 100 C, 42min under 105 C and 23min. (3) for heat preservation at 110 C (3), the same composite laminates with half pod paving layer are prepared by the above pretreatment process. The resin content, thickness, axial tensile properties and interlaminar tensile properties are tested. The results show that the pretreatment process is made. The resin content and thickness obtained were effectively controlled, the axial tensile properties and interlaminar tensile properties of the samples were not significantly reduced, indicating that the pretreatment technology met the actual requirements of the bean pods. (4) on the basis of the ADP equipment in the laboratory, a continuous forming preconditioning device was built, and the preconditioning at 100 degrees centigrade was pretreated. The semi bean pod rod was tested under the processing parameters. The surface fiber distortion of the prepared semi bean pods was eliminated, the step defect was obviously reduced and the thickness of the workpiece reached the design requirement. The axial tensile test and interlayer tensile test were carried out on the semi bean pods.
【学位授予单位】：南京航空航天大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：V46

【相似文献】