Compaction Behavior and Part Thickness Variation in Vacuum Infusion Molding Process
Compaction Behavior and Part Thickness Variation in Vacuum Infusion Molding Process
复制标题
真空灌注成型过程中的压实行为和零件厚度变化
DOI：
10.1007/s10443-011-9217-8
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发表时间：
2012
影响因子：
2.3
通讯作者：
Chaoyi Peng
中科院分区：
文献类型：
--
作者：
Jinshui Yang;Jiayu Xiao;J. Zeng;D. Jiang;Chaoyi Peng
在真空注射成型工艺（VIMP）中，由于该工艺的上模是柔性的，很难制造出尺寸公差小的复合材料零件。在真实的VIMP条件下，实验研究了5种织物的静态和循环压实响应，以及压实压力、压实时间、压实周期和织物层数的影响。所有织物的静力和循环压实响应遵循不同的幂律模型，所得纤维体积分数和松弛系数随层数的增加而增加。虽然所得纤维体积分数随层数的增加而增加，但所有织物中10层至100层复合零件的纤维体积分数变化小于2.5%。利用千分尺对复合材料零件的厚度进行了监测和测量，并研究了加工参数对零件最终厚度的影响。在VIMP中，在预填充、填充和后填充阶段，零件厚度随空间坐标和时间的变化而变化。加工参数对零件厚度的变化和最终值有很大的影响。统计结果表明，在真空压实压力为0.08 MPa的VIMP条件下，最终零件厚度相当于干燥预制件的厚度。成品纤维体积分数与干燥预制体纤维体积分数相差2% ~ 5.7%。
In vacuum infusion molding process (VIMP), it is difficult to manufacture a composite part with small dimensional tolerance, since the upper mold for the process is flexible. In this study, the static and cyclic compaction responses of five kinds of fabrics were experimentally studied under real VIMP conditions, with the effects of compaction pressure, compaction time, compaction cycle and number of the fabric layers. The static and cyclic compaction responses of the all fabrics follow different power law models and the resulting fiber volume fraction and relaxation factor increase with the number of layers. Although the resulting fiber volume fraction increases with the layer numbers, change of the fiber volume fraction of the composite parts with 10 layers to 100 layers of the all fabrics is less than 2.5%. The thickness of the composite part was monitored and measured using micrometer gauges, and the effects of processing parameters on the final thickness of part was investigated. The part thickness varies as a function of spatial coordinates and time during pre-filling, filling and post-filling stages in VIMP. The variation and the final value of the part thickness would be significantly affected by the processing parameters. Statistical results show that the final part thickness is equivalent to the thickness of the dry preform under the 0.08 MPa vacuum compaction pressure in VIMP. The difference between the fiber volume fraction of the final part and that of the dry preform is 2% ~ 5.7%.