不同通道中气泡的形态变化及运动条件分析

Bubble transfiguration and moving condition in different channels

孔隙是影响复合材料性能的主要因素之一,为了消除孔隙,提高产品质量,对复合材料成型过程中气泡运动特性的研究是十分必要的.利用预浸料片层模拟系统,考察了气泡在不同运动通道中穿出的形态变化过程;分析了外加压力、树脂粘度、气泡大小、网格面积等因素对气泡穿出行为的影响;同时提出了气泡穿出的约束条件.研究结果表明,随着树脂粘度的增加,气泡体积和空隙面积的减少,气泡穿出所需的临界压力将逐渐增大.该研究结果将为热压成型过程中气泡运动模型的建立提供实验依据.

Void is one of the most important factors which affects performances of composites. The void problem is generic to most polymer composite process, regardless of whether the matrix is a thermosetting or a thermoplastics matrix. In order to eliminate porosity and promote product quality, it is essential to study the bubble traversing behavior during composites manufacturing. Using the laminate simulation systems, the configuration changing process of bubbles under different traversing channels was investigated preliminarily. Then the main factors affecting bubble traversing behavior were studied respectively, such as the bubble volume, the resin viscosity and the inter-space size. Finally the kinematic conditions for bubble traversing were also proposed. The experimental results showed that the external pressure needed for bubble traversing in the woven layers would increase with the increase in resin viscosity, the decreasing of bubble diameter and the inter-space area. These results will provide expcrimental bases for the establishment of bubble movement model in hot-compaction process.