Comparative investigation of carbon fiber filaments in off-axis transverse cutting between flexible-support and non-support method under pre-tension
Comparative investigation of carbon fiber filaments in off-axis transverse cutting between flexible-support and non-support method under pre-tension
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预拉下碳纤维长丝柔性支撑与无支撑方式离轴横向切割对比研究
DOI：
10.1177/1558925019837812
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发表时间：
2019-01
影响因子：
2.9
通讯作者：
Hou Zhaorui
中科院分区：
文献类型：
--
作者：
Chen Yang;Lu Longsheng;Liu Xiaokang;Xie Yingxi;Wan Zhenping;Hou Zhaorui
短切碳纤维是复合材料领域中一种有效的、必不可少的增强材料。一般采用切碎工艺生产，其中压辊和槽轮是两种比较流行的切碎工艺。根据这两种技术的工作原理，压轮可以简化为离轴横向切割中的柔性支撑切割，而槽轮可以用无支撑切割来表示。为了揭示压辊和槽轮技术下碳纤维断裂的差异，采用自行设计的夹具，对比研究了单根碳纤维（也可简化为细丝）在柔性支撑和无支撑情况下的离轴横向切割断裂行为。对比分析了两种材料在切削过程中的切削力和纤维的断口形貌。结果表明，单根碳纤维在无支撑切割时的破坏是由拉伸效应引起的，而在柔性支撑切割时的破坏是由弯曲效应引起的。在低预张力下，采用柔性支撑的长丝切断力和切断深度明显低于无支撑的长丝切断力和切断深度。研究发现，在低预张力下，碳纤维丝在无支撑切割中的断裂点具有随机性。同时，在柔性支撑切割中，碳纤维丝的断裂点由刀片的尖端决定。通过综合比较，柔性支撑切割比无支撑切割更适合于短切碳纤维的生产。
Short carbon fiber is an effective and essential reinforced material in composite domains. Generally, it is produced by chopping technology, among which pressing roller and grooved wheel are two popular chopping techniques. According to the working principle of these two techniques, the pressing roller can be simplified as a flexible-support cutting in off-axis transverse cutting, meanwhile the grooved wheel can be represented by a non-support cutting. To reveal the fracture difference of carbon fiber between the pressing roller and the grooved wheel technique, comparative investigation of failure behavior between a single carbon fiber (also simplified as a filament) with flexible support and with non-support was performed in off-axis transverse cutting using a custom-designed fixture. Both the cutting force and the fracture surface of the filament were comparatively analyzed in cutting process. It was found that the failure of single carbon fiber was caused by tensile effect in a non-support cutting, whereas that in a flexible-support cutting was caused by bending effect. The cutting-off force and cutting-off depth of filament cut by use flexible support are significantly lower than that by use non-support under low pre-tension. It is interesting to find out that the failure spot of carbon fiber filament in non-support cutting under low pre-tension tends to occur randomly. Meanwhile, in a flexible-support cutting, the break point of carbon fiber filament is determined by the tip of the blade. After a comprehensive comparison, the flexible-support cutting is a prior selection to produce short carbon fibers compared with the non-support cutting.
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影响因子：
2.3
作者：
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