Impact of Stitching Processes on the Compaction Behavior of Glass Fiber Reinforcements
Impact of Stitching Processes on the Compaction Behavior of Glass Fiber Reinforcements
复制标题
缝合工艺对玻璃纤维增强材料压实行为的影响
DOI：
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发表时间：
2006
期刊：
影响因子：
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通讯作者：
S. Bickerton
中科院分区：
文献类型：
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作者：
M. Floeck;H. Stadtfeld;P. Mitschang;S. Bickerton
本研究的目的是探讨缝合技术对三种不同玻璃纤维半成品预成型件的压缩和松弛行为的影响。特别注意缝合参数的影响（即，线张力和接缝间距）和压实过程（单阶段对多阶段）对实验结果的影响。试验证明，单级压实与多级压实没有区别。此外，它示出的预成型件的缝合导致由于额外的体积的线被压实的压实力的增加。比较高和低的线张力揭示了增加的线张力导致预成型件的预压实，从而降低了所需的压实力，尽管预压实的程度似乎被限制在一个极限，在该极限以上不能再观察到压实力的降低。关于接缝的间距，事实证明，与未缝合的预制件相比，仅窄间距（5mm）对压实具有显著影响，而宽间距（20mm）不会导致压实行为的显著变化。最后，在压实和松弛过程中的预制件的目视检查表明，预制件表面的形态变化是一个非常复杂的现象，不能很容易地建模。在松弛过程中没有观察到预制件表面的视觉变化。因此，它被认为是松弛所造成的不可见的微观结构重新取向的玻璃长丝内的单粗纱。
The objective of this project is to investigate the application influences of stitching techniques on the compaction and relaxation behavior of preforms made of three different semi-finished glass fabric types. Particular attention is directed to the impact of stitching parameters (i.e., thread tension and seam spacing) and the compaction procedure (single-stage vs multi-stage) on the experimental results. The experiments prove that there is no difference between single-stage and multi-stage compaction. Furthermore, it is shown that the stitching of the preforms leads to an increase in compaction force due to the additional volume of thread to be compacted. Comparing high and low thread tension reveals that an increasing thread tension causes pre-compaction of the preform, thus reducing the required compaction force, though the degree of pre-compaction seems to be confined to a limit above which no reduction in compaction force can be observed any more. Regarding the spacing of the seams, it turns out that only the narrow spacing (5 mm) has a significant influence on compaction, whereas the wide spacing (20 mm) does not lead to a notable change in compaction behavior compared to the unstitched preforms. Finally, visual inspection of the preforms during compaction and relaxation shows that the morphologic change of the preform surfaces is a very complex phenomenon which cannot easily be modeled. No visual change of the preform surfaces are observed during relaxation. Therefore, it is assumed that relaxation is caused by invisible microstructural reorientation of glass filaments within single rovings.