That's how the preform crumples: Wrinkle creation during forming of thick binder-stabilised stacks of non-crimp fabrics
That's how the preform crumples: Wrinkle creation during forming of thick binder-stabilised stacks of non-crimp fabrics
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这就是预成型件起皱的方式：在厚的粘合剂稳定的无卷曲织物堆叠成型过程中产生皱纹
DOI：
10.1016/j.compositesb.2024.111269
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发表时间：
2024
期刊：
影响因子：
12.8
通讯作者：
Broberg P
中科院分区：
文献类型：
--
作者：
Broberg P
多层织物的同时成形在工业中用于增加复合材料部件的产量。聚合物粘合剂可用于稳定织物层以使其更容易处理，然而，粘合剂也可限制相对纤维移动，这可导致成形期间的褶皱。尽管在风力工业中使用粘合剂稳定的预成型件的兴趣越来越大，但在成型过程中产生的缺陷几乎没有被研究。本研究调查了在成型过程中粘合剂稳定的预成型件（层间聚合物粘合剂稳定的干燥无卷曲织物层）中的纤维缠结。从实验活动的结果，其中全厚度预固结预制件试样正在形成两个不同的斜坡几何形状。在成形过程中，在过渡边缘处观察到褶皱。为了帮助皱纹机制的讨论，提出了一个数值模型，使用连续壳元建模的NCF和建模的界面的凝聚力法。该模型能够预测起皱的起始和起皱的位置，并可用于研究预成形件的成形性。
The simultaneous forming of multiple layers of fabric is being used in industry to increase the throughput of composite parts. A polymeric binder may be used to stabilise the fabric layers to make it easier to handle, however, the binder may also restrict relative fibre movement, which may lead to wrinkles during forming. Despite the increasing interest in using binder-stabilised preforms in the wind industry, defects arising during forming have scarcely been investigated. This study investigates fibre wrinkling in binder-stabilised preforms (layers of dry non-crimp fabric stabilised with an interply polymeric binder) during forming. The results from an experimental campaign are presented, in which full-thickness pre-consolidated preform specimens are being formed over two different ramp geometries. Wrinkles are observed at the transition edges during forming. To aid the discussion on wrinkle mechanisms, a numerical model is presented that uses continuum shell elements for modelling the NCFs and a cohesive law for modelling the interface. This model is capable of predicting the wrinkle onset and wrinkle location and may be used to study the formability of the preform.