Mitigating forming defects by local modification of dry preforms
Mitigating forming defects by local modification of dry preforms
复制标题
DOI：
10.1016/j.compositesa.2019.105643
复制
发表时间：
2020-01
期刊：
影响因子：
--
通讯作者：
Mark A. Turk;Brúnó Vermes;A. Thompson;J. Belnoue;S. Hallett;D. Ivanov
中科院分区：
文献类型：
--
作者：
Mark A. Turk;Brúnó Vermes;A. Thompson;J. Belnoue;S. Hallett;D. Ivanov
干燥纤维织物预成型件的成形是实现轻质复合结构的复杂形状的常用技术。大多数传统的工程织物只能通过剪切变形。过度的剪切通常会导致形成有害的特征，例如皱纹、褶皱和织物变形。本文表明，通过在关键区域对预成型件进行局部改性来提高成形性以增强成形性和减少缺陷的可行性。通过将局部树脂贴片印刷到纺织品预成型件上来实施修改。该技术允许纤维在整个预成型件中的连续性，具有额外的益处，即沉积的树脂可以被热分级到所需的固化水平，以调节用于成形和固结的区域的粘度。贴片的位置和尺寸通过数值建模指定，以通知后续的制造过程。制造试验成功地证明了使用这种技术减轻缺陷的可能性。
Forming of dry fibre textile pre-forms is a commonly used technique to achieve complex shapes for light weight composite structures. Most conventional engineering fabrics can only deform through shearing. Excessive shearing often results in the formation of detrimental features, such as wrinkles, folds and fabric distortions. This paper shows the feasibility of improving formability by local modification of preforms in critical areas to enhance forming and mitigate against defects. Modification is implemented by printing localised resin patches onto textile preforms. The technique allows for continuity of fibres throughout the preform with the additional benefit that the deposited resin can be thermally staged to the desired level of cure to tune the viscosity of the region for forming and consolidation. The location and dimensions of patches are specified through numerical modelling to inform the subsequent manufacturing process. Manufacturing trials successfully demonstrate the possibility of defect mitigation using this technique.