PDF(Pubmed)
Abstract：
Glass fiber-reinforced polymer (GFRP) laminates are used in many applications because of their availability, high mechanical properties, and cost-effectiveness. Fiber defects in the form of waviness or wrinkles can occur during the production of multilayered laminates. When curved laminates of significant thickness are produced, the likelihood of such defects increases. Studies have confirmed that fiber deformation during manufacture leads to a reduction in the mechanical properties of laminates. Therefore, early detection of such defects is essential. The main part of this paper deals with research into the possibility of using active infrared thermography to detect wrinkles in curved multilayered GFRP laminates. The size of the artificial wrinkles was assessed by analyzing scans and microimages. The shape deformations of the samples were evaluated by comparing the samples with the mold and the assumed nominal shape. The influence of the out-of-autoclave manufacturing process on the reduction in wrinkles formed without significantly affecting the internal structure of the laminate is presented in this work. This research demonstrated the ability to detect wrinkles in thick curved laminates using active infrared thermography. However, it also showed how the interpretation of the thermographic results is affected by the curvature of the structure, the lack of uniform heating, and the configuration of the thermographic setup.
摘要：
玻璃纤维增强聚合物（GFRP）层压板由于其可用性而在许多应用中使用，高机械性能，和成本效益。在多层层压材料的生产过程中会出现波纹或褶皱形式的纤维缺陷。当生产具有显著厚度的弯曲层压板时，这种缺陷的可能性增加。研究已经证实,制造过程中的纤维变形导致层压材料的机械性能降低。因此,这些缺陷的早期检测是至关重要的。本文的主要部分涉及使用主动红外热成像技术检测弯曲多层GFRP层压板中皱纹的可能性的研究。通过分析扫描和显微图像来评估人工皱纹的大小。通过将样品与模具和假定的标称形状进行比较来评估样品的形状变形。在这项工作中提出了高压釜外制造工艺对减少形成的褶皱而不会显着影响层压板的内部结构的影响。这项研究证明了使用主动红外热成像技术检测厚弯曲层压板中皱纹的能力。然而,它还显示了热成像结果的解释如何受到结构曲率的影响，缺乏均匀的加热，和热成像装置的配置。
