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On the influence of glass fiber mat on the mixed-mode fracture of composite-to-metal bonded joints

机译：玻璃纤维垫对复合物与金属粘合接头混合模式骨折的影响

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In this work, the influence of a layer of glass fiber mat (GFM) inserted in a bi-material bonded joint interface is investigated as a toughening mechanism to improve the fracture performance of bonded structures. Composite to-metal bonded specimens were manufactured by hand lay-up using two different consolidation processes: at room pressure or using vacuum bagging. The fracture behavior was evaluated under quasi-static loadings using the mixed-mode bending (MMB) test. Test results revealed an increase of the fracture toughness with the insertion of an adjacent layer of GFM. The toughening mechanism is associated with a more irregular fracture surface profile. It was verified a relationship between the fracture surface roughness and the fracture toughness. The toughening effect showed to be more evident in higher mode II fracture conditions. The insertion of a layer of GFM and the use of vacuum pressure in the consolidation of the composite increase the fracture performance of composite repairs in metal structures.
机译：在这项工作中，将插入在双材料键合接头界面中的玻璃纤维垫（GFM）的影响作为增韧机制，以改善粘合结构的断裂性能。使用两种不同的合并工艺通过手工铺设制造复合金属键合标本：在室内压力或使用真空袋上。使用混合模式弯曲（MMB）测试在准静态载荷下评估断裂行为。测试结果表明，插入相邻的GFM层的裂缝韧性增加。增韧机构与更不规则的裂缝表面轮廓有关。验证了断裂表面粗糙度与断裂韧性之间的关系。增韧效果显示在较高模式II裂缝条件下更明显。在复合材料固结中插入GFM层和真空压力的使用增加了金属结构中复合材料修复的断裂性能。

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