Toughening of face-sheet core bonds in sandwich structures
Toughening of face-sheet core bonds in sandwich structures
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DOI：
10.1016/j.engfracmech.2023.109498
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发表时间：
2023-07-26
影响因子：
5.4
通讯作者：
Dear，John P.
中科院分区：
文献类型：
--
作者：
Irven，George;Whitehouse，Adam;Dear，John P.
研究了在夹层结构中改善泡沫芯材与碳纤维面板之间粘结韧性的方法。动平台上的单悬臂梁(SCB)被确定为一种合适的I型主导试验方法。在泡沫中引入机械加工槽后，表面-板材-芯材粘结的测量韧性提高了50%。通过核壳橡胶粒子对面片的增韧，导致断裂轨迹从界面变为泡沫。还发现，使用芳纶纤维增强泡沫作为夹层的核心，可以将界面粘结韧性提高高达50%。随着裂纹的扩展，纤维增强泡沫促进了R曲线行为的出现。
Methods of improving the toughness of the bond between a foam core and a carbon fibre face-sheet in a sandwich structure were investigated. The Single Cantilever Beam (SCB) on a travelling platform was identified as an appropriate mode-I dominant test-method. The introduction of machined grooves in the foam resulted in a 50% improvement in the measured toughness of the face-sheet-core bond. Toughening of the face-sheets via core–shell rubber particles resulted in a change in fracture locus away from the interface and into the foam. The use of aramid fibre-reinforced foam as the core of the sandwich was also found to improve the interface bond toughness by up to 50%. The fibre-reinforced foams promoted the emergence of R-curve behaviour as the crack propagated.