In-situ observation of microscopic damage in adhesively bonded CFRP joints under mode I and mode II loading
In-situ observation of microscopic damage in adhesively bonded CFRP joints under mode I and mode II loading
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DOI：
10.1016/j.compstruct.2019.111330
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发表时间：
2019-11
影响因子：
6.3
通讯作者：
Sota Oshima;A. Yoshimura;Y. Hirano;T. Ogasawara;K. Tan
中科院分区：
文献类型：
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作者：
Sota Oshima;A. Yoshimura;Y. Hirano;T. Ogasawara;K. Tan
研究了碳纤维增强复合材料（CFRP）结构胶接接头的微观破坏机理，并对I型和II型载荷下的断裂韧性试验进行了原位观察。通过将数字图像相关（DIC）方法应用于显微照片来定量评估粘合剂层中的应变。在I型载荷作用下，沿CFRP/胶粘剂界面观察到沿着应变集中。另一方面，在模式II加载下，观察到聚酯载体周围的应变集中和微裂纹。宏观裂纹扩展是由于模式II载荷下的微裂纹的合并而发生的。粘接树脂在裂纹扩展开始时的模式II加载下的最大主应变显着大于模式I加载下。利用X射线计算机断层扫描技术研究了试样边缘距离对裂纹扩展行为的影响。
Microscopic failure mechanisms in adhesively bonded joints of carbon fiber reinforced polymer (CFRP) structures were studied, and in-situ observation during fracture toughness tests under mode I and mode II loading were carried out. Strain in the adhesive layer was quantitatively evaluated by applying the digital image correlation (DIC) method to micrographs. Strain concentration was observed along the CFRP/adhesive interface under mode I loading. On the other hand, strain concentration and microcracks around the polyester carrier was observed under mode II loading. The macroscopic crack growth occurred due to the coalescing of microcracks under mode II loading. The maximum principal strain in adhesive resin under mode II loading at the onset of crack growth was significantly larger than that under mode I loading. The effects of distance from specimen edge on the crack growth behavior were also studied using the X-ray computed tomography.