An experimental investigation on damage mechanisms of thick hybrid composite structures under flexural loading using multi-instrument measurements
An experimental investigation on damage mechanisms of thick hybrid composite structures under flexural loading using multi-instrument measurements
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DOI：
10.1016/j.ast.2021.106921
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发表时间：
2021-07-19
影响因子：
5.6
通讯作者：
Yildiz, M.
中科院分区：
文献类型：
--
作者：
Gul, S.;Tabrizi, I. E.;Yildiz, M.
在这项研究中，厚碳/玻璃纤维增强混杂复合材料的损伤表征进行弯曲载荷条件下，通过两个无损评价（NDE）技术，即，数字图像相关（DIC）和声发射（AE）。实验结果表明，混杂复合材料的弯曲模量与碳纤维铺层的位置密切相关，碳纤维铺层越靠近层合板表面，弯曲模量越高。另一方面，弯曲强度取决于层合板中损伤起始的类型和程度。碳纤维增强复合材料（CFRP）与玻璃纤维的层间混杂不仅可以提高其弯曲强度和破坏应变，而且可以提高CFRP的破坏可预测性。DIC技术有效地捕捉到了与厚混合层合板中各种失效模式相关的横向应变和剪切应变。此外，AE结果表明，与声活动的发生相关的应变水平与混合层压板的碳纤维层中的失效有关。此外，DIC和AE对厚混合层合板的这些观察结果与光学断口相证实。最后，揭示了铺层顺序和层合板厚度显著改变混杂复合材料的力学性能和损伤机制。(C)2021 Elsevier Masson SAS。All rights reserved.
In this study, damage characterization of thick carbon/glass fiber reinforced hybrid composites is performed under flexural loading conditions via two non-destructive evaluation (NDE) techniques, i.e., digital image correlation (DIC) and acoustic emission (AE). Experimental results demonstrate that the flexural modulus of the hybrid composites is strongly correlated with the location of carbon fiber plies; the closer these plies are to the laminate faces, the higher is the modulus. On the other hand, the flexural strength depends on the type and extent of damage initiation in the laminates. Interply hybridization of carbon fiber reinforced composites (CFRPs) with glass fiber not only improves their flexural strength and failure strain but also facilitates failure predictability in CFRPs. The transverse and shear strains associated with various failure modes in thick hybrid laminates are efficiently captured by the DIC technique. In addition, AE results reveal that the strain levels associated with the onset of acoustic activity are linked to failure in the carbon fiber plies of the hybrid laminates. Furthermore, these observations made by DIC and AE on thick hybrid laminates are confirmed with optical fractography. Finally, it is revealed that ply lay-up sequence and laminate thickness notably alter both the mechanical performance and damage mechanisms of hybrid composites. (C) 2021 Elsevier Masson SAS. All rights reserved.