Towards quasi isotropic laminates with engineered fracture behaviour for industrial applications
Towards quasi isotropic laminates with engineered fracture behaviour for industrial applications
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DOI：
10.1016/j.compscitech.2018.07.004
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发表时间：
2018-09
影响因子：
9.1
通讯作者：
G. Bullegas;J. Benoliel;Pier Luigi Fenelli;S. Pinho;S. Pimenta
中科院分区：
文献类型：
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作者：
G. Bullegas;J. Benoliel;Pier Luigi Fenelli;S. Pinho;S. Pimenta
在正交层（CP）和准各向同性（QI）薄层CFRP层合板的微观结构中插入了精心布置的微切口图案，以设计其跨层断裂行为，目的是提高其在不同载荷条件下的抗损伤能力。提出了一种新的有限断裂力学模型，用于预测跨层裂纹的扩展行为，指导组织设计。这种技术导致了68%的层压缺口强度增加，和460%的增加，在紧凑的拉伸试验的CP层压板的层压translaminar断裂工作。它还允许实现27%的层压板缺口强度增加，并在QI层压板的紧凑拉伸试验过程中的跨层断裂功增加189%。此外，在QI层压板的准静态压痕试验中，总能量耗散增加了43%，完全失效时的最大挠度增加了40%。考虑到在不同载荷条件下的力学性能的显著改善，QI层压板的工业相关性以及对薄层层压板的工业兴趣的增加，这些结果表明，微结构设计可以有效地用于提高CFRP结构在工业相关应用中的损伤容限。
Carefully placed patterns of micro-cuts have been inserted in the microstructure of Cross-Ply (CP) and Quasi-Isotropic (QI) thin-ply CFRP laminates to engineer their translaminar fracture behaviour with the purpose of increasing their damage resistance under different loading conditions. A novel Finite Fracture Mechanics model has been developed to predict the translaminar crack propagation behaviour and to guide the microstructure design. This technique led to a 68% increase in the laminate notched strength, and a 460% increase in the laminate translaminar work of fracture during Compact Tension tests for CP laminates. It also allowed to achieve a 27% increase in the laminate notched strength, and a 189% increase in the translaminar work of fracture during Compact Tension tests for QI laminates. Furthermore, an increase of 43% in the total energy dissipated, and of 40% in maximum deflection at complete failure was achieved during quasi-static indentation tests on QI laminates. Given the significant improvements in the mechanical performance under different loading conditions, and the industrial relevance of QI laminates and the increasing industrial interest in thin-ply laminates, these results demonstrate that microstructure design can be used effectively to improve the damage tolerance of CFRP structures in industrially-relevant applications.