Abstract
Effects of various chopped fiber (CF) interleaves, including CF type, CF length, and interleave areal density on mode I interlaminar toughening for flax fiber reinforced composites were studied via the double cantilever beam (DCB) experiment and simulation. The CF interleaved flax/epoxy composites were made by interleaving CFs randomly and uniformly in the mid-layer. A numerical model subject to the experiment was established involving the trilinear cohesive zone model (CZM) characterized by five parameters. The mode I interlaminar fracture toughness (GIC) was furthest improved up to 2.322 kJ/m2 by 80.7% using carbon CF interleave with 5 mm CF length and 25 g/m2 areal density. The toughening mechanisms related to fiber bridging and flax multi-layer failure were discussed regarding different CF interleaves. Comparative analysis of numerical and experimental results revealed the quantitative relation between CZM parameters and CF interleave properties, providing guidance for designing CF interlaminar toughening.
摘要
本文分别通过双悬臂梁(DCB)实验与数值模拟, 研究了不同短纤维插层(包括短纤维种类、 短纤维长度与插层面密度)对亚麻纤维增强复合材料I型层间断裂韧性的影响规律. DCB试验结果表明, 当插层为5 mm长度、 25 g/m2面密度的短碳纤维插层时, 复合材料I型层间断裂韧性达到2.322 kJ/m2, 取得最大提升幅度80.7%, 短纤维桥联与亚麻连续纤维多层级破坏为其主要增韧机理. 在此基础上, 采用五参数控制的三线性内聚力单元, 建立了数值仿真模型. 实验与数值模拟结果的对比分析揭示了短纤维插层属性与内聚力模型参数之间的定量关系, 可为植物纤维增强复合材料短纤维插层增韧设计提供参考依据.
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Acknowledgements
This work was supported by the National Natural Science Foundation of China (Grant No. 12132011).
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Author contributions Benze Yu: Conceptualization, Data curation, Formal analysis, Investigation, Methodology, Software, Validation, Visualization, Writing–original draft. Yan Li: Conceptualization, Funding acquisition, Project administration, Resources, Supervision, Writing–review & editing. Haoyun Tu: Data curation, Software, Validation. Zhongsen Zhang: Validation, Visualization, Writing–review & editing.
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Appendix
Table S1
Values of numerical parameters in trilinear CZM for comparison on the effect of cohesive stiffness and cohesive strength
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Yu, B., Li, Y., Tu, H. et al. Experimental and numerical investigation into interlaminar toughening effect of chopped fiber-interleaved flax fiber reinforced composites. Acta Mech. Sin. 40, 423287 (2024). https://doi.org/10.1007/s10409-023-23287-x
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DOI: https://doi.org/10.1007/s10409-023-23287-x