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Microscale finite element analysis for predicting effects of air voids on mechanical properties of single fiber bundle in composites

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Abstract

Air voids produced in the manufacturing process have significant influence on the mechanical performances of single fiber bundle in carbon fiber-reinforced composites. The microscale finite element model of fiber bundle with voids is developed to predict mechanical properties and failure mechanisms. The failure responses of fiber and matrix in bundle are initiated by the maximum stress and Stassi failure criteria. The sudden stiffness degradation law is adopted to capture brittle behaviors. Both available theoretical models for voids and non-voids are used to validate the numerical model without voids and with different percentages of voids including 0.15, 0.5, 1, 2, 3, 4 and 5%. Effects of void contents on stress–strain responses of bundle are studied. The matrix damage development is studied regarding transverse compression and out-of-plane shear loading. The micro-stress analysis of matrix and voids in three-RUC model under different loadings is performed. The simulated elasticity and strength properties correlate well with theoretical results for voids and non-voids. The strengths and moduli gradually decrease with increasing void contents except longitudinal properties. The stress concentrations of bundle are mainly influenced by the loading direction.

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Acknowledgements

The authors acknowledge the financial supports from the National Natural Science Foundation of China (No. 11402011). The financial supports from Fundamental Research Funds for the Central Universities (No. 201401390741) are also gratefully acknowledged.

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Authors and Affiliations

  1. State Key Laboratory of Advanced Design and Manufacturing for Vehicle Body, Hunan University, Changsha, 410082, Hunan, China

    Hongyong Jiang, Yiru Ren, Zhihui Liu & Songjun Zhang

  2. College of Mechanical and Vehicle Engineering, Hunan University, Changsha, 410082, Hunan, China

    Hongyong Jiang, Yiru Ren, Zhihui Liu & Songjun Zhang

Authors
  1. Hongyong Jiang
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  2. Yiru Ren
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  3. Zhihui Liu
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  4. Songjun Zhang
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Contributions

Yiru Ren was involved in research guidance, technological guidance, quality check of paper and writing level and final decision for submission. Hongyong Jiang was involved in survey, programming of user material, finite element modeling (preprocessing and post-processing), picture and data processing, stress and damage analysis of microscale fiber bundle model containing voids and writing of full text. Songjun Zhang was involved in part of work research, dealing of numerical computation error, programming study and numerical result discussion. Zhihui Liu was involved in numerical result discussion for microscale damage of fiber bundle.

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Correspondence to Yiru Ren.

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Jiang, H., Ren, Y., Liu, Z. et al. Microscale finite element analysis for predicting effects of air voids on mechanical properties of single fiber bundle in composites. J Mater Sci 54, 1363–1381 (2019). https://doi.org/10.1007/s10853-018-2928-6

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  • DOI: https://doi.org/10.1007/s10853-018-2928-6

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