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Resin matrix shear band and its special effect on stress concentration of fiber composites

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Abstract

A constitutive model is constructed to consider the resin matrix post-yield softening and progressive hardening behaviors. A user-defined material mechanical behavior (UMAT) subroutine is created, then the non-linear three-dimensional finite element analysis on the tensile processes of multi-fiber composites is conducted. The approximate 45° shear bands emanating from the matrix crack tip are found, being coincided with the experimental observations. The shear stress on the adjacent intact fiber/matrix interface is strongly influenced by the shear band and thus the stress concentration factor (SCF) changes obviously in the adjacent fibers. The distinct stress redistribution in the adjacent intact fibers implies the significant effect of the shear bands on the progressive fiber fracture initiation. As the inter-fiber spacing increases, the peak value of the SCF in the adjacent intact fiber decreases, whereas the overload zone becomes wider. The research has provided a helpful tool to evaluate the failure of fiber composites and optimize the composite performance through the proper selection of resin matrix properties and fiber volume fraction.

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Authors and Affiliations

  1. Key Laboratory for Liquid-Solid Structural Evolution & Processing of Materials (Ministry of Education), Shandong University, Jinan, 250061, China

    Guo-wei Zhu, Feng-de Ma, Yu-xi Jia  (贾玉玺), Peng Qu, Yun-li Guo & Xiao-chen Sun

Authors
  1. Guo-wei Zhu
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  2. Feng-de Ma
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  3. Yu-xi Jia  (贾玉玺)
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  4. Peng Qu
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  5. Yun-li Guo
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  6. Xiao-chen Sun
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Corresponding author

Correspondence to Yu-xi Jia  (贾玉玺).

Additional information

This work was financially supported by the National Key Basic Research Program of China (No. 2010CB631102), the National Natural Science Foundation of China (Nos. 51173100 and 51373090), and the Natural Science Foundation of Shandong Province (No. JQ201016).

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Zhu, Gw., Ma, Fd., Jia, Yx. et al. Resin matrix shear band and its special effect on stress concentration of fiber composites. Chin J Polym Sci 32, 703–710 (2014). https://doi.org/10.1007/s10118-014-1442-9

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  • DOI: https://doi.org/10.1007/s10118-014-1442-9

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