Citation: Guo-wei Zhu, Feng-de Ma, Yu-xi Jia, Peng Qu, Yun-li Guo, Xiao-chen Sun. Resin Matrix Shear Band and Its Special Effect on Stress Concentration of Fiber Composites[J]. Chinese Journal of Polymer Science, ;2014, 32(6): 703-710. doi: 10.1007/s10118-014-1442-9 shu

Resin Matrix Shear Band and Its Special Effect on Stress Concentration of Fiber Composites

Guo-wei Zhu ¹ ,
Feng-de Ma ¹ ,
Yu-xi Jia ^1,, ,
Peng Qu ¹ ,
Yun-li Guo ¹ ,
Xiao-chen Sun ¹

Corresponding author: Yu-xi Jia,
Received Date: 12 August 2013
Revised Date: 14 September 2013

Fund Project: 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).

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.
- Fiber composite,
- Stress concentration,
- Shear band,
- Fiber volume fraction,
- Theory and modeling
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