纤维束拉伸件几何尺寸对界面横向拉伸强度影响分析

doi:10.11896/cldb.22120125

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Abstract The interface between fiber and matrix has a great influence on the mechanical properties and durability of composites. Compared with conventional interfacial test methods to obtain the interfacial shear strength (IFSS), the interfacial strength in transverse tension measured by transverse fiber bundle stretching test can visually reflect the interfacial properties between fiber bundles and resin, independent of the microstructure of the fiber, and is an important parameter required for the performance prediction of RTM-molded 3D woven composites. In thiswork, a finite element model of transverse fiber bundle tensile specimen is established to analyze the transverse stress distribution and damage mode at the interface, considering the difference of thermal expansion coefficient between fiber and resin and the effect of resin curing shrinkage. Then the transverse tensile specimens of carbon fiber bundle reinforced epoxy resin were prepared by RTM process, and the results verified the accuracy of the model. The results were compared with different transverse tensile specimen forms in terms of stress state at the interface. The results show that the cross-shaped specimens can effectively improve the stress concentration at the edges, and the stresses are uniform in the central region of the interface. In that case, the transverse tensile strengths obtained are more accurate. The article also discusses the influence of cha-racteristic dimensions such as the width and length of the projecting end of the cross-shaped specimen and the type of reinforcing fibers on the test results. When selecting fiber bundle transverse tensile specimens, to obtain a more accurate interfacial transverse tensile strength, the width of the protruding end of the specimen should be as large as possible, but needs to be less than half of the total length of the protruding end to achieve the desired damage pattern.

Key words： fiber-reinforced composites fiber bundles interface transverse tensile strength

Published: 25 May 2024 Online: 2024-05-28

CLC number:

V258+.3

Fund:Natural Science Foundation of Shanghai (19ZR1462400).

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	Articles by authors
	XU Wenzhuo
	LI Wenxiao
	SU Zhaoyang
	SHI Qizhen

Cite this article:

XU Wenzhuo,LI Wenxiao,SU Zhaoyang, et al. Analysis of the Influence of the Fiber Bundle Stretchers’ Geometric Dimensions on the Transverse Tensile Strength of the Interface[J]. Materials Reports, 2024, 38(10): 22120125-9.

URL:

http://www.mater-rep.com/EN/10.11896/cldb.22120125 OR http://www.mater-rep.com/EN/Y2024/V38/I10/22120125

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