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Research Papers

Temperature-Dependent Interfacial Debonding and Frictional Behavior of Fiber-Reinforced Polymer Composites

[+] Author and Article Information
Qiyang Li

State Key Laboratory of Fluid Power & Mechatronic System,
Key Laboratory of Soft Machines and Smart Devices of Zhejiang Province,
Department of Engineering Mechanics,
Zhejiang University,
Hangzhou 310027, China
e-mail: liqy999@zju.edu.cn

Guodong Nian

State Key Laboratory of Fluid Power & Mechatronic System,
Key Laboratory of Soft Machines and Smart Devices of Zhejiang Province,
and Department of Engineering Mechanics,
Zhejiang University,
Hangzhou 310027, China
e-mail: gnian@zju.edu.cn

Weiming Tao

State Key Laboratory of Fluid Power & Mechatronic System,
Key Laboratory of Soft Machines and Smart Devices of Zhejiang Province,
and Department of Engineering Mechanics,
Zhejiang University,
Hangzhou 310027, China
e-mail: Taowm@zju.edu.cn

Shaoxing Qu

State Key Laboratory of Fluid Power & Mechatronic System,
Key Laboratory of Soft Machines and Smart Devices of Zhejiang Province,
and Department of Engineering Mechanics,
Zhejiang University,
Hangzhou 310027, China
e-mail: squ@zju.edu.cn

1Corresponding authors.

Contributed by the Applied Mechanics Division of ASME for publication in the Journal of Applied Mechanics. Manuscript received May 30, 2019; final manuscript received June 5, 2019; published online June 27, 2019. Assoc. Editor: Yonggang Huang.

J. Appl. Mech 86(9), 091010 (Jun 27, 2019) (8 pages) Paper No: JAM-19-1273; doi: 10.1115/1.4044017 History: Received May 30, 2019; Accepted June 05, 2019

As fiber-reinforced polymer matrix composites are often cured from stress-free high temperature, when subjected to ambient temperature, both the mismatch of the coefficient of linear thermal expansion between the fiber and the matrix and the dependence of material properties on temperature will influence the interfacial behavior. Thus, it is necessary to provide an insight into the mechanism of temperature effects on the thermomechanical properties and behaviors along the interface. In this work, we conducted microbond tests of the glass fiber–epoxy material system at controlled testing temperature (Tt). A modified interface model is formulated and implemented to study the interfacial decohesion and frictional sliding behavior of microbond tests at different Tt. With proper cohesive parameters obtained, the model can predict temperature-dependent interfacial behaviors in fiber-reinforced composites. Both the slope of the peak force as well as the measured force at the stage of frictional sliding decrease with Tt in a wide range of the length of microdroplet-embedded fiber (le). The interfacial shear strength (IFSS) keeps almost constant at Tt ≤ 40 °C and decreases with le when temperature is above 40 °C. The average frictional stress (τfAverage) along the interface increases with le when temperature is below 80 °C but is almost constant when temperature is above or equal to 80 °C. Overall, in the same range of le, τfAverage is greater when Tt is at low temperature.

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Figures

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Fig. 3

The proposed cohesive zone model

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Fig. 2

The photograph of the gripper, positioning stage, and blades for microbond tests

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Fig. 1

(a) The photograph of an in-house developed tester for the microbond test under different temperatures. (b) The photograph of a high magnification specially developed apparatus and the controlled temperature chamber. (c) The schematic of the specially developed apparatus for the microbond test.

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Fig. 4

The coefficient of linear thermal expansion of the epoxy at different temperatures

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Fig. 5

Microbond tests for the glass fiber/epoxy matrix system at different temperatures: (I) 25.6 °C, (II) 40 °C, (III) 60 °C, (IV) 80 °C, (V) 100 °C, and (VI) 120 °C. Photographs of samples before (a) and after (b) microbond tests, and the corresponding force–displacement curves (c).

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Fig. 6

The typical case of the microbond test for the glass/epoxy system (i.e., le = 175.43 μm and Tt = 40 °C)

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Fig. 7

Fmax versus le from microbond tests at different temperatures for the glass fiber/epoxy matrix system

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Fig. 8

Ff versus le from microbond tests at different temperatures for the glass fiber/epoxy matrix system

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Fig. 9

IFSS versus le from microbond tests at different temperatures for the glass fiber/epoxy matrix system

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Fig. 10

τfAverage versus le from microbond tests at different temperatures for the glass fiber/epoxy matrix system

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