Research Papers

Nonlinear Viscoelastic Behavior of Active Fiber Composites

[+] Author and Article Information
Vahid Tajeddini, Anastasia Muliana

Mechanical Engineering Department,
Texas A&M University,
College Station, TX 77843

Hassene Ben Atitallah, Zoubeida Ounaies

The Electroactive Materials
Characterization Laboratory,
Department of Mechanical
and Nuclear Engineering,
Pennsylvania State University,
University Park,
State College, PA 16801

Contributed by the Materials Division of ASME for publication in the JOURNAL OF ENGINEERING MATERIALS AND TECHNOLOGY. Manuscript received October 3, 2013; final manuscript received January 8, 2014; published online February 5, 2014. Assoc. Editor: Hanchen Huang.

J. Eng. Mater. Technol 136(2), 021005 (Feb 05, 2014) (8 pages) Paper No: MATS-13-1181; doi: 10.1115/1.4026474 History: Received October 03, 2013; Revised January 08, 2014

In the present study, viscoelastic response of an active fiber composite (AFC) is investigated by conducting stress relaxation and creep deformation tests, and the quasi-linear viscoelastic (QLV) constitutive model is used to describe the viscoelastic response of the AFC. The AFC under study consists of unidirectional long piezoelectric ceramic fibers embedded in an epoxy polymer, encapsulated between two Kapton layers with interdigitated surface electrodes. The relaxation and creep experiments are performed by loading the AFC samples along the longitudinal axis of the fibers, under several strain and stress levels at three temperatures, namely 25 °C, 50 °C, and 75 °C. The experimental results reveal the nonlinear viscoelastic behavior of the composite. Next, simulation and prediction of the viscoelastic response, including stress relaxation and creep deformation of the material, are done by using semi-analytical QLV model in which a relaxation time-dependent function is used, which also depends on strain and temperature. The results from the model are compared with those from the experiments. In general, the experimental and simulation results are in good agreement, except in the case of some of the creep responses, where considerable discrepancies are seen between the experimental and analytical approaches. Possible reasons for these differences are discussed in details.

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Fig. 3

Response of AFC at different strain levels at T = 25 °C

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Fig. 1

An AFC sample, manufactured by Advanced Cerametrics Incorporated

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Fig. 9

Creep response at room temperature and different stress levels

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Fig. 2

Schematic of an AFC

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Fig. 6

Stress relaxation response at room temperature (T = 25 °C) and different strain levels

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Fig. 7

Stress relaxation response at T = 50 °C and different strain levels

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Fig. 8

Stress relaxation response at T = 75 °C and different strain levels

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Fig. 10

Creep response at T = 50 °C and different stress levels

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Fig. 11

Creep response at T = 75 °C and different stress levels

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Fig. 4

A part of master curve at T = 75 °C obtained by shifting the response from T = 50 °C

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Fig. 5

Convergence studies: the effect of error tolerance (top) and the effect of time increment (bottom) on the overall creep response



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