The cold-drawn, programmed shape memory polymer (SMP) fibers show excellent stress recovery property, which promotes their application as mechanical actuators in smart material systems. A full understanding of the thermomechanical-damage responses of these fibers is crucial to minimize the trial-and-error manufacturing processes of these material systems. In this work, a multiscale viscoplastic-viscodamage theory is developed to predict the cyclic mechanical responses of SMP fibers. The proposed viscoplastic theory is based on the governing relations for each of the individual microconstituents and establishes the microscale state of the stress and strain in each of the subphases. These microscale fields are then averaged through the micromechanics framework to demonstrate the macroscale constitutive mechanical behavior. The cyclic loss in the functionality of the SMP fibers is interpreted as the damage process herein, and this cyclic loss of stress recovery property is calibrated to identify the state of the damage. The continuum damage mechanics (CDM) together with a thermodynamic consistent viscodamage theory is incorporated to simulate the damage process. The developed coupled viscoplastic-viscodamage theory provides an excellent correlation between the experimental and simulation results. The cyclic loading-damage analysis in this work relies on the underlying physical facts and accounts for the microstructural changes in each of the micro constituents. The established framework provides a well-structured method to capture the cyclic responses of the SMP fibers, which is of utmost importance for designing the SMP fiber-based smart material systems.
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January 2013
Research-Article
Cyclic Viscoplastic-Viscodamage Analysis of Shape Memory Polymers Fibers With Application to Self-Healing Smart Materials
Amir Shojaei,
Amir Shojaei
Postdoctoral Research Associate
Department of Mechanical Engineering,
Louisiana State University,
Baton Rouge, LA 70803;
Department of Mechanical Engineering,
e-mail: A.Shojaei.Mech.Eng@gmail.com;
A.Shojaei@ucl.ac.uk
Department of Mechanical Engineering,
Louisiana State University,
Baton Rouge, LA 70803;
Department of Mechanical Engineering,
University College London
,Torrington Place, London WC1E 7JE
, UK
e-mail: A.Shojaei.Mech.Eng@gmail.com;
A.Shojaei@ucl.ac.uk
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Guoqiang Li,
Guoqiang Li
1
Professor
Department of Mechanical Engineering,
Louisiana State University,
Department of Mechanical Engineering,
e-mail: GuoLi@me.lsu.edu
Department of Mechanical Engineering,
Louisiana State University,
Baton Rouge, LA 70803
;Department of Mechanical Engineering,
Southern University
,Baton Rouge, LA 70813
e-mail: GuoLi@me.lsu.edu
1Corresponding author.
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George Z. Voyiadjis
George Z. Voyiadjis
Chair
Bingham C. Stewart Distinguished
Professor of Engineering
Department of Civil and Environmental Engineering,
e-mail: Voyiadjis@eng.lsu.edu
Bingham C. Stewart Distinguished
Professor of Engineering
Department of Civil and Environmental Engineering,
Louisiana State University
,Baton Rouge, LA 70803
e-mail: Voyiadjis@eng.lsu.edu
Search for other works by this author on:
Amir Shojaei
Postdoctoral Research Associate
Department of Mechanical Engineering,
Louisiana State University,
Baton Rouge, LA 70803;
Department of Mechanical Engineering,
e-mail: A.Shojaei.Mech.Eng@gmail.com;
A.Shojaei@ucl.ac.uk
Department of Mechanical Engineering,
Louisiana State University,
Baton Rouge, LA 70803;
Department of Mechanical Engineering,
University College London
,Torrington Place, London WC1E 7JE
, UK
e-mail: A.Shojaei.Mech.Eng@gmail.com;
A.Shojaei@ucl.ac.uk
Guoqiang Li
Professor
Department of Mechanical Engineering,
Louisiana State University,
Department of Mechanical Engineering,
e-mail: GuoLi@me.lsu.edu
Department of Mechanical Engineering,
Louisiana State University,
Baton Rouge, LA 70803
;Department of Mechanical Engineering,
Southern University
,Baton Rouge, LA 70813
e-mail: GuoLi@me.lsu.edu
George Z. Voyiadjis
Chair
Bingham C. Stewart Distinguished
Professor of Engineering
Department of Civil and Environmental Engineering,
e-mail: Voyiadjis@eng.lsu.edu
Bingham C. Stewart Distinguished
Professor of Engineering
Department of Civil and Environmental Engineering,
Louisiana State University
,Baton Rouge, LA 70803
e-mail: Voyiadjis@eng.lsu.edu
1Corresponding author.
Manuscript received December 11, 2011; final manuscript received June 13, 2012; accepted manuscript posted July 16, 2012; published online October 29, 2012. Assoc. Editor: Chad Landis.
J. Appl. Mech. Jan 2013, 80(1): 011014 (15 pages)
Published Online: October 29, 2012
Article history
Received:
December 11, 2011
Revision Received:
June 13, 2012
Accepted:
July 16, 2012
Citation
Shojaei, A., Li, G., and Voyiadjis, G. Z. (October 29, 2012). "Cyclic Viscoplastic-Viscodamage Analysis of Shape Memory Polymers Fibers With Application to Self-Healing Smart Materials." ASME. J. Appl. Mech. January 2013; 80(1): 011014. https://doi.org/10.1115/1.4007140
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