Thermoplastics such as ultrahigh molecular weight polyethylene (UHMWPE) are used for a wide variety of applications, such as bearing material in total replacement of knee and hip components, seals, gears, and unlubricated bearing. Accurate prediction of stresses and deformations of UHMWPE components under service conditions is essential for the design and analysis of these components. This, in turn, requires a cyclic, viscoplastic constitutive model that can simulate cyclic responses of UHMWPE under a wide variety of uniaxial and multiaxial, strain, and stress-controlled cyclic loading. Such a constitutive model validated against a broad set of experimental responses is not available mainly because of the lack of experimental data of UHMWPE. Toward achieving such a model, this study conducted a systematic set of uniaxial experiments on UHMWPE thin-walled, tubular specimens by prescribing strain and stress-controlled cyclic loading. The tubular specimen was designed so that both uniaxial and biaxial experiments can be conducted using one type of specimen. The experimental responses developed are presented for demonstrating the cyclic and ratcheting responses of UHMWPE under uniaxial loading. The responses also are scrutinized for determining the applicability of the thin-walled, tubular specimen in conducting large strain cyclic experiments. A unified state variable theory, the viscoplasticity theory based on overstress for polymers (VBOP) is implemented to simulate the recorded uniaxial responses of UHMWPE. The state of the VBOP model simulation is discussed and model improvements needed are suggested.
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e-mail: thassan@ncsu.edu
e-mail: ozgen@yildiz.edu.tr
e-mail: pmclayton@gmail.com
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April 2011
Research Papers
Uniaxial Strain and Stress-Controlled Cyclic Responses of Ultrahigh Molecular Weight Polyethylene: Experiments and Model Simulations
Tasnim Hassan,
Tasnim Hassan
Department of Civil, Construction and Environmental Engineering,
e-mail: thassan@ncsu.edu
North Carolina State University
, Raleigh, NC 27695
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Ozgen U. Çolak,
Ozgen U. Çolak
Department of Mechanical Engineering,
e-mail: ozgen@yildiz.edu.tr
Yildiz Technical University
, 34349 Yildiz-Istanbul, Turkey
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Patricia M. Clayton
Patricia M. Clayton
Department of Civil, Construction and Environmental Engineering,
e-mail: pmclayton@gmail.com
North Carolina State University
, Raleigh, NC
Search for other works by this author on:
Tasnim Hassan
Department of Civil, Construction and Environmental Engineering,
North Carolina State University
, Raleigh, NC 27695e-mail: thassan@ncsu.edu
Ozgen U. Çolak
Department of Mechanical Engineering,
Yildiz Technical University
, 34349 Yildiz-Istanbul, Turkeye-mail: ozgen@yildiz.edu.tr
Patricia M. Clayton
Department of Civil, Construction and Environmental Engineering,
North Carolina State University
, Raleigh, NCe-mail: pmclayton@gmail.com
J. Eng. Mater. Technol. Apr 2011, 133(2): 021010 (9 pages)
Published Online: March 7, 2011
Article history
Received:
April 15, 2010
Revised:
September 23, 2010
Online:
March 7, 2011
Published:
March 7, 2011
Citation
Hassan, T., Çolak, O. U., and Clayton, P. M. (March 7, 2011). "Uniaxial Strain and Stress-Controlled Cyclic Responses of Ultrahigh Molecular Weight Polyethylene: Experiments and Model Simulations." ASME. J. Eng. Mater. Technol. April 2011; 133(2): 021010. https://doi.org/10.1115/1.4003109
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