Mehrdad Negahban

Associate Professor of Engineering Mechanics

W311 Nebraska Hall University of Nebraska-Lincoln Lincoln, NE 68588-0526

Phone: (402) 472-2397

Fax: (402) 472-8292

e-mail: mnegahban@unl.edu

Crystallization in solid polymers:

I have a general interest in the study of crystallization in solid polymers and its effect on the mechanical and thermodynamic behavior of the polymer. Of particular interest to me is the development of constitutive equations that can capture the thermomechanical changes which the polymer undergoes during crystallization, when the polymer is simultaneously subjected to large time varying deformations. Application of these models to capture the development of residual stresses and other effects of crystallization is also of interest to me.

Publications in this area:

  • M. Negahban, A.S. Wineman, ``Following the Mechanical Response in Phase Transitions: Elastic Solid to Elastic Solid Transitions,'' Proceedings of the Twelfth Canadian Congress of Applied Mechanics, Ottawa, Ontario, 1989, pages 840-841.
  • M. Negahban, A. S. Wineman ``Modeling the Mechanical Response of a Material Undergoing Continuous Isothermal Crystallization,'' International Journal of Engineering Science, vol. 30, no. 7, 1992, pages 953-962.
  • M. Negahban, A. S. Wineman, R. J. Ma, ``Simulation of Mechanical Response in Polymer Crystallization,'' International Journal of Engineering Science, vol. 31, no. 1, 1993, pages 93-113.
  • M. Negahban, ``Simulation of Mechanical Response in Crystallizing Polymers: Crystallization Under Constant Shearing Deformations,'' Mechanics of Materials, vol. 16, 1993, pages 379-399.
  • M. Negahban, ``Theoretical Simulation of an Anomalous Response in a Torsional Oscillator,'' Journal of Applied Mechanics, vol. 61, 1994, pages 124-130.
  • R. Ma, M. Negahban, ``Simulation of Mechanical Response in Crystallizing Polymers: Crystallization under a Constant Shear Force,'' Acta Mechanica, vol. 112, 1995, pages 59-76.
  • R. Ma, M. Negahban, ``Simulation of Mechanical Response During Polymer Crystallization Around Rigid Inclusions and Voids: Homogeneous Crystallization,'' Mechanics of Materials, vol. 21, 1995, pages 25-50.
  • R. Ma and M. Negahban, ``A preliminary study of the mechanical effects of polymer crystallization around a rigid cylindrical inclusion: homogeneous crystallization under plane strain,'' AMD-Vol. 203: Current Research in the Thermo-Mechanics of Polymers in the Rubbery-Glassy Range, ASME-1995, pages 61-75.
  • M. Negahban, ``A thermodynamic theory for characterizing thermo-mechanical response of polymers during crystallization,'' AMD-Vol. 203: Current Research in the Thermo-Mechanics of Polymers in the Rubbery-Glassy Range, ASME-1995, pages 45-60.
  • M. Negahban, ``Thermodynamic Modeling of the Thermomechanical Effects of Polymer Crystallization: A General Theoretical Structure,'' International Journal of Engineering Science, vol. 35, 1997, pages 277-298.
  • M. Negahban, "Thermomechanical Effects Associated with Crystallization of Rubber Under Stretch and During Slow Extension," Journal of Engineering Materials and Technology, vol. 119, 1997, pages 298-304.
  • M. Negahban, "Modeling the thermomechanical effects of crystallization in natural rubber: I. The theoretical structure," International Journal of Solids and Structures, vol. 37, 2000, pages 2777-2789.
  • M. Negahban, "Modeling the thermomechanical effects of crystallization in natural rubber: II. Elementary thermodynamic properties," International Journal of Solids and Structures, vol. 37, 2000, pages 2791-2809.
  • M. Negahban, "Modeling the thermomechanical effects of crystallization in natural rubber: III. Mechanical properties," International Journal of Solids and Structures, vol. 37, 2000, pages 2811-2824.