Faculty - Negahban

Dr. Mehrdad NegahbanNCMN Homepage Link
Dr. Mehrdad Negaban, Professor

Associate Chair for Graduate Studies and Research
Mechanical and Materials Engineering

University of Nebraska - Lincoln
W311 Nebraska Hall
Lincoln, Nebraska 68588-0526
office: (402) 472-2397
email: mnegahban1@unl.edu
Negahban's web page

Current Research

   Dr. Negahban’s research areas include:

  • Theoretical, computational, and experimental studies to characterize large deformation thermo-mechanical response of materials, in particular polymers.
  • Simulation of the effects of crystallization on the mechanical behavior of polymers under large deformations.
  • The study of the effects of crystallization on failure and the redistribution of stress in polymer matrix composites. Simulation of the manufacturing of thin film extruded polymers.
  • Experimental investigation and theoretical modeling of large plastic forming and shape recovery in amorphous polymers.

Nonlinear Mechanics of Materials and Material Simulation: General interest in theoretical and computational analysis and simulations, and in the experimental characterization of the thermodynamics of solids, with speci c interests in constitutive modeling, nonlinear and time dependent character-
istics, nite deformations, phase transformations, and in development of object oriented nite element methods. Most of this work is focused on modeling and characterization of the response of glassy and semi-crystalline polymers, with a developing interest in modeling and characterization of failure and
fracture with aging, and with developing work on biological materials.

Current Publications

PUBLICATIONS IN PREPARATION (\*" = Student)

1. J. Vogeler*, R. Feng, A. Goel*, M. Negahban, \Using a torsional Kolsky bar to characterizing the normal stress induced by rapid shear in glassy Polycarbonate," (in preparation).

2. A. Goel*, M. Negahban,\Modeling of the anisotropic nonlinear thermoelastic response of Polycarbonate resulting from plastic ow," (in preparation).

35. A. Goel*, M. Negahban, L. Zhang*, \Modeling nonlinear thermo-elastic response for glassy polycar-bonate using ultrasonic results under compression in a con ned cell," Mechanics of Materials, vol. 43, 2011, pages 119-126.

36. A. Goel*, Y. Wen*, J. Hein*, M. Negahban, J. A. Turner, \Measuring the inuence of temperature on the development of the elastic anisotropy with compressive plastic ow for glassy polycarbonate," Journal of Engineering Materials and Technology, vol. 133, 2011, pages 030902-1 to 7.

37. A. Goel*, A. Sherafati*, M. Negahban, A. Azizinamini, Y. Wang*, \A nite deformation nonlinear thermo-elastic model that mimics plasticity during monotonic loading," International Journal of Solids and Structures, vol. 48, 2011, pages 2977-2986.

38. L. Zhang*, M. Negahban, \Propagation of in nitesimal thermo-mechanical waves during the nite-deformation loading of a viscoelastic material: General theory," Zeitschrift fur angewandte Mathematik und Physik (ZAMP), 2012 (DOI:10.1007/s00033-012-0200-5).

39. G. Gao*, Z. Li , M. Negahban, \Dynamic fracture analysis of aged glassy polycarbonate by the method of caustics," Acta Mechanica Solida Sinica, 2012 (accepted).

40. J.F. Cepeda, C.L. Weller, H. Thippareddi, M. Negahban, J. Subbia, \Modeling Cooling of Ready-to-Eat Meats by 3D Finite Element Analysis: Validation in Meat Processing Facilities,"Journal of Food Engineering, 2012 (DOI: http://dx.doi.org/10.1016/j.jfoodeng.2012.11.024).

66. M. Negahban, S. Meagher*, K. Strabala*, L. Delbreilh, J.-M. Saiter, C. Landais*, Z. Li, "The role of evolving anisotropy and physical aging in deformation and fracture of glassy polycarbonate," PolyChar 19, Kathmandu, Nepal, March 20-25, 2011.

67. M. Negahban, A. Goel*, S. Meagher*, L. Delbreilh, J.-M. Saiter, Z. Li, "E_ects of Plastic Flow and Thermal Aging on the Developing Anisotropic Elastic and Toughening Response of Glassy Polycarbonate," US National Congress on Computational Mechanics, Minneapolis, Minnesota, July 25-29, 2011.

68. J. F Cepeda, C. L. Weller, M. Negahban, H. Thippareddi, J. Subbiah, \Modeling Heat Transfer during Cooling of Cooked Ready-to-Eat Meats using Three-Dimensional Finite Element Analysis, " American Society of Agricultural and Biological Engineering Annual International Meeting, Louisville, Kentucky, August 7-10, 2011.

69. L. Zhang*, M. Negahban, \Characterization of nonlinear viscoelastic materials by wave propagation properties," 48th Annual Technical Meeting of Society of Engineering Science, Northwestern University, Evanston, Illinois, October 12-14, 2011.

BOOKS
1. M. Negahban, \The Mechanical and Thermodynamical Theory of Plasticity," CRC Press, Taylor & Francis, Boca Raton, 2012.

Recent Graduates

  • Pierre Delabarre (with Jean-Marc Saiter), Master M2, Materials Engineering (CEMPI), “The  
        Characterization of polycarbonate by DMA and other mechanical testing,” University of Rouen, Rouen,
        France, September, 2004.
  • Kyle Wayne Strabala, “The Effects of Combined Compression and Aging on the Properties of Glassy
       Polycarbonate,” MS, Engineering Mechanics, University of Nebraska-Lincoln, August, 2009.
  • Kyle Wayne Strabala, “The Effects of Combined Compression and Aging on the Properties of Glassy
       Polycarbonate,” MS, Materials Engineering, University of Rouen, Rouen, France, August, 2009.
  • Cline Hayot, “Viscoelastic properties of the cell walls of Arabidopsis thaliana using nanoindentation,”
       MS, Engineering Mechanics, University of Nebraska-Lincoln, August, 2009.
  • Cline Hayot, “Viscoelastic properties of the cell walls of Arabidopsis thaliana using nanoindentation,”
        MS, Materials Engineering, University of Rouen, Rouen, France, August, 2009.
  • Ruojuan Ma, Ph.D., now with Visteon. Thesis: “A study of the influence of uniform crystallization on the mechanical response of polymers and polymer-matrix composites”
  • Juliet Dauphin, “Crystallization studies in PET”-University of Rouen, France.
  • Philippe Dos Santos Claro, “Crystallization in PET during ransient thermal loading” - University of Rouen, France.