J.N. Reddy

Oscar S. Wyatt Jr. Chair

Regents Professor

Distinguished Professor

J.N. Reddy

Office: MEOB 402
Phone: 979.862.2417
Fax: 979.845.3081
Email: jnreddy@tamu.edu

Research Webpage
Curriculum Vitae
Google Scholar Profile

Research Interests

Dr. Reddy is a Regents Professor, Distinguished Professor, and the inaugural holder of the Oscar S. Wyatt Endowed Chair in Mechanical Engineering at Texas A&M University, College Station, Texas. Dr. Reddy is the author of over 520 journal papers and 19 text books on theoretical formulations and finite-element analysis of problems in solid and structural mechanics (plates and shells), composite materials, computational fluid dynamics, numerical heat transfer, and applied mathematics. His recent books on continuum mechanics are being adopted as text books. Since S.P. Timoshenko, no one has made the same impact in mechanics education as Professor Reddy. In fact, no single person in engineering mechanics since S. P. Timoshenko has written so many well-received textbooks as J.N. Reddy that have lasting impact on the education of three generations of engineers.

 Professor Reddy is also internationally-recognized for his research on mechanics of composite materials and for computational methods. The shear deformation plate and shell theories that he developed bear his name (Reddy third-order shear deformation theory and Reddy layerwise theory) in the literature. The finite element formulations and models he developed have been implemented into commercial software like ABAQUS, NISA, and HyperXtrude.  In recent years, Professor Reddy pioneered (along with Professor K.S. Surana of University of Kansas) practical development of least-squares based finite element models for boundary and initial value problems. The phrase k-version finite element method was introduced first in their writings. The goal of their study was to develop finite element models that yield solutions that are close to the exact solutions to a desired degree.

 The current research of Professor Reddy deals with 7- and 12-parameter shell theories and nonlocal beam and plate theories using the ideas of Eringen, Mindlin, Koiter, and others. He developed (with Dr. Arun Srinivasa) a thermodynamically based strain gradient elasticity theory that contains Mindlin’s model as a special case. He is also working on (internal) polar continuum theories in which varying internal rates of rotations and conjugate moments that exist in all deforming homogeneous and isotropic continua are incorporated in the derivations of the conservation and balance laws. It is shown that this theory leads to a more complete thermodynamic framework as it incorporates additional physics due to varying internal rates of rotation that is neglected in the conventional thermodynamic framework. In addition, Dr. Reddy works on the modelling of biological cells and soft tissues.

Awards & Honors

  • Foreign Fellow, the Indian National Academy of Engineering, September 2015.
  • Member, US National Academy of Engineering (NAE), Washington, DC, 2015.
  • Member, the Academy of Medicine, Engineering & Science of Texas (TAMEST), 2015.
  • The IACM O.C. Zienkiewicz Award from the International Association for Computational Mechanics, 2014.
  • Raymond D. Mindlin Medal from the American Society of Civil Engineers, 2014.
  • Top 100 Scientists, International Biographical Centre, Cambridge, England, October 2012.
  • Satish Dhawan Visiting Professor, Department of Aerospace Engineering, Indian Institute of Science, Bangalore, 2012-2013.

Education

  • Post Doctoral Fellow, Texas Institute for Computational Mechanics, University of Texas at Austin, 1973-1974.
  • Ph.D., Engineering Mechanics (Advisor: Dr. J. T. Oden), University of Alabama in Huntsville, Alabama, 1973.
  • M.S., Mechanical Engineering, Oklahoma State University, Stillwater, Oklahoma, 1970.
  • B.E. (5yr Course), Mechanical Engineering, Osmania University, Hyderabad, Andhra Pradesh, India, 1968.

Selected Publications

Feifei Cheng, Sun-Myung Kim, and J.N. Reddy, “Computational modeling of the plastic-damage behavior of porous MAX phase with aligned ellipsoid-like pores under uniaxial compression,” International Journal of Solids and Structures, Vol. 63, pp. 121-138, 2015.

G. S. Payette and J.N. Reddy, “A seven-parameter spectral/hp finite element formulation for isotropic, laminated composite and functionally graded shell structures,” Computer Methods in Applied Mechanics and Engineering, Vol. 278, pp. 664-704, 2014.

A. Srinivasa and J.N. Reddy, “A model for a constrained, finitely deforming, elastic solid with rotation gradient dependent strain energy, and its specialization to von Karman plates and beams,” Journal of Physics and Mechanics of Solids, Vol. 61, No. 3, pp. 873–885, March 2013.

Cesar Y. Kiyono, Emilio C. N. Silva, and J.N. Reddy, “Design of laminated piezocomposite shell transducers with arbitrary fiber orientation using topology optimization approach,” International Journal for Numerical Methods in Engineering, Vol. 90, No. 12, pp. 1452–1484, 2012.

G. S. Payette and J.N. Reddy, “On the roles of minimization and linearization in least squares finite element models of nonlinear boundary-value problems,” Journal of Computational Physics, Vol. 230, No. 9, pp. 3589-3613, 2011, doi:10.1016/j.jcp.2011.02.002.