Visita del Profesor J.N. Reddy

[Pablo A. Kler]

Estimad@s colegas, les hago llegar la invitación que nos acerca Sebastián D ́hers del ITBA

El Profesor J.N. Reddy visitará el ITBA del 23 al 26 de abril próximo. 

El día Jueves 25 a las 16:30hs realizará una presentación sobre: Locking-free shell finite element and nonlocal approaches for architected structures and fracture.

La cita es el la Sede del ITBA de Distrito Financiero, San Martín 202, C1004AAB Cdad. Autónoma de Buenos Aires, en el aula es la 401F, piso 4to. Para participar hay que inscribirse en el siguiente form: https://forms.gle/P8EawxjmxLjgmiY89.

Copio debajo la información de la charla y un breve Bio del Profesor Reddy aunque no necesita presentación.

Le agradecería difunda la invitación a los miembros de la Asociación Argentina de Mecánica Computacional.

Muchas Gracias

Dr. Sebastián D'hers

LOCKING-FREE SHELL FINITE ELEMENT AND NONLOCAL APPROACHES FOR ARCHITECTED STRUCTURES AND FRACTURE

 

J.N. Reddy

Center of Innovation in Mechanics for Design and Manufacturing

Department of Mechanical Engineering, Texas A&M University, Texas 77843-3123 USA

 jnr...@tamu.edu; http://mechanics.tamu.edu

ABSTRACT

The lecture will present the speaker’s recent research in: (1) the development of higher-order, locking-free shell finite elements for large deformation of laminated and functionally graded plate and shell structures [1,2], (2) nonlocal approaches for modeling architected materials and structures [3,4], and a graph-based finite element analysis (GraFEA) of fracture in brittle solids [5-9]. The seven-, eight-, and twelve-parameter shell elements developed are based on modified first-order and third-order thickness stretch kinematics, and they require the use of fully three-dimensional constitutive equations. Through the numerical simulation of carefully chosen benchmark problems, it is shown that the developed shell elements are insensitive to all forms of numerical locking and are the best alternative to 3-D finite elements in saving computational resources while predicting accurate stresses. The graph-based finite element approach with nonlocal criterion (called GraFEA) to study fracture in solids is found to be very robust and accurate in predicting fracture. The approach has the ability to model discrete microcracking with random crack orientations. The computational technique also incorporates a probabilistic approach to damage growth by using a measure of “microcrack survival probability” and its evolution. The approach will be demonstrated using several examples.

References

1. G.S. Payette and J.N. Reddy, Computer Methods in Applied Mechanics and Engineering, 278, 664-704, Aug 2014.
2. Miguel Gutierrez Rivera, J.N. Reddy, and Marco Amabili, Mechanics of Advanced Materials and Structures, 27(7), 551-560, 2020.
3. Anssi Karttunen, J.N. Reddy, and Jani Romanoff, International Journal of Solids and Structures, 170, 82-94, 2019.
4. Jani Romanoff, Jasmin Jelovica, J.N. Reddy, and Heikki Remes, Meccanica, appeared online, June 2020.
5. Parisa Khodabakhshi, J.N. Reddy, and A.R. Srinivasa, Acta Mechanica, 230, 3593-3612, 2019.
6. Prakash Thamburaja, K. Sarah, A.R. Srinivasa, and J.N. Reddy, Computer Methods in Applied Mechanics and Engineering, 354, 871-903, 2019.
7. K. Sarah, P. Thamburaja, A. Srinivasa, and J. N. Reddy, Mechanics of Advanced Materials and Structures, 27(13), 1085-1097, 2020.
8. P. Thamburaja, K. Sarah, A. Srinivasa, and J. N. Reddy, Proceedings of the Royal Society A, 477 (2252), 2021.
9. H. Y. Shin, P. Thamburaja, A. Srinivasa, and J.N. Reddy, Extreme Mechanics Letters, 52, article 101618, 2022.

Brief Vitae of J.N. Reddy

http://mechanics.tamu.edu/

 

Dr. Reddy is a Distinguished Professor, Regents’ Professor, and the holder of the O’Donnell Foundation Chair IV in Mechanical Engineering at Texas A&M University, College Station, Texas. Dr. Reddy, an ISI highly-cited researcher, is known for his significant contributions to the field of applied and computational mechanics through the authorship of 24 textbooks and nearly 800 journal papers. His pioneering works on the development of shear deformation theories (that bear his name in the literature as the Reddy third-order plate theory and the Reddy layerwise theory) have had a major impact and have led to new research developments and applications. Some of the ideas on shear deformation theories and penalty finite element models of fluid flows have been implemented into commercial finite element computer programs like ABAQUS, NISA, and HyperXtrude. In recent years, Reddy's research has focused on the development of locking-free shell finite elements and nonlocal and non-classical continuum mechanics problems.

Dr. Reddy has received numerous honors and awards. Most recent ones include: 2022 IACM Congress (Gauss-Newton) Medal from the International Association of Computational Mechanics, the 2019 SP Timoshenko Medal from American Society of Mechanical Engineers, the 2018 Theodore von Karman Medal from the American Society of Civil Engineers, the 2017 John von Neumann Medal from the U.S. Association of Computational Mechanics, the 2016 Prager Medal from the Society of Engineering Science, and 2016 ASME Medal from American Society of Mechanical Engineers.  He is a member US National Academy of Engineering and foreign fellow of Indian National Academy of Engineering, the Canadian Academy of Engineering, the Brazilian National Academy of Engineering, the Chinese Academy of Engineering, the Royal Engineering Academy of Spain, the European Academy of Sciences, and the European Academy of Sciences and Engineering.