J.N. Reddy
Professor
Member of National Academy of Engineering
Texas A&M University, USA
Biography: J.N. 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 (over 100,000 citations as per Google Scholar), is known for his significant contributions to the field of applied mechanics through the authorship of a large number of textbooks (25) and journal papers (over 900). 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, involving couple stresses, surface stress effects, micropolar cohesive damage, and continuum plasticity of metals.
Dr. Reddy has received numerous honors and awards. Most recent ones include: 2023 Leonaro da Vinci Medal from the European Academy of Sciences, 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 eight national academies, including the 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 Arts.
Invited Lecture: Modeling and analysis of the integrity of architected materials and structures
Abstract: One of the most important things engineers and scientists do is to model physical phenomena. The development of realistic mathematical models of physical phenomena is a part of scientific investigation, which requires the translation of mathematical models into meaningful discrete models that enable us to systematically evaluate various parameters of the mathematical model and hence the physical process. Mathematical model development and numerical simulations help designers, who seek to maximize the reliability of products and minimize the cost of production, distribution, and repairs. Computational methods can be used to investigate the effects of various parameters (e.g., geometry, material parameters, loads, couplings, and so on) of the system on its response to gain a better understanding of the system being analyzed. Architected materials are an emerging class of structures with enhanced mechanical properties to meet desired functionalities. Advanced additive manufacturing and related approaches have made it possible the creation of a wide variety of architected materials with complex geometries. The most common class of architected materials are lattice-based structures, which can be considered as a form of a very dense set of interconnected frame elements. While their superior mechanical properties make them highly desirable in engineering, their intricate microstructure results in complex failure modes and makes it a challenge to predict how they fail. This lecture will discuss (a) nonlocal approaches for modeling architected materials and structures and (b) localized damage evolution in a variety of frame structures. In the first case, the non-local continuum models that account for material and/or structural length scales are discussed to model architected materials and structures (e.g., web-core sandwich panels) using the micropolar elasticity. The model for damage evolution is in accordance with the ideas of continuum damage mechanics, where we model damage to be a continuously varying field that is sufficiently smooth in the closed domain. The usefulness of these approaches will be demonstrated using several nontrivial examples.
