Krishnaswamy Ravi-Chandar
Temple Foundation Professor
University of Texas at Austin
Friday, October 10, 2014, 11am
801 22nd Street NW, Phillips Hall 736
Washington, DC 20052
Hosted by: Dr. James Lee ([email protected])
Abstract: Ductile failure in structural materials has been a problem of longstanding interest, both from the fundamental scientific and applied technological perspectives. In this presentation, I will describe the results of a multiscale experimental investigation which reveals that very large deformations occur under different stress states without measureable damage in the material at scales that are above grain size; this brings about the need for proper calibration of the underlying plasticity models for strain levels that are much greater than accessible in standard test procedures. The experiments are also used to provide a robust lower bound estimate for the onset of fracture. I will follow this with a description of a hybrid experimental-computational procedure for material modeling. The efficacy of the resulting constitutive and failure models will be demonstrated through two example problems that include nucleation and growth of cracks in complex structural configurations.
Biographical Sketch: Krishnaswamy Ravi-Chandar holds the Temple Foundation Professorship in the Department of Aerospace Engineering and Engineering Mechanics at the University of Texas at Austin. His research is focused in the identification of constitutive and failure behavior of materials including fracture, fragmentation, strain localization and dynamic stability, ductile failure, nonlinear waves, multiscale experimental mechanics, mechanics of polymers. He is the Editor-in-Chief of the International of Fracture. He served as President of the International Congress on Fracture (2005-2009), Member of the Executive Committee of the Applied Mechanics Division of the ASME (2003-2008), and President of the American Academy of Mechanics (2011-2012).