Modeling Failure in Ductile Materials
Krishnaswamy Ravi-Chandar, professor, Department of Aerospace Engineering and Engineering Mechanics, University of Texas at Austin
Friday, Feb. 28, 2014
Durham Language and Literature Building (LL) Room 2 [map]
Ductile failure in structural materials has been a problem of longstanding interest, both from the fundamental scientific and applied technological perspectives. Ravi-Chandar 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. The seminar will follow 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.
Krishnaswamy Ravi-Chandar holds the Temple Foundation Professorship in the Department of Aerospace Engineering and Engineering Mechanics at the University of Texas at Austin. Prior to this he was on the faculty at the University of Houston for 17 years. He received his Ph.D. in Aeronautics from the California Institute of Technology in 1982. 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. Read more on the event flier.
This lecture is part of the Mechanical and Aerospace Engineering seminar series.