Michael Stender ME Faculty Candidate - Research Seminar
- Thursday, April 6, 2017 at 11:00am
- Roberts Hall - view map
Multiphysics Modeling from Osteoarthritis to Additive Manufacturing
Abstract: Multiphysics simulation techniques wherein coupled physical processes are simulated simultaneously (e.g. thermal-mechanical, solid-fluid, etc.) have enabled previously unforeseen insights into an increasingly wide array of engineering and scientific problems. This presentation will explore two recent applications of multiphysics simulations in biomechanics and additive manufacturing. In biomechanics, I will discuss finite element modeling techniques developed to better understand the initiation and progression of osteoarthritis, a potentially debilitating degradation of the tissues in articulating joints. The first objective of this work is to develop a thermodynamically consistent constitutive damage model for articular cartilage, the tissue lining the contact surfaces of joints. An articular cartilage damage model is developed with a capability to model 3-D fully anisotropic damage including complete tissue failure in uniaxial tension. The second aim of this work is to develop a model of the bone-cartilage unit including the effects of solid-fluid interactions during loading. The second aim demonstrates the differences in solid-fluid behavior between normal and osteoarthritic joints and suggests that alterations in fluid flow patterns as a result of osteoarthritis may lead to increasingly diminished joint health. In additive manufacturing, a recent thermal-mechanical framework for modeling the additive manufacturing of metals during and following the Laser Engineered Net Shaping, or LENS process will be presented. Implications of this additive manufacturing model with regards to residual stress profiles, final part shape, and thermal processing conditions will be discussed. These applications demonstrate the capability of computational modeling to elucidate a wide array of physical processes and mat help to improve treatment strategies for osteoarthritis and to develop additional confidence in the mechanical performance of additively manufactured metal structures.
Bio: Michael Stender received his B.S. and M.S. degrees in Mechanical Engineering from Cal Poly, San Luis Obispo, and a Ph.D. in Mechanical Engineering from the University of Colorado, Boulder. He specializes in computational mechanics and multiphysics modeling. Michael was previously a staff member at Lawrence Livermore National Laboratory and he is currently a Senior Member of the Technical Staff at Sandia National Laboratories.