275 The Use of Enriched Finite Element Methods to Study the Durability of High Temperature Ceramic Materials in An Oxidizing Environment

Thursday, November 5, 2009: 11:00 AM
Brahma (Camino Real Hotel)
Jack Chessa, Ph.D. , Mechanical Engineering, University of Texas at El Paso, El Paso, TX
In this talk we will present some of the recent work performed in modeling the micro stresses in high temperature ceramic materials, specifically ZrB2 systems in high temeprature oxidizing environments.  The primary failure mechanisms in sush systems are from stresses due to thermal mismatch and oxidataion growth.  Phase change is not considered in this study.  A novel approch to modeling such phenomena is presented.  This approach utilizes enriched finite element methods to model the micro stresses in the microstructure without significant mesh refinement.  The enriched formulation also allows for the simulation of the oxidation effects.   Due to the fact that the micro-stresses can be resolved with miminal mesh refinement, the method lends itself to incorporation into optimization methods. The talk will present a basic overview of the enriched finite element modeling as well as some results including the use of this approach in a response surface (RSM) optimization.