SUBJECT: Ph.D. Proposal Presentation
   
BY: Seyed Ali Tabei
   
TIME: Wednesday, July 9, 2014, 1:00 p.m.
   
PLACE: MARC Building, 431
   
TITLE: Modeling of Microstructural Evolutions in Machining of Dual Phase Alloys
   
COMMITTEE: Dr. Steven Y. Liang, Co-Chair (ME)
Dr. Hamid Garmestani, Co-Chair (MSE)
Dr. Antonia Antoniou (ME)
Dr.Karl I. Jacob (ME)
Dr. Guillermo Goldsztein (MATH)
Dr. Sad Ahzi (MSE)
 

SUMMARY

Machining induces remarkable localized changes in the microstructure of the material being processed. These changes (or evolutions) subsequently result in modifications in the properties of the material. For the case of multiphase materials, these microstructural evolutions are multiplied because of the presence different phases with different characteristics. These microstructural evolutions include texture evolutions in the phases undergoing plastic deformation, refinement and redistribution of brittle phases, modifications in grain size and size distribution, microstructural defects evolution and so forth. The extent of such evolutions depends on machining parameters namely tool speed, feed rate, tool angle and etc. On the other hand, the properties of the material being machined are considered as essential factors in determining the process mechanics (necessary force or energy of machining and so on). Since the microstructural evolutions occur and affect the process mechanics dynamically as the process continues, an iterative comprehensive model is required to dynamically simulate the microstructural evolutions, homogenize the evolved microstructure to obtain the new properties and input the properties into machining models to determine the process mechanics. Since such a comprehensive and iterative model and some of its components are not available in the literature, new modeling frameworks have to be first developed and then verified either experimentally or by well-known numerical techniques such as finite element method. The objective of this work is to provide and validate such a modeling toolset; which yields the dynamic microstructural evolutions and properties of a dual phase alloy being machined by means of iterative integration with the process mechanics.