Faculty Candidate Seminar
Title: |
Finite Deformation of Anisotropic Steel Sheets Undergoing Deformation Induced Austenite-to-Martensite Transformation: Experiments and Modeling |
|
Speaker: |
Dr. Allison Beese |
|
Affiliation: |
Massachusetts Institute of Technology, Cambridge, MA |
|
When: |
Wednesday, February 16, 2011 at 11:00:00 AM |
|
Where: |
MRDC Building, Room 4211 |
|
Host: |
Dr. Rick Neu | |
Abstract Metastable austenitic steels offer a combination of high strength and ductility, which is attributed to their characteristic deformation-induced phase transformation. I will present the development of an anisotropic plasticity model that describes the constitutive behavior of stainless steel 301LN sheets that undergo phase transformation from austenite to martensite. The plasticity model is composed of an anisotropic yield function, an isotropic hardening law, and a nonlinear kinematic hardening law. Additionally, an initial back stress is used to account for the material’s temper-rolling processing history. The microstructural evolution is incorporated into the isotropic hardening law using a stress-state dependent transformation kinetics law that describes the austenite-to-martensite transformation in terms of strain, stress triaxiality, and Lode angle. The plasticity model is calibrated using experimental data, and the subsequent model predictions agree well with the experimental results over a wide range of stress states including uniaxial tension, uniaxial compression, pure shear, transverse plane strain tension and equi-biaxial tension. |
||
Biography Allison Beese received a Bachelor of Science degree in Mechanical Engineering with a minor in Engineering Mechanics from the Pennsylvania State University in 2005. She spent one year working at Knolls Atomic Power Laboratory, a research and development facility whose focus is designing nuclear power for the US Navy’s submarines and air craft carriers. She then joined MIT’s Impact and Crashworthiness Lab, where she combines experimental, analytical, and numerical techniques to perform research on ductile fracture of anisotropic sheet metals. She received her Master of Science degree in Mechanical Engineering from MIT in 2008, and is currently a doctoral candidate with a minor in Biological Engineering/Biomechanics. |
||
Notes |
Meet the speaker |
|