Antoinette Maniatty, Ph.D.

Professor, Rensselaer Polytechnic Institute

Modeling the Effect of Microstructure on the Performance of Metal Alloys

Microstructural characteristics of metal alloys, such as grain size, shape and orientation distributions, are strongly related to macroscale performance characteristics, such as anisotropy, strength, formability, and fatigue resistance. Being able to relate the microstructure to the material behavior through computational modeling can allow for more accurate predictive tools for material performance because they are based on the underlying phenomena that govern the material response. Such simulation tools can be used in material and process design as well as probabilistic fatigue life prognosis. This talk will present work that has been in collaboration with Northrop-Grumman Aerospace Systems in Bethpage, NY and General Electric Global Research in Niskayuna, NY, as well as Cornell University.

Work on modeling the effect of microstructure on fatigue life in an aluminum alloy as well as some other efforts on developing grain scale models for predicting macroscale performance of metal alloys will be presented. In high cycle fatigue of metal parts, for most of the part life, the fatigue cracks are microstructurally small, that is of similar size or smaller than the grain size, and thus, are strongly influenced by the local microstructure. Because of this, the fatigue life and its variability depend on microstructural features, such as grain and constituent particle size, which affect the fatigue crack initiation process. In this work, we investigated the effect of microstructure on the early stages of fatigue crack nucleation. We will also present on-going work studying the effect of microstructure representation and issues associated with validation.

Biography

After receiving her B.S. degree in Mechanical Engineering with highest honors from Rensselaer Polytechnic Institute in 1987, Antoinette Maniatty went on to earn an M.S. degrees in Mechanical Engineering from the University of Minnesota in 1988, followed by a Ph.D. from Cornell in 1991. After spending one year as a Visiting Lecturer at the University of Natal in Durban, South Africa, she joined the faculty at Rensselaer in 1992. She was the Clare Boothe Luce Assistant Professor from 1992-1997.

She was one of four women scientists and engineers nationwide to be awarded a Luce fellowship by the Luce Foundation in 1992. In 1993, she received a National Science Foundation Young Investigator Award. She was a member of the Defense Science Study Group in 2000 and 2001. In 2001, she was the first Loewy Visiting Professor in the Materials Science and Engineering Department at Lehigh University. In 2005, she was named a Fellow of the ASME.

Workshop Program
updated: 2011-10-19