Research Highlights: Harshad Paranjape
Harshad Paranjape, Ph.D.
Postdoctoral Scholar, Mechanical Engineering
Ph.D., Materials Science and Engineering
The goal of Harshad’s research is to quantify the influence of constraint on inelastic deformation in materials.
Constraints of various types exist from nano to macro scale due to the microstructural and structural features in materials and components. For example, at the nanometer scale in shape memory alloys (SMAs), compatibility requirements result in local stress concentrations at austenite–martensite interfaces, which are relaxed through slip in austenite. At the grain scale, grain boundaries constrain deformation; thus, deformation heterogeneities develop in SMA polycrystals from the grain interior to the periphery as well as from the sample interior to the surface. At the macro length scale, notches, cavities, and inclusions lead to stress concentrations, which locally alter the phase transformation response in SMAs.
Harshad combines high-energy X-ray diffraction experiments with micromechanical and phenomenological modeling to measure and predict deformation at multiple length scales in the presence of these constraints. The experimental component provides lattice strain and crystal orientation data at the grain and subgrain scales. The modeling component augments these data by providing local stress distributions. This research is key to engineering microstructures that lead to more durable components.
For more information, visit Harshad's personal website.
- P.P. Paul, H.M. Paranjape, B. Amin-Ahmadi, A.P. Stebner, D.C. Dunand, L.C. Brinson, (2017). Effect of Machined Feature Size Relative to the Microstructural Size on the Superelastic Performance in Polycrystalline NiTi Shape Memory Alloys, Materials Science and Engineering: A. https://dx.doi.org/10.1016/j.msea.2017.09.016.
- Paranjape, H. M., Bowers, M. L., Mills, M. J., Anderson, P. M. (2017). Mechanisms for Phase Transformation Induced Slip in Shape Memory Alloy Micro-crystals. Acta Materialia. https://dx.doi.org/10.1016/j.actamat.2017.04.066
- Paranjape, H. M., Paul, P., Sharma, H., Kenesei, P., Park, J.- S., Brinson, L. C., Stebner, A. P. (2017). The Influence of Granular Constraints and Surface Effects on the Mechanical Response of Shape Memory Alloys. Journal of the Mechanics and Physics of Solids. https://dx.doi.org/10.1016/j.jmps.2017.02.007
- Paranjape, H. M., Bucsek, A. N., Kappes, B., Sharma, H., Bernier, J. V., Dale, D., Ko, P., Anderson, P. M., Stebner, A. P. Predictive Characterization of the Inelastic Deformation in NiTi Shape Memory Alloys at the Microstructural Length-scales. ICOMAT 2017, Evanston, IL, July, 9–14, 2017. Invited.
- Paranjape, H. M., Stebner, A. P., Bhattacharya, K. A Robust Macroscopic Finite Element Model Implementation for Coupled Phase Transformation and Plastic Deformation in Shape Memory Alloys. Shape Memory and Superelastic Technology Meeting, San Diego, CA, May 15–19, 2017.
- Paranjape, H. M., Paul, P. P., Sharma, H., Park, J. S., Kenesei, P., Stebner, A. P., Brinson, L. C. Role of Granular Constraint and Surface Effects on the Phase Transformation Mechanics in Shape Memory Alloys. TMS 2017 Annual Meeting, San Diego, CA, February 26–March 2, 2017.