Seminar & Colloquium
[세미나: 9월 2일(월), 오후 1시] Prof. Sushil Mishra, Indian Institute of Technology(IIT) Bombay
Title
Yield locus evolution and forming limit diagram of Aluminum alloys using a novel biaxial cruciform specimen design at different temperatures
Speaker
Prof. Sushil Mishra, Department of Mechanical Engineering, Indian Institute of Technology(IIT) Bombay, India
* Biography
Prof. Sushil Mishra is currently Professor in the Department of Mechanical Engineering, IIT Bombay. Prior
to joining this position, he worked as Senior Manager in Aditya Birla Science and Technology Center,
Mumbai and as senior researcher at General Motors Global R&D, Bangalore. He obtained his
doctorate from IIT Bombay in 2008 and M. Tech. from IIT Madras in 2002. He has more than four
years of post doctorate research experience in corporate R&D. The focus of his research is multiscale
physics based formability studies of metallic alloys. Currently he is heading Microstructural Mechanics
and Micro- Forming lab (MMMF), Advanced Mechanical Testing Facility (AMTF) and Hybrid
Additive Maufacturing Lab (HAM) in IIT Bombay, where more than 20 postgraduate students are
working in the area of Metal forming, Additive manufacturing, microstructure, microtexture and
materials modeling. He has published more than 95 peer reviewed international journal papers and 5
patents. Under his supervision 16 PhD and 20 M Tech students are graduated and currently 15
students are working under him as a postgraduate student at various sponsored project.
| Date | Monday, September 2nd, 2024
| Time | 13:00 ~
| Venue | 33동 222호(동부 세미나실)
[Abstract]
Aluminium alloy is used as a structural material in aerospace and automobile applications where
complex loading conditions are applicable. The material properties under multi-axial loading are
recommended for efficient component design. The mechanical behaviour of aluminium alloys such as
AA 1050, AA 2219, and AA 7475 was investigated through planar biaxial testing using a novel biaxial
cruciform specimen. The yield loci were constructed and compared with existing yield criteria.
Yld2000–2d yield criterion demonstrated accurate predictions with a deviation of approximately 1 %,
highlighting its effectiveness in capturing the yield behaviour. The yield locus evolution and Forming
limit diagram (FLD) were also constructed at different temperatures. Microstructure analysis using
Electron Backscatter Diffraction (EBSD) was conducted to understand the concurrent microstructure
evolution under the multi-axial loading. Bulk-texture analysis was performed using X-ray diffraction
method. An in-situ heating transmission electron microscopy (TEM) experiments were conducted at
the range of temperatures to capture the real-time precipitation and corelate with high temperature
behaviour at different loading condition. Fractography study shows very different fracture surfaces of
biaxial samples compared to uniaxial samples.
| Host | 정인호 교수(02-880-7077)