Seminar & Colloquium
[세미나: 9월 9일(월), 오후 2시] Dr. Dilip K. Banerjee, National Institute of Standards and Technology (NIST)
Title
An Overview of the NIST Center for Automotive Lightweighting (NCAL)’s Ongoing Research Efforts in Metal Forming
Speaker
Dr. Dilip K. Banerjee, Mechanical Performance Group, Materials Science and Engineering Division, Material Measurement Laboratory, National Institute of Standards and Technology (NIST)
* EDUCATION
- B.Tech.(Honors) (Metallurgical Engineering), IIT Kharagpur, India
- MS and Ph.D. (Materials Engineering), The University of Alabama, Tuscaloosa, AL, U.S.A.
- MBA (University of Maryland, College Park, Maryland, U.S.A.)
* EXPERIENCE
- Developer, ProCAST Software
- Group leader, General Electric Company, U.S.A.
- Employed at NIST (2002-present)
* Materials Engineer and Program Manager, Advanced Technology Program
* Senior Program Manager, NIST Standards Services Division
* Research Engineer, Building and Fire Research Lab (Member of scientific team, World Trade Center 7 failure investigation)
* Research Scientist, Mechanical Performance Group, Materials Science and Engineering Division, Material Measurement Lab (NIST Center for Automotive Lightweighting)
| Date | Monday, September 9th, 2024
| Time | 14:00 ~
| Venue | 33동 125호(WCU 다목적실)
| Abstract |
This presentation will first highlight few important research projects on metal forming that are currently underway at the NIST Center for Automotive Lightweighting (NCAL). Then the remainder of the presentation will mainly focus on mainly two topics: a) NIST’s efforts in developing biaxial cruciform designs of several important automotive alloys and b) recent work on understanding uncertainties in parameters in hardening laws (e.g., Swift) and how these uncertainties influence the flow stresses and the hole expansion behavior of Dual-Phase (DP600) steel specimens. For the first part of the talk, a methodology will be described for obtaining optimum biaxial cruciform specimen designs by combining equibiaxial tension test data with finite element analysis (FEA) in conjunction with the application of an appropriate optimization strategy. This approach is applied for developing optimum specimen designs for an ASTM A1008 steel, a stainless steel (SS) 316L, and an AA 6xxx-T4 alloy. This methodology requires in sequence the (a) selection of an appropriate initial biaxial specimen design and development of an equivalent, verified FEA model, b) optimization of the verified FEA models, (c) fabrication of cruciform specimens according to the optimized dimensions and testing under appropriate loading conditions, and (d) simulating the validation test with an equivalent FEA model with boundary conditions obtained from the tests. This study shows that such a combined “test-FEA-optimization” approach can be successfully applied to develop optimum cruciform specimen designs for advanced lightweighting materials. For the second part of the presentation, a Monte Carlo-based approach will be discussed that was used to estimate uncertainties in the true stress obtained from the Swift hardening law. Finite element analysis results will be briefly discussed to demonstrate how uncertainties in hardening model parameters influence the deformation behavior in the hole expansion tests of DP 600 steel specimens.
| Host | 한흥남 교수(02-880-9240)