Advances and Challenges in Numerical Modeling of Impact Welding Process
In impact welding, extremely high plastic strain regions develop; traditional FE analysis methods are not able to accurately simulate the process due to excessive element distortion near the contact region. Despite the great successes in developing hybrid and adaptive re-meshing techniques, mesh-based numerical methods suffer from difficulties in some aspects which limit their applications in high-strain-rate problems. Recently, with the exponential growth in computer power, the next generation of computational methods, so called mesh-free methods, have received significant attention, such as smoothed particle hydrodynamics (SPH). In this talk, the results from impact welding simulations between different metals including AM-Steel/AM-Steel, Copper/Copper, and Aluminum/Steel will be presented. Also, the future outlook to investigate the effect(s) of diffused coating on weldability using SPH platform will be discussed.
About the Speaker
Ali Nassiri is a Research Assistant Professor at the Integrated Systems Engineering Department at Ohio State. He received his B.Sc. in Mechanical Engineering and M.Sc. in Aerospace Engineering from Sharif University of Technology, Tehran, Iran. After working in industry for a few years, he began his work at the University of New Hampshire where he received his M.Sc. in Applied Mathematics and Ph.D. in Mechanical Engineering. He continued his career at UNH as a Postdoctoral Research Associate until March 2016. In April 2016, he joined OSU as a Postdoctoral Researcher at CDME with joint appointments in Materials Science and Engineering (MSE). He also served as a Research Scientist at the SIMCenter for more than two years. Ali’s research interests include computational materials joining, non-conventional joining and forming processes, damage and failure analysis, materials characterization, dynamic behavior of materials, and mathematical modeling.