Browsing by Subject "induction heating"

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Electromagnetic Field Effect and Analysis of Composite Structure
(2014-07) Hsieh, K-T.; Tzeng, J. T.
The electromagnetic and thermal response of composites subjected to magnetic fields is simulated by solving Maxwell and heat transfer equations simultaneously. The developed analysis accounts for the anisotropic nature of the electrical and thermal properties in three dimensions. A finite element code is developed to predict the response of composite structures subjected to transient magnetic fields. The analysis has been validated against a closed form solution and applied to simulate the induction heating process of composite cylinders. The developed analysis can be applied to the design of modern electrical weapons and used to simulate composite manufacturing processes such as induction cure.
Laser Powder Bed Fusion Fabricated and Characterization of Crack-Free Aluminum Alloy 6061 Using In-Process Powder Bed Induction Heating
(University of Texas at Austin, 2017) Uddin, Syed Zia; Espalin, David; Mireles, Jorge; Morton, Philip; Terrazas, Cesar; Collins, Shane; Murr, Lawrence E.; Wicker, Ryan
A parameter development study for pre-alloyed aluminum alloy 6061 (AA6061) was carried out using an open-architecture powder bed laser melting (LM) technology with capabilities of induction heating for raising the powder bed temperature. Cube specimens (10 mm on each side) were used for parameter development with variation in laser power and scanning speed, whereas layer thickness, hatch spacing and powder bed temperature were empirically determined. While higher relative densities were achieved when using induction heating (as compared to specimens fabricated without induction heating), the key difference in the experiments was the ability to fabricate specimens without cracks when using induction heating. That is, crack-free AA6061 parts were fabricated with the highest relative density measured of 98.7%. Micrographs of specimens fabricated with the induction heating demonstrated the lack of melt pool and melt track features, which are normally only achieved with post-processing heat treatments. This research was important in its approach of using high temperature heating of the powder bed prior to laser scanning to produce crack-free AA6061 parts. Further investigations are ongoing to explore and optimize this fabrication process.
Modeling on the Moving Induction Heating Used in Weld-Based Additive Manufacturing
(University of Texas at Austin, 2014) Bai, X.W.; Zhang, H.O.; Wang, G.I.
This paper numerically investigates the application induction heating in weld-based additive manufacturing to reduce residual stresses. To avoid time-consuming transient electromagnetic calculation, the induction heat is assumed to be constant in the arc coordinate. Thermo-electromagnetic coupling analysis is performed only at a typical time to obtain the representative distribution of induction heat, which is then transferred to the thermal analysis of multilayer deposition as a secondary heat source. Furthermore, the effects of real-time induction preheating and postheating on residual stress state are analyzed in comparative simulations. The results show that both induction preheating and postheating lead to more homogeneous heat input and lower residual stresses compared with the case without induction heating.