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http://dx.doi.org/10.5228/KSTP.2014.23.3.164

Study of Tube Expansion to Produce Hair-Pin Type Heat Exchanger Tubes using the Finite Element Method  

Hong, S. (Global Production Technology Center, Samsung Electronics Co, Ltd.)
Hyun, H. (Global Production Technology Center, Samsung Electronics Co, Ltd.)
Hwang, J. (Global Production Technology Center, Samsung Electronics Co, Ltd.)
Publication Information
Transactions of Materials Processing / v.23, no.3, 2014 , pp. 164-170 More about this Journal
Abstract
To predict the deformation and fracture during tube expansion using the finite element (FE) method, a material model is considered that incorporates the damage evolution due to the deformation. In the current study, a Rice-Tracey model was used as the damage model with inclusion of the hydrostatic stress term. Since OFHC Cu is not significantly affected by strain rate, a Hollomon flow stress model was used. The material parameters in each model were obtained by using an optimization method. The objective function was defined as the difference between the experimental measurements and FE simulation results. The parameters were determined by minimizing the objective function. To verify the validity of the FE modeling, cross-verification was conducted through a tube expansion test. The simulation results show reasonable agreement with the experiments. The design for a minimum diameter of expansion tube using the FE modeling was verified by a simplified tube expansion test and simulation results.
Keywords
Expanded Tube; Ductile Fracture; Damage Model; Rice-Tracey Model;
Citations & Related Records
Times Cited By KSCI : 3  (Citation Analysis)
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