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강흥식(H.S. Kang),김동성(D.S Kim) 대한기계학회 2004 대한기계학회 춘추학술대회 Vol.2004 No.11
Specifically designed mandrel is needed to expand tube of the heat exchanger with inner grooves. Configuration of the expanded tube depends upon the shape and feeding velocity of the mandrel. 3D simulation software LS-DYNA was used to obtain optimum design conditions of the mandrel. We show how configuration of the expanded tube varies with different design parameters such as the approaching angle, diameter , and the feeding velocity of the mandrel. Material property data for analysis were obtained through experiments with SHPB ( Split Hopkinson Pressure Bars ).