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한정우(J. W. Han),김흥섭(H. S. Kim),김재동(J. D. Kim),송시엽(S. Y. Song),최정용(J. Y. Choi) 대한기계학회 2012 대한기계학회 춘추학술대회 Vol.2012 No.11
This study evaluated fatigue strength for bogie frame of an urban maglev train including performing fatigue analysis, cumulative damage and fatigue test based on a developed fatigue load. The results of FEM analysis adopting load combinations showed that all data was under a fatigue limit of the butt welded joint made of A6005 in Goodman diagram. The cumulative fatigue damage was calculated at the highest level from a bolt connecting area of electromagnetic pole in casting block but the total sum was evaluated as D=0.808 based on 1×10?cycles, which indicates it did not exceed the failure criteria. In addition, as the results of fatigue test, there was no crack on the any position of the bogie frame with the results that correspond to the results of fatigue analyses.
무가압함침법으로 제조한 SiCp/AC8A 복합재료의 기계적 성질
김재동(J. D. Kim),고성위(S. W. Koh),김형진(H. J. Kim) 한국복합재료학회 2002 Composites research Vol.15 No.3
무가압함침법에 의해 제조된 SiCp/AC8A 복합재료에 대하여 SiC 입자 크기와 부가적인 Mg의 첨가가 복합재료의 기계적 성질과 마모특성에 미치는 영향을 조사하였다. SiCp/AC8A복합재료의 경도와 굽힘강도는 입자의 크기가 작아짐에 따라 증가하였다. Mg 첨가량이 증가함에 따라 SiCp/AC8A복합재료의 경도는 경질의 반응생성물에 의해 상승하였으나 굽힘강도는 석출물의 조대화와 기공율의 증대에 의해 저하하였다. SiCp/AC8A복합재료는 AC8A 기지재에 비하여 고속의 마찰속도에서 6배의 내마모성을 나타냈으며 강화입자의 크기가 작아짐에 따라 내마모성은 향상되는 것으로 나타났다. 마모기구에 있어서 SiCp/AC8A복합재료는 마찰속도에 관계없이 연삭마모를 나타냈으나 AC8A기지재는 마찰속도가 고속화됨에 따라 응착 및 용융마모의 마모면을 나타냈다. The effect of size of SiC particles and additive Mg content on the mechanical properties and wear characteristics were investigated for the SiCp/AC8A composites fabricated by pressureless infiltration process. Results showed that the hardness and the bending strength increased with decreasing the size of SiC particle. By increasing the Mg content the hardness of SiCp/AC8A composites increased due to the hard reaction products, however the bending strength decreased by formation of coarse precipitates and high porosity level. The SiCp/ac8a composites exhibited about 6 times higher wear resistance compared with AC8A alloy at high sliding velocity and as increasing the particle size, wear resistance was improved. The major wear mechanism of SiCp/AC8A composites exhibited the abrasive wear at low to high sliding velocity whereas AC8A alloy showed adhesive and melt wear at high sliding velocity.