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안광현(Kwanghyun Ahn),고윤기(Youn Ki Ko),허훈(Hoon Huh),정현승(Hyun Seung Jung),권태수(Tae Soo Kwon) 한국자동차공학회 2010 한국자동차공학회 학술대회 및 전시회 Vol.2010 No.11
A buffer stop is the device installed at the end of rail lines like railway station to prevent the derailment of a train. When the train cannot stop at the rail end due to some kinds of troubles, this device should absorb the crash energy and stop the train. In Germany, friction type buffer stops are installed at all railway station. Those devices can absorb the crash energy of the train by using the friction between a friction element and the rail when the train crashes into buffer stop. In Korean railway, however, there is no buffer system at the end of rail lines, so passengers and the train can be damaged significantly when the train doesn’t stop at the rail end. In previous study, the buffer stop with new concept, the progressive compression process, was suggested to replace the friction type buffer stop in Germany. A design modification of new concept buffer stop for the application to the real train is conducted in this study. For the real train crash test of new concept buffer stop, a test bench is introduced. By using the results of the real train crash test using test bench, the whole design of buffer stop, the whole frame and the progressive compression elements, will be determined.
안광현(Kwanghyun Ahn),고윤기(Youn Ki Ko),허훈(Hoon Huh),정현승(Hyun Seung Jung),권태수(Tae Soo Kwon) 대한기계학회 2010 대한기계학회 춘추학술대회 Vol.2010 No.5
A buffer stop is the device installed at the end of rail lines like railway station to prevent the derailment of a train. When the train cannot stop at the rail end due to some kind of trouble, this device should absorb the crash energy and stop the train. In Germany, friction type buffer stops are installed at all railway station. Those devices can absorb the crash energy of the train by using the friction between a friction element and the rail when the train crashes into buffer stop. In Korean' railway, however, there is no buffer system at the end of rail lines, so passengers and the train can be damaged significantly when the train doesn't stop at the rail end. In this study, buffer stop with new concept is suggested to replace the friction type buffer stop in Germany. A feasibility of buffer stop using progressive compression process is investigated by using numerical analysis; in addition, the design and concept for new system are suggested by parametric study. Experiment for the verification of feasibility is also carried out based on this study.
안광현(Kwanghyun Ahn),고윤기(Youn Ki Ko),허훈(Hoon Huh),김진성(Jin Sung Kim),정현승(Hyun Seung Jung),권태수(Tae Soo Kwon) 한국자동차공학회 2011 한국자동차공학회 부문종합 학술대회 Vol.2011 No.5
A buffer stop is the device installed at the end of rail lines like railway station to prevent the derailment of a train. When the train cannot stop at the rail end due to some kinds of troubles, this device should absorb the crash energy and stop the train. In Germany, friction type buffer stops are installed at all railway station. Those devices can absorb the crash energy of the train by using the friction between a friction element and the rail when the train crashes into buffer stop. In Korean railway, however, there is no buffer system at the end of rail lines, so passengers and the train can be damaged significantly when the train doesn’t stop at the rail end. In previous study, the buffer stop with new concept, the progressive compression process, was suggested to replace the friction type buffer stop in Germany. A design modification of new concept buffer stop for the application to the real train is conducted in this study. For the real train crash test of new concept buffer stop, a test bench is introduced. By using the results of the real train crash test using test bench, the whole design of buffer stop, the whole frame and the progressive compression elements, will be determined.
안광현(Kwanghyun Ahn),허훈(Hoon Huh),윤종헌(Jonghun Yoon) 한국자동차공학회 2012 한국자동차공학회 부문종합 학술대회 Vol.2012 No.5
This paper is concerned with the effect of deformation twinning on the strain hardening in pure titanium. It is reported that the strain hardening of titanium during compressive deformation shows uncommon behavior. Generally, strain hardening rate of metallic materials is decreasing as strain increases. In accordance with many researches for titanium, however, strain hardening behavior of titanium shows different characteristics from general metallic materials. It is observed that the strain hardening rate of titanium during compression process can be divided into 3 stages. In first stage, strain hardening rate is decreasing as strain increases. Following first stage, strain hardening rate is increasing as strain increases in second stage. After second stage, strain hardening rate is decreasing again as strain increases in third stage. It is well known that the occurrence of the second stage is due to the occurrence of the deformation twinning. In this paper, the occurrence and the growth of the deformation twinning are observed using EBSD. Change of twin volume fraction during compressive deformation of titanium is investigated quantitatively. Strain hardening model which can represent the strain hardening of titanium is also suggested by investigating the effect of deformation twinning on the strain hardening behavior.
안광현(Kwanghyun Ahn),김진성(Jin Sung Kim),허훈(Hoon Huh) 한국자동차공학회 2008 한국자동차공학회 춘 추계 학술대회 논문집 Vol.- No.-
Energy absorption mechanism of the expansion tube is mainly expansion of the tube diameter by pushing a conical punch into the tube while a bottom of the tube is fixed. In order to improve crash energy absorption capacity of expansion tubes. local buckling characteristics of an expansion tube must be considered, since crash energy absorption significantly decreases while buckling occurs. This paper deals with the dynamic local buckling characteristics and crash energy absorption of the expansion tubes during tube expanding process. Static local buckling loads can be predicted by modified Plantema equation. In this study. dynamic term is added to modified Plantema equation for considering strain rate effect of buckling. The tube shape that has maximum crash energy absorption capacity can be obtained by comparing between dynamic modified Plantema equation and numerical analysis of expansion tubes.
안광현(Kwanghyun Ahn),고윤기(Youn Ki Ko),허훈(Hoon Huh),정현승(Hyun Seung Jung),권태수(Tae Soo Kwon) 한국자동차공학회 2009 한국자동차공학회 학술대회 및 전시회 Vol.2009 No.11
A buffer stop is the device installed at the end of rail lines like railway station to prevent the derailment of a train. When the train cannot stop at the rail end due to some kinds of troubles, this device should absorb the crash energy and stop the train. In Germany, friction type buffer stops are installed at all railway station. Those devices can absorb the crash energy of the train by using the friction between a friction element and the rail when the train crashes into buffer stop. In Korean railway, however, there is no buffer system at the end of rail lines, so passengers and the train can be damaged significantly when the train doesn’t stop at the rail end. In this study, buffer stop with new concept is suggested to replace the friction type buffer stop in Germany. A feasibility of buffer stop using progressive compression process is investigated by using numerical analysis; in addition, the design and concept for new system are suggested by parametric study. Experiment for the verification of feasibility is also carried out based on this study.