http://chineseinput.net/에서 pinyin(병음)방식으로 중국어를 변환할 수 있습니다.
변환된 중국어를 복사하여 사용하시면 됩니다.
정재강(JaeKang Chung),김재열(JaeYeol Kim),김우진(Woojin Kim) 한국트라이볼로지학회 2006 한국윤활학회지(윤활학회지) Vol.22 No.4
The issue with the drainpipe now a day is that they are laid underground. Causing us to perform additional work to repair, such as digging up the ground and peeling off the insulator that surrounds the pipe. And such series works are difficult that concession appears from government and municipal office. However, if we can save time and money. Performance of piping robot that we are studied in existing session through fixing unit and improvement of cutting bit shorten and wished to heighten work efficiency. And we are trying to develop a unit that can cut up the projecting parts which connects with the interior part of the drainpipes.
차량 밸브용 내열강 STR3과 STR35 이종 마찰용접부의 피로수명 예측에 관한 연구
이동길(Donggil Lee),이상열(Sangryoul Lee),김건호(Gunho Kim),정재강(Jaekang Chung) 한국자동차공학회 2001 한국자동차공학회 지부 학술대회 논문집 Vol.- No.-
The fatigue lifes were investigated and predicted for two kind of heat-resisting steels. STR3 and STR35, to look over the fatigue life of dissimilar friction welding zone by rotary bending fatigue test. A small circular defect were worked at weld interface, 0.5㎜ and 1.0㎜ distance from the interface to look over the fatigue crack propagation behavior according to the notch position.<br/> From the experiment, the fatigue limits of the STR3 and STR35 base metal were 429.0MPa and 409.4MPa respectably. The fatigue life of the STR3 showed about 99% for 1.0㎜ HAZ specimen, about 640% for 0.5㎜ HAZ specimen higher than that of the base metal. And the fatigue life of the STR35 showed about 25% for 1.0㎜ HAZ specimen, about 82% for 0.5㎜ HAZ specimen higher than that of the base metal. But the weld interface specimen was much lower fatigue life than the other specimens because of the weld interface separation.<br/> The fatigue lifes were predicted with an equation of the fatigue crack propagation proposed by Nisitani, d(da/dN) =C(2a)??, the results were found to be within about 5.0% error by comparison with experimented results.<br/> <br/> <br/>