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SM 30 C강의 중공 중실축 단면변화가 부식피로강도에 미치는 영향
신규동(Kyou-Dong Shin),장백선(Paik-Sun Chang),김웅집(Woong-Jib Kim) 한국해양공학회 1997 韓國海洋工學會誌 Vol.11 No.2
The corrosion fatigue test was conducted in air to investigate the corrosion fatigue strength of SM 30 C steel by which was corroded in the under sea and the sea surface in the conditions of 3.0% NaCl salt solution. The fatigue tests were carried out on a rotary bending testing machine of cantilever type. The corrosion effect of the sea surface condition was severed more than that of the under sea condition which was due to the periodic contact of air thus accelerated the corrosion. The difference of the fatigue strength between sea surface and under sea conditions decreased with increase of stress level and corroded period. In the case of the solid shaft and thickness 2㎜ of hollow shaft, the difference of corrosion fatigue strength decreased as stress level and corrosion periodic increasing. On the contrary in the case of thickness 1㎜ of hollow shaft, the difference of it increased as stress level, corrosion periodic increasing and also the condition of corrosion changed. The main factors affecting the degradation of fatigue strength due to corrosion were the reduction of sectional area and the increase of surface roughness. The interference phenomenon increased with stress level got higher.
비철금속의 선삭시 윗면 절삭각이 표면 거칠기에 미치는 영향에 관한 연구
전재억,정진서,신규동,구양,하만경 한국공작기계학회 2000 한국공작기계학회 추계학술대회논문집 Vol.2000 No.-
In the present industry, there is not only the cutting of iron metal, but also the cutting of alloy aluminum, brass and plastic to wood(Paulownia). A variety of material is used and these industry is made need of the cutting material but lots of experiments processing is not enough at the moment. At this point, our team processed the basic experiment about influencing of cutting angle of bite concerned to manufacture in the turning of non-iron metal. Generally speaking, we recognized that there was occurrence of increase of rough surface with increasing of cutting angle in the non-iron metal. but in the cutting of wood we knew, there was special change with change of cutting angle.
3% NaCl 수용액중에서 복합조직강의 부식피로 파괴거동에 미치는 주파수변화의 영향
오세욱(S.W. Oh),신규동(K.D. Shin),김웅집(W.J. Kim) 한국해양공학회 1995 韓國海洋工學會誌 Vol.9 No.2
Fatigue tests were carried out by a rotary bending testing machine of cantilever type. M.E.F(ferrite encapsulated islands of martensite) materials were made by a series of heat treatment from a low carbon steel(SM 20 C). The fatigue tests were conducted at stress levels of 302 MPa and 137 MPa with frequencies of 25 ㎐, 2.5 ㎐ and 0.5 ㎐ in 3% NaCl solution.<br/> The fatigue strength increased with frequency got higher. The microcracks and corrosion pits were generated at the boundary between the matrix and the 2nd phase. The cracks generated by the corrosion pits were coalesced with the pits around the notch and became the initial crack. The Ni/Nf ratio increased as the frequency and stress level decreased. The interference phenomenon increased with stress level and frequency gots higher. The crack propagation rate was delayed as the stress level lowers and the frequency gets higher, however, the range of the stress intensity factor depended only on a stress level.
전재억(J. U. Jun),신규동(K. D. Sin),이경국(K. K. Lee),도재윤(J.Y. Do),하만경(M. K. Ha) 한국기계가공학회 2008 한국기계가공학회 춘추계학술대회 논문집 Vol.2008 No.-
The need expands ATV currently to the forestry agriculture fisheries handicappedd person and is becoming. but the development of the industry about this have been processed but are slow. The example to be his representative is the industry about ATV. A gear action of ATV is not currently the action of a differential gear. A gear action revolves the wheel with same power to the rotational requency. We have therefore many when we revolve problem. The power is delivered at this by a chain action. We drew and a plan ATV' LSD which can restrict the transmit of the action ultimately.