• 대한기계학회:학술대회논문집
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• 대한기계학회 2003년도 추계학술대회
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• pp.1121-1126
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• 2003

Strength evaluation was carried out for the fillet and oil hole of crankshaft of medium speed diesel HiMSEN engine to verify initial concept design. Alternating torque obtained from torsional vibration analysis and radial force due to firing pressure were applied. It was assumed that the maximum alternating torque and radial force occur simultaneously. Weak points in view of fatigue are proceeding fillet and crank pin fillet area and the minimum normalized fatigue safety factor is 1.17 at crank pin fillet. The fatigue strength of the oil hole was evaluated to verify the effect of the surface roughness of the oil hole. As results, the specific level of the inner surface roughness and the polishing depth of the oil hole for sufficient fatigue strength was suggested. The maximum stress value and stress distribution at the inner surface of the oil hole can be easily estimated at initial design stage by the newly developed method.

• 대한기계학회논문집B
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• 제35권11호
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• pp.1139-1145
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• 2011

기존 봉합사를 이용한 미세혈관수술의 단점을 개선한 기계식 미세혈관 문합시스템은 크게 문합링-핀 시스템 및 디바이스로 구분된다. 유한요소해석을 이용한 본 연구에서 문합링파트는 생체적합성과 사출성형 가공성이 우수한 High Density Polyethylene(HDPE)가 적용되었고, 마이크로핀은 SUS316, Ti-6Al-4Nb, Ti-6Al-4V, unalloyed titanium 이상 4가지 재료가 적용되었다. 미세혈관 문합링 마이크로핀의 fillet radius, neck length가 von Mises stress 변화에 미치는 영향을 평가하기 위해 Short Neck(SN)과 Long Neck(LN)으로 구분하고, 필렛이 존재하지 않는 경우(SN-1, LN-1)와 존재하는 경우(SN-2, SN-3, LN-2, LN-3)로 구분하였다. 필렛 유무와 형상에 대한 von Mises stress의 변화비인 Fillet Radius Rate(FRR)와 동일 필렛형상 내에서 neck 길이변화에 따른 von Mises stress의 변화비인 Neck Length Rate(NLR)의 결과를 종합해본 결과 SN-3의 마이크로핀 neck 형상이 가장 안전한 설계 형상임을 파악할 수 있었다.

• 한국산학기술학회논문지
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• 제21권1호
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• pp.373-379
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• 2020

본 연구는 빌트인 양문형 냉장고의 도어를 최대개방각도로 열었을 때 발생하는 댐핑힌지의 응력해석과 피로수명 해석을 다룬다. 댐핑힌지의 초기설계안에 대하여 유한요소해석을 수행한 결과, 브래킷핀에서 상부원판과 원통이 직각을 이루는 기하학적 불연속 부위에서 국부적 응력집중이 발생하였고, 최대 von Mises 등가응력이 재료의 항복강도를 초과하였다. 이 최대응력 발생 위치는 시작품을 제작하여 수행한 도어개폐 내구시험 시에 파손된 브래킷핀의 부위와 일치하였으며, 응력해석 결과로부터 계산된 피로수명도 내구시험 결과와 정합성이 있는 것으로 나타났다. 브래킷핀의 초기설계 안에서 나타난 응력집중을 완화하기 위하여 브래킷핀의 형상을 변경하는 3가지 설계개선안을 도출하고 해석을 수행하여 안전성을 평가하였다. 설계개선안의 해석결과, 브래킷핀의 원판과 원통 사이에 필렛을 삽입하면 응력집중을 저감시키고 피로수명은 증가하는 것으로 나타났다. 또한 브래킷핀의 원판을 2단으로 변경하면 응력집중을 저감시키고 피로수명은 증가하는 것으로 나타났다. 결론적으로 가장 우수한 설계개선안은 브래킷핀의 원판을 2단으로 변경하고 반경이 큰 필렛을 삽입한 경우로서, 응력집중이 가장 작고 피로수명이 무한대인 것으로 판단된다.

• 대한조선학회 특별논문집
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• 대한조선학회 2011년도 특별논문집
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• pp.51-54
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• 2011

This paper presents methods for design and strength analysis of lifting lugs utilized in assembling, erection, and turning over of ship structures. Lifting lugs are designed in accordance with ASME BTH-1-2008; Design of Below-the-Hook Lifting Devices. Experimental tests for fillet welded joints were conducted to design weld size of lifting lugs and under-structures. The nonlinear finite element method, using MSC.Marc software, is employed for limit state assessment of lifting lugs in static loading conditions. The analysis considers nonlinearities in material properties and contact between lifting lug and pin.

• 한국정밀공학회지
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• 제14권6호
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• pp.22-27
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• 1997

In general, the load which acts on the structure is almost independent of time in many locations. In this case. It is difficult to estimate the life with the service load history, because the structure is on the multi- axial and multi-point loading states. In this study, the service load of the excavator which is widely used in industry field was calculated using measured cylinder pressures and displacements. The fatigue life was estimated using the multi-axial and multi-point load counting method. Service load history of 4 pin joint which act independently each other is yielded by mult-axial and multi-point load counting method. The stress spectrum is yielded by superposition of the results of FEM stress analysis applied unit load. Palm- gren-Miner's cumulative Damage is 0.000804 for Von Mises equivalent stress sequence by one side fillet weld S-N curve. This result agress with Bench test results. As a result of this study, the fatigue life esti- mation using the multi-axial and multi-axial and multi-point load counting method is useful.

• 한국공작기계학회논문집
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• 제16권5호
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• pp.151-156
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• 2007

In this paper, the creep characteristics of lead and lead-free solder joint were investigated using the QFP(Quad Flat Package) creep test. Two kind of solder pastes(Sn-3Ag-0.5Cu, Sn-0.2Sb-0.4Ag-37.4Pb) were applied to the QFP solder joints and each specimen was checked the external and internal failures(i.e., wetting failure, void, pin hole, poor-heel fillet) by digital microscope and X-ray inspection. The creep test was conducted at the temperatures of $100^{\circ}C$ and $130^{\circ}C$ under the load of 15$\sim$20% of average pull strength in solder joints. The creep characteristics of each solder joints were compared using the creep strain-time curve and creep strain rate-stress curves. Through the comparison, the Sn-3Ag-0.5Cu solder joints have higher creep resistance than that of Sn-0.3Sb-0.4Ag-37.4Pb. Also, the grain boundary sliding in the fracture surface and the necking of solder joint were observed by FE-SEM.