• 한국재난정보학회 논문집
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• 제12권1호
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• pp.40-46
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• 2016

Nowdays, adjacent loading bringing enormous harm to the existing bridge in engineering construction. In this paper, the influencing mechanism of adjacent loading to pier and Law of displacement of pier is researched through living examples, and the safe influence area has been defined. Research shows that: the main damages to piers is caused by the side loading; lateral displacement index of pier top surface is more conservative than the pier additional stress index; it is secure when the distance of adjacent load is 0.5 times of the height of accumulation or 6m, otherwise it would be very scary, and the monitoring measure is necessary.

• 한국소음진동공학회:학술대회논문집
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• 한국소음진동공학회 1996년도 춘계학술대회논문집; 부산수산대학교, 10 May 1996
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• pp.355-360
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• 1996

When the operational strains of a structure can not be directly measured in order to predict the life of the structure due to the problem of the attachment, those must be obtained indirectly. Since the displacement and the strain are interrelated, the strain can be predicted from the measured displacement and displacement-strain transformation matrix. The transformation matrix is dependent on the boundary condition, unfortunately, and it is also difficult to know exactly that of the operational system. In this study, for the structure with arbitrary boundary condition under the operation, the approximate method is proposed in order to predict the operational strains using the transformation matrix obtained by using free boundary conditions. And the method is applied to predict the strains of leads of surface mount component under the vibration of the printed circuit board.

• 한국지반공학회:학술대회논문집
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• 한국지반공학회 2007년 가을학술발표회
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• pp.127-137
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• 2007

Faults are fractures along which there is visible offset by shear displacement parallel to the fracture surface. Faults can occur as single discrete breaks, but where the rock has been repeatedly faulted, or where the rock is especially weak, no discrete break may be evident. What forms instead is a fault zone composed of countless subparallel and interconnecting closely spaced fault surfaces. Faulting is fundamentally a brittle mechanism for achieving shear displacement. At deep crustal levels where rocks tend to deform plastically under conditions of elevated temperature and confining pressure, shear displacement is achieved by and development of shear zones. In this paper authors propose the fault grade in Korea.

• 한국정밀공학회:학술대회논문집
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• 한국정밀공학회 2003년도 춘계학술대회 논문집
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• pp.363-366
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• 2003

The hard turning is a turning operation performed in high strength alloy steels (HRC>30) in order to reach surface roughness close to those obtained in grinding. This is possible because of availability of improved tool materials (polycrystalline cubic boron nitride. PCBN), ad more rigid machine tools. According to many previous work of hard turning mechanism, the maximum temperature of cutting can be raised up to 100$0^{\circ}C$. As the heat generation rate is very high, the thermal displacement of tool holder cannot be negligible. Therefore, the aim of this paper is to analyze effects of high heat generation at CBN tool tip to the thermal displacement of a tool holder in hard turning and finally geometric accuracy. The thermal behavior of a CBN tool holder is investigated by numerical simulation and experiment, and the result shows thermal elongation of microns order is possible during hard turning process.

• 대한기계학회논문집A
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• 제29권11호
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• pp.1542-1550
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• 2005

This paper presents the numerical procedure for calculating non-uniform residual stresses based on relieved displacements obtained from incremental hole drilling. The relationship between the in-plane displacement produced by introducing a blind hole and the corresponding residual stress is established. Finite element calculations are described to evaluate the relieved coefficients required for the determination of non-uniform residual stresses. Validity of the proposed method has been tested through three axisymmetric test examples and two three-dimensional examples. As a result of . simulation on the test examples, it is found that this numerical procedure is well adopted to measuring non-uniform residual stress in the full hole depth range of the hole diameter from the surface. The accuracy of the hole drilling method with displacement measurement is discussed, comparing tile method with strain measurement

• 한국철도학회논문집
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• 제7권3호
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• pp.186-192
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• 2004

Using the finite element method, rail-wheel contact model has been analyzed for mechanical loads due to passengers and payload of the train. This paper presents an investigation on how tapered wheel and inclined rail surfaces affect the contact stress and displacement of rail-wheel contacting surface under mechanical loads. For a numerical analysis, the tapered faces of the wheel are considered as 2.5% and 5.5%. And two models of the tilted rail are also considered as 40：1 and 20：1 at the bottom of the rail. The computed results based on the contact stress and displacement FE analysis indicate that the tilting ratio of the rail, 20：1 with a tapered face of the wheel, 2.5% may be more stable compared to that of 40：1 tilting model and 5.5% tapered wheel face.

• 한국전기전자재료학회:학술대회논문집
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• 한국전기전자재료학회 1997년도 추계학술대회 논문집
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• pp.385-388
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• 1997

We hate examined the electrical properties of L-${\alpha}$-DLPC Langmuir(L) films by using a displacement current measuring technique with pressure stimulation. Displacement current was generated when the sample spread volume was about 280${\mu}\ell$, 360${\mu}\ell$ and compression velocity was about 30, 40, 50mm/min. Displacement current was generated in the range of gas state, gas/fluid state and fluid state in the course of monolayer compression. From the result, it is known that displacement current is generated in the range of high surface pressures as compression velocity become faster.

• 한국정밀공학회지
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• 제11권1호
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• pp.114-122
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• 1994

ESPE(Electonic-Speckle-Pattern-Interferometry) is very useful method for measuring In-plane displacement. Using the CW-Laser and Image processing system, it is possible to measure displacement and strain. Unlike traditional straingauge or moire' method, ESPI method requires no special surface preparation or attachments and can be measured In-plane displacement with no contact and real time. In this experimental specimen was loaded in paralled with loadcell, which provided loading step. The specimen was sheet plate, which was attached straingauge in x-y direction. In this study provides an example of how ESPI has been used to measure two dimensional displacement and strain distribution in this specimen. The results measured by ESPI compare with the data which was measured straingauge method in tensile testing at 1 ton range.

• 한국건축시공학회:학술대회논문집
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• 한국건축시공학회 2021년도 봄 학술논문 발표대회
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• pp.59-60
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• 2021

To measure the effect of the stress-strain dispersion across the installed waterproofing layer on the concrete surface, a strain gauge was attached to the gap between the waterproofing layer and the concrete structure at specified points of upper, center and bottom of the load-displacement simulation specimen, and the peak stress-strain at the displacement interface were measured and compared with stress-strain at other areas to analyze each material types' stress-strain dispersion ratio properties. Based on the results of the testing, it was shown that materials with high load-displacement resistance performance accordingly had high stress-strain dispersion ratio results, and the materials from highest performance to lowest performance were; CAS, SAS, PUC and CSC.

• 한국지구과학회지
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• 제34권6호
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• pp.470-478
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• 2013

백두산에서는 2002년부터 화산성 지진활동의 증가, 정밀 수준측량 관측을 통한 지표면 팽창, 특정 화산가스 방출량의 증가, 온천수의 온도 증가 등 화산 전조활동이 활발해짐으로써 나타나는 전조현상들이 관측되었다. 이러한 관측결과 중 정밀 수준측량 데이터를 활용한 백두산 천지 칼데라 주변의 수직, 수평 지표변위 경향 분석을 통해 2002년 이후 2009년까지 지표가 팽창하는 경향을 나타냄으로써 백두산 지하 마그마 챔버의 부피가 증가하였음을 확인할 수 있었다. 이후 2010년을 기점으로 지표가 수축하는 경향을 나타내기도 하였으나 이후 다시 팽창하는 경향을 나타냄을 확인할 수 있었다. 북측 사면에서 2002년부터 2003년까지 칼데라 외륜산 일대의 지표면이 46.33 mm 융기 팽창한 것을 바탕으로 지하 마그마 챔버의 부피 변화량을 계산해 보면, 약 0.008 $km^3$ ($7.7-8.0{\times}10^6m^3$)의 부피가 증가한 것으로 계산되었다. 이는 백두산 산정부로부터 지하 약 5 km 지점에 천처 마그마 챔버가 형성되고 0.008 $km^3$의 마그마가 주입된 것으로 해석된다.