• Proceedings of the KIEE Conference
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• 2005.07b
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• pp.1023-1025
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• 2005

이방성 전기강판으로 제작되어진 전기기기의 보다 정확한 수치적인 해석을 위해서는 이방성 전기강판의 인가자계방향에 따른 정확한 자계특성 측정이 필요하다. 이 논문에서는 개발되어진 2방향 자계인가 형 싱글시트 테스터를 이용하여 이방성 전기강판의 인가자계방향에 따른 자계특성을 측정하였다. 실험을 통하여 방향성 전기강판의 rolling direction과 transverse direction에 대하여 각각 1.8[T]와 1.3[T]까지 측정할 수 있었다.

• Proceedings of the Korean Environmental Sciences Society Conference
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• 2004.05a
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• pp.399-400
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• 2004

ZrO용액으로 코팅한 시편들의 염수분무시험에 의한 백청과 적청의 초기 발생시간으로 내식성을 평가한 결과를 토대로 정리해 보면 인산염강판에 ZrO를 단독으로 처리하는 경우에는 ZrO피막에서의 균열로 인하여 처리하지 않은 인산염처리 소재강판의 내식성보다 약간 증대하는 경향을 보였고, ZrO/BTSE를 복합 처리한 시편에서는 ZrO의 균열 틈새를 BTSE로 채워짐으로서 내식성이 개선되었으며 수지를 부가적으로 처리함으로 내식성이 월등히 향상되는 것으로 나타났다.

• Journal of Korean Society of Steel Construction
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• v.18 no.4
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• pp.457-468
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• 2006

An experimental study was performed to investigate the maximum energy dissipation and the ductility capacity of shear-dominated steel plate walls with thin web plates. Three specimens of three-story plate walls with thin web plates were tested. The parameters for the test specimens were the aspect ratio of the web plate and the shear strength of the column. A concentrically braced frame and a moment-resisting frme were a also tested for comparison. The steel plate walls exhibited much better ductility and energy dissipation capacity than the concentrically braced frame and the moment-resisting frame. The results showed that unlike other structural systems, the sh as well as strength, and can therefore be used as an effective earthquake-resisting system. A method of predicting the energy dissipation capacity of a steel plate wall was proposed.

• Journal of the Korea Concrete Institute
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• v.22 no.5
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• pp.703-710
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• 2010

Reinforced concrete beams of existing structure often encounter insufficient shear problems for various reasons. Application of steel plates is one of widely used methods for shear strengthening of reinforced concrete beams that are insufficient of shear capacity. This study presents test results on strengthening shear deficient RC beams by external bonding of vertical and diagonal slit type steel plates with anchor bolt. Test parameters are width, interval, angle and length of slits with anchor bolt. The purpose was to evaluate the failure modes and shear capacities for RC beams strengthened by various slit type steel plates with anchor bolt. The results showed that the slit type steel plate specimens strengthened by adhesive bonding and bolting failed in shear fracture modes at maximum load. Flexural crack first occurred on the tension face of beam and then inclined cracks occurred on the shear span. Finally, slit type steel plates strengthened by adhesive bonding and fastening bolts managed to delay abrupt debonding and didn't detach fully from main body of RC beam.

• Journal of the Computational Structural Engineering Institute of Korea
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• v.28 no.3
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• pp.259-266
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• 2015

In this paper, transverse shear spacing and effective depth of wide beams were considered as parameters to evaluate the shear capacity of wide beam according to transverse spacing of steel plates with openings in experimental way. The eight specimens were composed of: five specimens of shear reinforced by steel plates with openings and three non-reinforced specimens. Crack, failure mode, strain and load-displacement curve of specimens were analysed. Shear contribution of shear reinforcement is evaluated and maximum transverse spacing of shear reinforcement was proposed. Shear strength of the specimen that reinforced with three stirrup legs was higher than shear strength of the specimen that reinforced with two stirrup legs. And as the effective depth increased, shear strength was increased.

• Journal of Korean Society of Steel Construction
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• v.16 no.3 s.70
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• pp.365-375
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• 2004

This paper presents the numerical results in strength and stress distribution behavior for the connections of corrugated steel plates (CSP). The results obtained using the finite element method indicate that the CSP with =30mm of longitudinal edge lap, by the current standard specification, has very conservative values. The results also indicate the difference of strength behavior from the bolt arrangement. The strength behavior of standard corrugated type with staggered holes is only affected by circumferential edge lap, but the edge lap and bolthole spacing have an effect on the strength behavior for the deeply corrugated type with parallel holes. Based on these results, this paper examines the current specification of the connections for CSP.

• Journal of the Korean Magnetics Society
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• v.15 no.6
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• pp.320-324
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• 2005

The core loss of $3\%$ SiFe is strongly dependent on silicon content, impurities, permeability, and domain structure of the SiFe. Domain refining has been proved to be very good method for reduction of core loss in high permeability grain oriented SiFe, and laser scribing is well-blown as an effective and industrially important method of domain refinement. In this work, magnetic domain refinement has been carried out by using a pulsed Nd : YAG laser, and the core losses have been measured and analyzed to and optimal parameters of the laser treatment. The laser hem was focused with a spot size of $100{\mu}m$ and pulse energy of 10${\~}$35mJ and the lines were scribed with a period of ${\~}$5mm. The core loss was improved up to $17\%$ with 30 ns-Nd : YAG laser beam in $3\%$ SiFe.

• Proceedings of the Korean Vacuum Society Conference
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• 2013.02a
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• pp.384-384
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• 2013

본 연구에서는 e-beam 증착을 이용하여 Al, Mg 단일 금속으로 다층형 Al-Mg 코팅층을 제조하여 특성 분석 및 내식성을 평가하였다. Al-Mg 코팅층은 99.99%의 Al, 99.9%의 Mg grain을 사용하여 E-Beam 가열을 통해 냉연강판 위에 코팅하였다. 증발물질과 기판과의 거리는 48 cm이며, 기판은 세척을 실시한 후 진공 챔버에 장착하고 ~10-5 Torr 까지 진공배기를 실시하였다. 진공챔버가 기본 압력까지 배기되면 아르곤 가스를 주입하고 기판홀더에 800 V의 직류 전압을 인가하여 약 30분간 글로우 방전 청정을 실시하였다. 기판의 청정이 끝나면 아르곤 가스를 차단하고 코팅층의 구성형태에 따라 Al 또는 Mg을 코팅하였다. 다층형 Al-Mg 코팅층은 2층에서 최대 6층까지 제조하였으며 $3{\mu}m$의 두께를 기준으로 Al과 Mg 코팅층의 두께비가 각각 1:1 과 2:1이 되도록 코팅하였다. 6층 이상에서는 코팅층의 두께 제어가 쉽지 않기 때문에 층수는 6층으로 제한하였다.다층형 Al-Mg 코팅층을 주사전자현미경으로 관찰한 결과, Al-Mg 코팅층간의 계면을 관찰할 수 있었다. 또한 글로우방전분광기로 Al-Mg 코팅층을 관찰한 결과, Al과 Mg 코팅층이 균일한 다층 구조를 형성하고 있는 것을 확인할 수 있었다. 다층의 Al-Mg가 코팅된 강판을 염수분무시험을 통해서 내부식 특성을 확인하였다. Al-Mg 코팅 강판의 염수분무시험 결과, Al-Mg 코팅층의 층수가 증가할 수록 내부식 특성이 향상되는 것을 확인할 수 있었으며, 이러한 현상은 Al-Mg 코팅층이 다층으로 형성되어 있어 부식 생성물을 효과적으로 차단하여 강판의 부식을 방지한 것으로 판단된다.

• Journal of Korean Society of Steel Construction
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• v.28 no.6
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• pp.467-476
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• 2016

For the connections between modular units in modular buildings, the bolted joints with connector plates are used commonly. The strength of structure is determined by the weakest part of structure and the connections may be weaker than the members being joined. Therefore, to check the safety of modular building, the structural performance of connections between modular units as well as that of beam-to-column connections should be evaluated. In this study, the behavior of module to module connection with straight and cross shaped connector plates is investigated by lateral cyclic tests according to KBC2009 0722.2.4 which shall be conducted by controlling the story drift angle in the width and the longitudinal direction respectively. All of test results generally show the stable ductile behavior up to 0.04rad drift levels and the tests in longitudinal direction show a superior energy dissipation per cycle in each of the load steps. However, the straight shaped connector plates have the degradation of stiffness with cyclic loading and the larger drift angle of column than the cross shaped connector plates.

• Proceedings of the Korean Institute of Surface Engineering Conference
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• 2013.05a
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• pp.191-191
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• 2013

최근 차량 경량화와 승객의 안전성을 위하여 고성형/고강도강의 수요가 급격히 증가하고, 이를 위한 강종 개발로 고강도 및 고버링성 소재가 개발되고 있으며, 또한 차량의 자동차의 사용환경이 점차 가혹해지고 장수명화 됨에 따라 자동차 강판에서 방청방식의 중요성이 크게 대두되고 있어, 이를 충족시키기 위한 합금화융융아연도금 열연강판(HGA)의 사용이 증대되고 있다. 따라서 본 연구는 고강도/고버링성의 합금화용융도금열연강판 개발을 목적으로 하였으며, 합금 성분 및 PGL의 열처리 조건에 따른 기계적 물성 을 평가하였으며, SEM,OM등을 통한 미세조직 관찰 및 홀확장성 평가를 실시 하였다.