• Journal of the Korean Ceramic Society
• /
• v.31 no.10
• /
• pp.1197-1201
• /
• 1994

The fracture strength and fracture modes were studied in 3Y-TZP/NiNi bonding which change their interfacial structure with bonding condition. Average 4-point bending strength of 200 MPa to 400 MPa were achieved. The formation of Ti-oxide phase at the interface critically influenced the bonding strength and fracture mode. The fracture surface of Ti-oxide free interface contained multiphase in some case including ZrO2. From the result it was confirmed that in order to maximize the bonding strength crack deflection from interface to ceramic was required.

• Journal of Welding and Joining
• /
• v.18 no.4
• /
• pp.87-95
• /
• 2000

Residual stresses and deformations due to welding have effects on the strength of structures. In this paper, the compressive strength of basic welded structures is studied and the effects of the residual stresses and deformations on the compressive strength of beams, plates and shells are investigated,. Theoretical analysis for the basic structures is carried out and simplified methods to calculate the compressive strength are proposed. The proposed methods yield simple formulas to calculate the compressive strength, of which results are much helpful. The accuracy of the proposed method is revealed by comparison with experimental results.

• Journal of Welding and Joining
• /
• v.14 no.3
• /
• pp.93-104
• /
• 1996

This study evaluated relative hot cracking susceptibility of commercial aluminum alloy welds, and then suggested possible mechanisms operated in the weld fusion zone and in the heat affected zone based on the observed cracking morphologies, fractography and microstructural features. The fusion zone solidification cracking was found to be mainly due to a microsegregation of Cu, Si, and Mg in grain boundaries, while liquation cracking in the HAZ was by the incipient melting of the segregated grain boundaries and the consitutional liquation of large aging precipitates and intermetallic compounds in the partially melted zone adjacent to the fusion line which experienced a rapid thermal excursion during welding.

• Transactions of Materials Processing
• /
• v.26 no.4
• /
• pp.246-259
• /
• 2017

• Journal of Welding and Joining
• /
• v.12 no.1
• /
• pp.16-27
• /
• 1994

1970년대 2번에 걸친 석유 파동 이후 재료의 경량화는 자동차, 우주항공분야에서 중요한 문제로 대두되었다. 알루미늄합금은 높은 강도/밀도비, 내식성, 인성 및 저온 특성을 보유하고 있어 일반 가정용품에서 자동차, 우주항공, 선박같은 수송장비까지 여러분야에 사용되고 있으며, 그 사용량과 적용분야는 해가 갈수록 증가하고 있다. 알루미늄합금의 용접특성과 용접 시공기술에 대한 연구결과는 상당히 많이 발표되어 있으나, 실제 현장용접시에는 기공, 불완전 용입 등의 예상치 못한 용접불양이 발생한다. 알루미늄합금의 용접 방법으로는 GTAW, GMAW 등의 보호가스 용접이 주로 사용되고 있다. 본 고에서는 알루미늄합금의 GMAW용접 특성과 용접시 용접 결함에 대하여 간단히 기술하고자 한다.

• Journal of Welding and Joining
• /
• v.12 no.1
• /
• pp.28-37
• /
• 1994

본 소고에서는 Al-Zn-Mg 계통의 고강도 알루미늄합금의 제조과정에서 실시하는 열처리 공정을 통해 얻어지는 시효경화 효과, 합금원소 첨가에 따른 석출물의 생성과 이에 따른 석출경화 효과와 용착금속의 응고균열 발생과의 상호관계를 조사하고 용접열영향부의 용질원자 확산과 입계의 liquid film에 의한 액화(liquation) 균열의 생성을 분석하여 설명하고자 한다.

• Proceedings of the Korea Concrete Institute Conference
• /
• 1992.04a
• /
• pp.59-66
• /
• 1992

The objective of this investigation was to dvaluater the factors influencing the vasic shear strength of Exterior Beam-Column Joint. Reversec cyclic loading were carride out for 10 reinforced concrete Exterior Beam-Column subassemblages. All the specimens finally failed in joint shear.

• Proceedings of the Korea Concrete Institute Conference
• /
• 2004.11a
• /
• pp.389-392
• /
• 2004

An accurate and rational analytical proposal for determining the shear strengths of interior beam-column joints is presented in this paper. The proposed equation is derived using a compatiblity aided truss model theory. The accuracy of the proposed equation was checked by comparing calculated shear strength of joints with experimental results reported papers in literature. The comparison showed that the proposed equation predicted the experimental shear strength of joints with reasonable agreement.

• Journal of the Korean Society of Industry Convergence
• /
• v.9 no.2
• /
• pp.155-160
• /
• 2006

합성상판을 시공하는 경우 교축방향에 분할된 저강판을 접합 일체화해야 한다. 본 논문에서는 강 콘크리트 합성상판을 대상으로 3종류의 배력철근 방향 이음구조를 제안하며, 보 공시체에 의한 정적 정점피로 실험한다. 그 결과 보의 피로실험 결과 저강판 혹은 고력볼트가 피로파단 하였으며, 3차원 FEM해석에 이음부의 휨 강성도 및 피로강도에 대해서 해석적으로 검토된다.

• Journal of Welding and Joining
• /
• v.18 no.1
• /
• pp.77-82
• /
• 2000

The aim of the present study is to investigate the characteristics of ultimate the fatigue strength of hopper knuckles in merchant vessels carrying bulk cargo or LNG/LPG/ The ultimate strength test is undertaken on the hopper knuckle model, subject to end tip load. A series of fatigue tests are carried out on the hopper knuckle models varying the level of the nominal stresses. The elasto-plastic finite element analysis is performed to examine the distribution of hot spot stresses near weld toe and also the progressive collapse behavior of the test model. S-N curves are developed based on the fatigue test results.