• Title/Summary/Keyword: 2024 알루미늄

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Evaluation of Corrosion Resistance according to Surface treatment of Installed Ammunition Case(ALDC12) (설치형 탄약 케이스의(ALDC12) 표면처리에 따른 부식 영향성 평가)

  • Jonghyeon Lee;Jonghyeon Lee;Sangbong Lee;Hyemin Park;Namyoung Yu
    • Journal of the Korea Institute of Military Science and Technology
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    • v.27 no.4
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    • pp.457-465
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    • 2024
  • The Remote Control Munition System is a anti-personnel munitions system to replace land mines that are hard to retrieve and can inflict damage on friendly forces and civilians. As operating environments and methods change, quality improvement is necessary to ensure appropriate durability. Therefore, corrosion resistance evaluation was performed according to the surface treatment of ALDC12, the main assembly material. We conduct the potentiodynamic polarization, cyclic corrosion test to perform analysis on corrosion behavior. Additionally, we try to observe the pitting on the surface through SEM analysis. In conclusion, among the three surface treatments, Anodizing surface treatment is judged to be the most suitable for corrosion durability in a field environment.

Study on the properties of aluminum nitride sintered using an induction furnace without sintering additives (소결조제 없이 유도가열로를 이용해 소결된 질화알루미늄의 특성 연구)

  • Hyo Min Choi;Kyung-Pil Yin;Jong-Won Yoon
    • Journal of the Korean Crystal Growth and Crystal Technology
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    • v.34 no.3
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    • pp.98-102
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    • 2024
  • In this study, the crystal characteristics of commercial AlN powders with sizes of "㎛" and "nm" were selected through XRD analysis and then sintered at different temperatures through an induction heating furnace to investigate the optimized sintering temperature and physical properties. The sintering temperature was 1,500, 1,700, and 1,900℃ in the N2 atmosphere, and the optimized sintering temperature conditions were established for the sintered AlN pellets using SEM, XRD, and Raman analysis. Additionally, impedance analysis was performed to confirm the electrical properties of the optimized AlN pellet without sintering additives.

A Linear Programming-Based Algorithm for Raw Recycled Material Mixtures in the Aluminum Alloy Fabrication Process (알루미늄 합금 제조공정에서의 선형계획모델 기반 재활용 원재료 혼합 비율 결정 알고리즘)

  • Min-Ju Kang;Ji-Hoon Kim;Kyeong-Jin Song;Yu-Jin Byun;Jae-Gon Kim
    • Journal of Korean Society of Industrial and Systems Engineering
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    • v.47 no.2
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    • pp.40-47
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    • 2024
  • As environmental concerns escalate, the increase in recycling of aluminum scrap is notable within the aluminum alloy production sector. Precise control of essential components such as Al, Cu, and Si is crucial in aluminum alloy production. However, recycled metal products comprise various metal components, leading to inherent uncertainty in component concentrations. Thus, meticulous determination of input quantities of recycled metal products is necessary to adjust the composition ratio of components. This study proposes a stable input determination heuristic algorithm considering the uncertainty arising from utilizing recycled metal products. The objective is to minimize total costs while satisfying the desired component ratio in aluminum manufacturing processes. The proposed algorithm is designed to handle increased complexity due to introduced uncertainty. Validation of the proposed heuristic algorithm's effectiveness is conducted by comparing its performance with an algorithm mimicking the input determination method used in the field. The proposed heuristic algorithm demonstrates superior results compared to the field-mimicking algorithm and is anticipated to serve as a useful tool for decision-making in realistic scenarios.

Influences of Process Conditions on the Surface Expansion and Contact Pressure in Backward Can Extrusion of Al Alloys (알루미늄 합금을 이용한 후방압출에 의한 캔 성형시 성형 조건이 표면확장과 접촉 압력에 미치는 영향)

  • Min, K.H.;Seo, J.M.;Koo, H.S.;Vishara, R.J.;Tak, S.H.;Lee, I.C.;Hwang, B.B.
    • Transactions of Materials Processing
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    • v.16 no.7
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    • pp.521-529
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    • 2007
  • This paper is concerned with the analysis on the surface expansion of AA 2024 and AA 1100 aluminum alloys in backward extrusion process. Due to heavy surface expansion appeared usually in the backward can extrusion process, the tribological conditions along the interface between the material and the punch land are very severe. In the present study, the surface expansion is analyzed especially under various process conditions. The main goal of this study is to investigate the influence of degree of reduction in height, geometries of punch nose, friction and hardening characteristics of different aluminum alloys on the material flow and thus on the surface expansion on the working material. Two different materials are selected for investigation as model materials and they are AA 2024 and AA 1100 aluminum alloys. The geometrical parameters employed in analysis include punch corner radius and punch nose angle. The geometry of punch follows basically the recommendation of ICFG and some variations of punch geometry are adopted to obtain quantitative information on the effect of geometrical parameters on material flow. Extensive simulation has been conducted by applying the rigid-plastic finite element method to the backward can extrusion process under different geometrical, material, and interface conditions. The simulation results are summarized in terms of surface expansion at different reduction in height, deformation patterns including pressure distributions along the interface between workpiece and punch, comparison of surface expansion between two model materials, geometrical and interfacial parametric effects on surface expansion, and load-stroke relationships.

Numerical Simulation of Failure Mechanism of PELE Perforating Thin Target Plates (얇은 표적체판에 천공하는 PELE 의 파괴 메커니즘 수치시뮬레이션)

  • Jo, Jong Hyun;Lee, Young Shin
    • Transactions of the Korean Society of Mechanical Engineers A
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    • v.36 no.12
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    • pp.1577-1583
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    • 2012
  • Penetrator with enhanced lateral effect (PELE) is a novel projectile that does not require dynamite and a fuse. It comprises a high-density jacket that is closed at its rear end and filled with a low-density filling material. To study the explosion characteristics of PELE using AUTODYN-3D code, the calculation models of the projectile body and the bullet target were developed and the process of penetrating an aluminum-2024 alloy target using PELE was simulated. The scattering characteristics after PELE penetrated the aluminum-2024 alloy target were studied for different filling materials. The explicit finite element analysis of PELE fragmentation was implemented with the stochastic failure criterion in AUTODYN-3D code. As the filling expanded, the fragments gained velocity and dispersed laterally, increasing the damage area considerably. The number and shape of PELE fragments differed depending on the impact pressure of the filling that fragmented during the penetration and lateral dispersion processes.

Comparative Test of the End Fitting Materials of Polymer Insulators (폴리머 애자의 금구재질에 따른 비교 시험)

  • Hwang, K.;Park, Y.C.;Lee, S.K.;Oh, Y.W.;Jung, S.Y.;Kim, B.K.
    • Proceedings of the KIEE Conference
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    • 2001.11a
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    • pp.93-95
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    • 2001
  • 현재 폴리머 애자의 금구 재질로 사용되고 있는 구상 흑연 주철품(FCD450). 기계 구조용 탄소강(SM20C) 및 알루미늄 합금(A2024)의 압착에 따른 인장파괴하중의 값과 재질고유의 인장시험 등을 통하여 가장 우수한 특성을 보이는 재질을 선정하고자 하였다. 본 실험 결과 기계구조용 탄소강(SM20C)이 압착조건에서는 기계적 특성에서 우수한 재질로 판정이 되었으며, Qs(품질관리지수)를 계산한 결과도 만족한 값을 보였다. 향후 전철용 고분자 장간애자에서는 구상 흑연 주철품(FCD450)으로만 규정되어 있는 금구 재질을 동등 이상의 재질로 규정하는 것이 특성향상에 바람직할 것으로 보여진다.

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The Behavior of Crack Growth Rate for APAL and CPAL Patched with FRP Laminate in Aluminum Alloy Plate (알루미늄 합금판재에 FRP 라미네이터를 보강한 APAL 및 CPAL 재의 균열전파속도 거동)

  • 윤한기;정해용;허정원
    • Transactions of the Korean Society of Mechanical Engineers
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    • v.19 no.4
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    • pp.1013-1022
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    • 1995
  • A hybrid composite (APAL;Aramid Patched ALuminum alloy, CPAL;Carbon Patched ALluminum alloy), consisting of a Al 2024-T3 aluminum alloy plate sandwiched between two aramid/epoxy and carbon/epoxy laminate, was developed. Fatigue crack growth behavior was examined at stress ratios of R=0.2, 0.5. The APAL and CPAL showed superior fatigue crack growth resistance, which may be attributed to the crack bridging effect imposed by the intact fibers in the crack wake.

The Influence of the Small Circular Hole Defect on the Fatigue Crack Propagation Behavior in Aluminum Alloys (알루미늄 합금재의 피로크랙 전파거동에 미치는 미소원공결함)

  • Kim, G.H.;Lee, H.Y.
    • Journal of Advanced Marine Engineering and Technology
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    • v.32 no.6
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    • pp.834-840
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    • 2008
  • We carried out fatigue testing with materials of aluminum alloyC7075-T6, 2024-T4) by rotary bending fatigue tester. We investigated fatigue limit, fatigue crack initiation, fatigue crack propagation behavior and possibility of fatigue life prediction to the different small circular hole defect. The summarized result are as follows; Fatigue limit of the smooth specimens were related tensile strength and yield strength. In case of more large applied stress and small circular hole crack defect, the fatigue crack was grown rapidly. The fatigue crack propagation behavior proceed at according to inclusion. Fatigue crack propagation ratio appeared instability and retardation phenomenon in the first half of fatigue life but appeared stability and replied in the latter half. On other hand, this experimental data of the materials are appeared fatigue life predictability.

Dynamic deformation behavior of aluminum alloys under high strain rate compressive/tensile loading (상용 알루미늄 합금의 고속 인장/압축 변형거동 규명)

  • Lee, O.S.;Kim, G.H.;Kim, M.S.;Hwang, S.W.
    • Proceedings of the KSME Conference
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    • 2000.11a
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    • pp.268-273
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    • 2000
  • Mechanical properties of the materials used for transportations and industrial machinery under high strain rate loading conditions are required to provide appropriate safety assessment to these mechanical structures. The Split Hopkinson Pressure Bar(SHPB) technique, a special experimental apparatus, can be used to obtain the material behavior under high strain rate loading condition. In this paper, dynamic deformation behaviors of the aluminum alloys, Al2024-T4, Al6061-T6 and Al7075-T6, under high strain rate compressive and tensile loading are determined using SHPB technique.

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A study on the weld nugget formation in resistance spot welding of aluminum alloy (알루미늄 합금의 저항 점 용접시 용접너깃의 형성에 대한 연구)

  • 나석주;오세진
    • Transactions of the Korean Society of Mechanical Engineers
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    • v.10 no.5
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    • pp.661-669
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    • 1986
  • In this study, the resistance spot welding process of an aluminum alloy was analyzed through the numerical simulation including the electric contact resistance and the heat generation in the electrode. The finite element model was used to solve the electro-thermal responses in weld cycles. The resistance of the contact area was represented as the contact element modeling, but the thermal resistance between the contact surfaces was neglected. Welding tests of Alclad 2024-T3 aluminum alloy were made not only to get the input data for the numerical simulation, but also to compare the numerical results. The contact resistance was determined initially by the contact resistance tests and assumed to decay exponentially up to the solidus temperature. The temperature distributions and dynamic resistance obtained numerically were in good agreement with the experimental results. Numerical results revealed that nugget growth depends mainly on the heat generated in the workpiece and its contact area. The heat generated in the electrode has, however, only a little effect on the nugget growth, and the heat generation in the electrode-workpiece interface is initially high but decrease repidly.