• Title/Summary/Keyword: 고장력 강판

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Fatigue Life Analysis of Spot Weldment of Cold Rolled and High Strength Steel Using FEM (FEM에 의한 일반냉연강판 및 고장력강판의 점용접 피로수명해석)

  • Yu, Hyo-Sun;Yang, Sung-Mo;Kang, Hee-Yong;Kim, Hong-Gun;Kim, Kyu-Sang
    • Transactions of the Korean Society of Machine Tool Engineers
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    • v.17 no.5
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    • pp.58-63
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    • 2008
  • Cold rolled and high strength steel were used for vehicle bodys to satisfy environmental regulation and improve fuel ratio. This paper presented a method far determining the fatigue life of cold rolled steel sheet EZNCEN and high strength steel sheet HS40R spot weldment used in vehicles. We can estimate the fatigue life of the spot weldments from the MSC/FATIGUE using the finite element method. The maximum load is found in the nugget part of both surfaces. The cold rolled steel and the high strength steel showed the maximum stress 746MPa and 730MPa in the effective nugget part when the weld current was 8KA and 7KA, respectively. Also the some weld current of the cold rolled steel and high strength steel is applied, the fatigue life of high strength steel is obtained about four times longer than the cold rolled steel.

Design of Helical Self-Piercing Rivet for Joining Aluminum Alloy and High-Strength Steel Sheets (알루미늄 합금과 고장력 강판 접합을 위한 헬리컬 SPR의 설계)

  • Kim, W.Y.;Kim, D.B.;Park, J.G.;Kim, D.H.;Kim, K.H.;Lee, I.H.;Cho, H.Y.
    • Transactions of the Korean Society of Mechanical Engineers A
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    • v.38 no.7
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    • pp.735-742
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    • 2014
  • A self-piercing rivet (SPR) is a mechanical component for joining dissimilar material sheets such as those of aluminum alloy and steel. Unlike conventional rivets, the SPR directly pierces sheets without the need for drilling them beforehand. However, the regular SPR can undergo buckling when it pierces a high-strength steel sheet, warranting the design of a helical SPR. In this study, the joining and forging processes using the helical SPR were simulated using the commercial FEM code, DEFORM-3D. High-tensile-strength steel sheets of different strengths were joined with aluminum alloy sheets using the designed helical SPR. The simulation results were found to agree with the experimental results, validating the optimal design of a helical SPR that can pierce high-strength steel sheets.

An Evaluation of the Weldability Characteristics on the 4 Lap Spot Welded Joint of Structural Steel Sheets in Automobile (자동차용 강판의 4겹 다층 점용접물의 용접특성 평가)

  • Kim, Hoi-Hyun;Kim, Seong-Su;Baek, Seung-Se;Kwon, Il-Hyun;Yang, Seong-Mo;Yu, Hyo-Sun
    • Proceedings of the KSME Conference
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    • 2004.11a
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    • pp.314-318
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    • 2004
  • This research is conducted to investigate weldability characteristics with various welding conditions on the 4 lap spot welded joint of structural steel sheets in automobile. The relationship between the tensile-shear strength and the indentation depth has been investigated to evaluate the weldability and the optimum welding conditions. The welding current and the welding time have a greatly affect to the tensile-shear strength compared to the electrode force. It was found that the indentation depth has a relatively close relationship with the expulsion occurrence. The optimum welding conditions were proposed for the 4 lap spot welded joint.

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A Study on the Secondary Buckling of Plate Structure by Arc Length Method (호장증분법에 의한 판구조물의 2차좌굴거동에 관한 연구)

  • 고재용;최익창
    • Computational Structural Engineering
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    • v.11 no.4
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    • pp.209-218
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    • 1998
  • 고장력강이 구조강재로서 널리 사용되고 있다. 구조물의 극심한 하중을 받게되면 최종강도에 도달할 때까지 좌굴을 동반하게 된다. 그러므로, 고장력강판의 좌굴에 대한 정확한 평가가 중요한 설계기준이 되고 있다. 그러나, 고장력강을 효율적으로 사용하기 위해서는 좌굴허용설계를 도입할 수 있도록 판구조물의 판두께가 얇아져야 한다. 따라서, 박판구조물의 합리적인 설계를 하기 위해서는 좌굴후거동해석이 매우 중요하다. 그러므로, 본 논문에서는 호장증분법을 이용하여 압출하중을 받는 박판구조물의 초기좌굴후거동과 2차좌굴강도에 대하여 규명하였다. 특히, 호장증분법을 좌굴정에서의 하중경로를 추정하기 위하여 적용하였다.

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대용량 고속전동기의 제작 <6P-500HP, 2P-4500HP 외>

  • 피재년;홍성일;박태용
    • 전기의세계
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    • v.39 no.9
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    • pp.46-53
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    • 1990
  • 대용량 고속기의 경우는 기계적인 강성, 냉각, 열적해석, BALANCING(진동), 소음, 축의 위험속도 처리등의 이론적 해석과 이것의 응용 및 이론을 근거로한 체계화된 제조기술의 KNOW HOW에 따라 성공여부가 결정된다고 할 수 있겠다. 금번 패사의 대용량 고속기의 제작으로 국내적으로는 지금까지 수입에만 의존해온던 화력, 열병합 발전소, 제철, 제강, 시멘트 등의 대용량 부하가 요구되는 산업장의 대용량 및 고속전동기의 국산화가 가능하게 되었으며 국외적으로는 일본 및 구미지역으로도 수출할 수 있는 길을 열었다고 보아진다. 그러나 국내 각 산업장의 대용량, 고속기의 국산화에 있어서는 사용자의 국산화로의 전향적인 자세와 MAKER의 기술력이 부합될 때에만 가능하다고 할 수 있으며 이것이 향후 국내 중전기 업계의 기술 발전의 향방을 가름한다고 할 수 있겠다. 또 고장력 규소강판, 축재, ENDRING소재, ROTOR BAR, BEARING등 중요자재의 국내 구입시 많은 어려움을 겪었으며 납기, 가격에 관계없이 국내 제작 자체가 불가능한 품목도 있었다. 앞으로 중전기기 업계는 이러한 어려움을 공감하고 소재 및 부품(완제품) MAKER의 공동 개발 및 육성으로 대처해 나가야 할 것이다.

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Structure Analysis on Automotive Seat Recliner Housing with High Tension Steel Plate (고장력 강판으로 된 자동차 시트 리크라이너 하우징에 대한 구조 해석)

  • Cho, Ho-Sun;Kim, Key-Sun;Choi, Doo-Seuk;Kim, Young-Chun;Park, Sang-Heup;Oh, Bum-Suk;Cho, Jae-Ung;Kook, Jeong-Han
    • Journal of the Korea Academia-Industrial cooperation Society
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    • v.14 no.8
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    • pp.3644-3649
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    • 2013
  • Automotive seat recliner has the function to control the angle at the back of chair and has the relation close to the safety of seat. Therefore each of parts constituting the recliner is important and the recliner housing to protect these parts from various dynamic loads is also important. In this study, the recliner housing with t=3mm which is made of high tension steel plate(SPFC 980) is applied to actual automotive seat. The deformation is investigated through the durability tester. Deformation and equivalent stress are also analyzed by simulation analysis under the same condition with experiment. After recliners with thicknesses of 1mm and 2mm are modeled by bases of experimental and analysis values, deformation and equivalent stress are investigated through structural analysis.

Impact Energy Absorbing Capability of Metal/Polymer Hybrid Sheets (금속/폴리머 접합강의 충격 특성에 대한 실험적 연구)

  • Kong, Kyungil;Kwon, O Bum;Park, Hyung Wook
    • Transactions of the Korean Society of Mechanical Engineers A
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    • v.41 no.2
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    • pp.137-142
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    • 2017
  • Recently, the reduction of vehicle weight has been increasingly studied, in order to enhance the fuel efficiency of passenger cars. In particular, the seat frame is being studied actively, owing to considerations of driver safety from external impact damage. Therefore, this study focuses on high strength steel sheet (SPFC980)/polymer heterojunction hybrid materials, and their performance in regards to impact energy absorption. The ratio of impact energy absorption was observed to be relatively higher in the SPFC980/polymer hybrid materials under the impact load. This was found by calculating the equivalent flexural rigidity, which is the bending effect, according to the Castigliano theorem. An efficient wire-web structure was investigated through the simulation of different wire-web designs such as triangular, rectangular, octagonal, and hexagonal structures. The hexagonal wire-web structure was shown to have the least impact damage, according to the simulations. This study can be utilized for seat frame design for passengers' safety, owing to efficient impact absorption.

Welding Properties of 1000MPa Class High Strength Steel Sheets for Car Body Using Disk Laser (자동차용 1000MPa급 고장력 강판의 Disk 레이저용접 특성)

  • Seol, Hyun-Uk;Song, Mun-Jong;Lee, Kyu-Hyun;Lee, Mun-Yong;Kim, Sok-Won
    • Transactions of the Korean Society of Automotive Engineers
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    • v.20 no.5
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    • pp.8-12
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    • 2012
  • Application for laser welding have increased steadily in recent years due to its benefits such as high speed, high productivity and high density energy heat source. In this study, the influence of welding parameters was investigated on penetration characteristics, mechanical properties including formability test in disk laser welded 1000MPa class steels. A shielding gas was used and bead-on-plate test was performed with various welding speeds. The main welding test was performed by butt welding with various welding speeds at 2.5 kW laser power.

Evaluation of Welding Characteristics on 3-lap Spot Joint of Zinc Coned Seel Sheet md High Seength Steel Sheet (아연도금 강판과 고장력 강판 3겹 점용접물의 용접특성 평가)

  • Kwon Il-Hyun;Kim Hoi-Hyun;Baek Seung-Se;Yang Seong-Mo;Yu Hyo-Sun
    • Transactions of the Korean Society of Automotive Engineers
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    • v.13 no.5
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    • pp.42-49
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    • 2005
  • In general, multi-lap spot weld joints are frequently present in automobile. Most research, however, has been focused on the single-lap spot weld joints until now. In this paper, tensile-shear strength tests are performed to examine the weldability of 3-lap spot joint welded by using the high strength steel sheet and the zinc coated steel sheet. The indentation depth and nugget diameter are used to propose the optimum welding conditions. The weldability is affected by the welding current and welding time for 3-lap spot joint. Meanwhile the expulsions is round to decrease with the increase of electrode force. The optimum welding conditions are presented for 3-lap spot joints of high strength steel sheet and zinc coated steel sheet.

Technical Development using High Strength Steel of mP Type on Automobile Parts (TRIP형 고장력강판의 부품적용 기술개발)

  • 류성지;이상제;이규현;이문용
    • Journal of Welding and Joining
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    • v.20 no.3
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    • pp.46-53
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    • 2002
  • The expolitation of substitute material and new manufacturing technology of the automobile body panel for next generation cars have been steadily professed by advanced automobile companies. High strength steel of TRIP (Transformation of Induced Plasticity) type is developed in response to demands about crash safety and high strength of automobile. In this study, basic technologies can fix up problems occurring on the mass production and applied to the other forming methods will be prepared through rasping a property of TRIP material.