• 제목/요약/키워드: Y-joints

검색결과 4,634건 처리시간 0.033초

응력확대계수를 이용한 하중 전달형 필릿 용접부의 피로강도 평가에 관한 연구 (A Study on the Fatigue Life Assessment for Load-carrying Fillet Welded Joints using Stress Intensity Factor)

  • 김명현;강성원;김형래
    • Journal of Welding and Joining
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    • 제26권6호
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    • pp.97-102
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    • 2008
  • It is well known that there exist two typical fatigue crack initiation locations in ship structures: one is the weld toe and the other is the weld root where partial penetration weld is performed. In particular, it is important for fillet weldments to avoid weld root cracking in order to prevent catastrophic failure particularly in ship structures. Therefore detail considerations are required for cruciform joints with partial penetration when there is a possibility of weld root crack initiation. For these reasons, fatigue tests on welded joints were performed in this study. Concept of stress intensity factor(SIF) by means of fracture mechanics is applied for predicting fatigue life of fillet welded joints.

Experimental study on the cyclic behaviour of bolted end-plate joints

  • Adany, Sandor;Calado, Luis;Dunai, Laszlo
    • Steel and Composite Structures
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    • 제1권1호
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    • pp.33-50
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    • 2001
  • In this paper an experimental study is performed on end-plate type joints. The test arrangement represents a column-base joint of a steel frame. Altogether six specimens were tested, each of them subjected to cyclic loading. The specimens were carefully designed by performing detailed preliminary calculations so that they would present typical behaviour types of end-plate joints. On the basis of the experimentally established moment-rotation relationship, the cyclic characteristics of each specimen have been calculated and compared to one another. The results are evaluated, qualitative and quantitative conclusions are drawn.

환보강 T형 관이음부의 강도산정식 (Strength Evaluation Formulae for Ring-stiffened Tubular T-joints)

  • 조현만;류연선
    • 한국전산구조공학회:학술대회논문집
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    • 한국전산구조공학회 2002년도 가을 학술발표회 논문집
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    • pp.533-540
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    • 2002
  • Tubular joints having a large diameter are reinforced using internal ring stiffener in order to increase the load carrying capacity. In this study, the static strengths of Internally ring-stiffened tubular T-joints subjected to compressive brace loading are assessed. Nonlinear finite element analyses are used to compute the behavior of unstiffened and ring-stiffened T-joints. From the numerical results, Internal ring stiffener is found to efficient in improving the ultimate capacity, and reinforcement effect are calculated. The influence of geometric parameters for members and ring is evaluated. Based on the FE results, regression analysis is performed considering practical sizes of ring stiffener, finally strength estimation formulae for ring-stiffened T-joints are proposed.

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고리형 내부 보강재를 가진 X형 관이음부의 축방향 강도 평가 (Axial Strength Evaluation for Tubular X-Joints with Internal Ring Stiffener)

  • 조현만;류연선;김정태
    • 한국전산구조공학회:학술대회논문집
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    • 한국전산구조공학회 2001년도 봄 학술발표회 논문집
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    • pp.162-169
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    • 2001
  • Tubular joints are usually reinforced using thicker can section or ring stiffeners to increase the load carrying capacity. In this paper, a numerical study has been performed for evaluation of axial strength for X-joints with internal ring stiffener, The finite element analysis software was used for nonlinear strength analysis. According to variation of ring geometries, the effect of ring stiffener for X-joints are investigated. Internal ring stiffener is found to be efficient improving ultimate strength of tubular joints. Relations of thickness of ring and axial strength are observed considering geometric parameters of ring stiffeners.

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프리캐스트 콘크리트 전단키의 역학적 거동에 관한 실험연구 (An Experimental Study on the Behavior of Precast Concrete Shear Keys)

  • 오병환;이준서;이형준;임동환
    • 한국콘크리트학회:학술대회논문집
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    • 한국콘크리트학회 1992년도 봄 학술발표회 논문집
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    • pp.86-89
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    • 1992
  • In the precast segmental method of construction, segments of a structure are precast, assembled, and tied together by post-tensioning to form the structure. Shear strength and behavior of points in precast concrete structures are important problems in the design of these structures. An experimental program was set up study the shear behavior of precast concrete shear keys. experimental models of keyed joints include a single key, representing one of a series include the shear key shape, d/h ratio(1/4, 1/5, 1/7), and inclined angle (45。 60。 75。). Two different types of joints, i.e., epoxied joint and dry joints were studied. From the present tests, it is found that epoxied joints have higher shear strength than those of dry joints, and that high d/h ratio keys have higher shear strength than those of low d/h ratio keys. The keys with 60。-inclined angle shows the highest shear strength among various angles.

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경비관절에 대한 생역학과 정형물리치료적 고찰 (A Study on Biomechanics and Orthopedic Manual Therapy for Tibiofibular Joints)

  • 김호봉
    • 대한정형도수물리치료학회지
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    • 제9권1호
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    • pp.5-17
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    • 2003
  • 경비관절은 문헌적으로나 임상적으로 소홀히 다루는 관절로써 알려져 왔다. 몇몇 연구자들에 의해 생역학적 원리와 병리학적인 무제가 정립되었고, 평가방법 및 정형도수적 치료방법 등이 개발되어 왔다. 무릎과 족관절부의 병변은 항상 경비관절에 문제를 야기시킬 수 있다는 것을 전제로 평가에서 포함하여 다루어져야 한다. 경비관절에서 유발되는 질환은 대개 정형도수적 치료방법이 매루 효과적으로 적용될 수 있다고 사료된다.

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선 자세에서의 인체 관절의 지각 불편도 측정 (Measurement on Perceived Human Body Joints Discomfort in the Standing Posture)

  • 기도형
    • 산업공학
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    • 제10권3호
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    • pp.197-208
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    • 1997
  • In workplace design, an ergonomic solution should ensure low postural stress in the operator during his/her work. Stress caused by awkward working postures of the trunk, shoulders and legs can result in fatigue, discomfort, musculo-skeletal disorders and nerve entrapment syndromes. Since discomfort and musculo-skeletal disorders are both related to exposure to biomechanical load on the musculo-skeletal system, minimization of discomfort will contribute to reduction of the risk for musculo-skeletal disorders as well. Therefore, in this study, perceived discomfort on the human body joints was measured in the standing postures using the magnitude estimation in order to have a standardized numerical scale for joint discomfort. Nine healthy graduate students participated voluntarily in the laboratory study. The results revealed that perceived discomfort of all the joints increased as the joints deviated from neutral position. Especially, it showed drastic increment on perceived discomfort when deviation from neutral position in each human body joint increased from 75% to 100%. in terms of relative range of motion(R0M). On the basis of these experimental results, a preliminary ranking for assessment of stressfulness of non-neutral postures around the human body joints was suggested.

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온도에 따른 케이블 직선 접속재 모델링 EPOXY/EPDM 계면의 파괴 특성에 관한 연구 (A study on analysis of interfacial breakdown properties with variable temperalure in straight cable Joint modeling EPGXY/EPOM interface)

  • 배덕권;정인재;김상걸;정일형;이준웅
    • 한국전기전자재료학회:학술대회논문집
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    • 한국전기전자재료학회 1999년도 춘계학술대회 논문집
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    • pp.532-535
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    • 1999
  • In power cable joints, the interfaces of two different dielectric materials are inevitable. In addition, the interfacial breakdown between two internal dielectric surfaces represents one of the major causes of failure for power cable joints. We chose epoxy/EPDM interface, one of the interface in cable joints, and investigate dielectric interfacial breakdown phenomenon. First, design specimen with Flux 2D. Second, find interface condition which has high dielectric strength. Third, investigate interfacial breakdown properties with variable temperature.

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돌기형 접합 보강재를 이용한 옥상 노출 복합방수의 조인트 시공방법에 관한 연구 (Sheet Jointing Method of the Roof Exposed Hybrid Waterproofing Using the Bump-type Joint Reinforcement)

  • 김명지;안기원;김동춘;오상근
    • 한국건축시공학회:학술대회논문집
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    • 한국건축시공학회 2018년도 추계 학술논문 발표대회
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    • pp.147-148
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    • 2018
  • Seat waterproofing materials applied to the roof of a building concrete structure inevitably produce joints and are applied with opposite dam joints or overlapping joints depending on the waterproof material applied to the top of the sheet. In this case, the joint performance is determined by the material at the top, rather than by the superimposed joint. In order to solve this problem, various reinforcements have been used to apply to the connecting parts of the opposite dam, but the problem of attachment between different materials or the lack of reinforcement of the joint tape has not been solved. Therefore, for the purpose of securing tensile performance to the joints, this study is used as a reinforcement for the joints of PP materials with high tensile performance and as a reinforcement for nylon materials.

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휠로더의 3 차원 모델링 및 시뮬레이션 (Three Dimensional Modeling and Simulation of a Wheel Loader)

  • 박준용;유완석;김희원;홍제민;고경은
    • 대한기계학회:학술대회논문집
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    • 대한기계학회 2004년도 춘계학술대회
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    • pp.870-874
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    • 2004
  • This paper presents a three dimensional modeling and simulations of operation and running of a wheel loader using the ADAMS program. A wheel loader consists of a bucket, a boom, a crank, a front frame, a rear frame, a bucket cylinder, two boom cylinders, two steering cylinders, nine spherical joints, six universal joints, five translation joints, three inline joints, a revolute and a fixed joint. Judging from the actual degrees of freedom of the wheel loader, proper kinematic joints are selected to exclude redundant constraints in the modeling. Through the running simulation over a bump with the three dimensional modeling, the joint reaction forces are calculated.

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