• Title/Summary/Keyword: T형 이음

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Strength Evaluation of Adhesive Bonded Joint for Light Weight Structure by T-Peel Joint Test (T형 이음 접합에 의한 경량구조물용 접착이음강도의 평가)

  • 이강용;공병석;우형표
    • Transactions of the Korean Society of Automotive Engineers
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    • v.6 no.4
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    • pp.56-65
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    • 1998
  • The bonding strength evaluation of the light weight materials for an electrical vehicle has been performed through the T-peel joint test in which the design paramete- rs such as joint style, adherend type, adherend thickness, adhesive thickness, and adhesive type are considered. It is experimentally observed that the peel strength of joint increases with the increase of the adherend thickness. With the increase of the adhesive thickness, however, the peel strength of joint increases a little. Aluminum-FRP adherend combination shows such higher peel strength than that of Aluminum-Aluminum adherend combination. For the adhesive bonded joint, the results of FEM analysis agree with those of experiment. The adhesive bonded joint reinfored with a rivet gives higher peel strength than that of the joint without rivet.

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A Study on Stree Analysis and Bending Fatigue Strength of One Side Fillet Welded T-joint (T형 평면용접이음재의 응력해석과 굽힘피로강도에 관한 연구)

  • Gang, Seong-Won;Lee, Tae-Hun;Jeon, Jae-Mok;Kim, Chung-Hui
    • Journal of Ocean Engineering and Technology
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    • v.13 no.2 s.32
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    • pp.51-57
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    • 1999
  • In this study, one side fillet welded T-joint, used in box type girder and other welding structure, was investigated by stress analysis and bending fatigue test without edge preparation, with variation of joint shape. The purpose of this study is to give the welding condiltion and design standard on manufacturing one side fillet welded T-joint. As a result, the following conclusions were obtained. 1) In one side fillet welded T-joint, the larger the leg length and the penetration depth, the greater the bending fatigue strength because reduction of stress and strain on toe and root. The increase of the longitudinal leg length rather than vertical leg length contributed to the increase in bending fatigue strength. 2) In one side fillet welded T-joint without edge preparation, both general manual welding and general automatic welding were carried out with same condition. In this case, automatic welding showed deeper penetration and more increased longitudinal leg length than manual welding, so that automatic welding offers greater bending fatigue strength. 3) For one side fillet welded T-joint without edge preparation with automatic welding, the ratio(h/t) of the leg length(h) and the main plate thickness(t) in which toe crake can occur was 1.0 over.

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Design of Welded Joints Using Stress Intensity Factors (응력확대계수를 이용한 용접이음부 설계 연구)

  • Park, Ji-Woo;Gu, Man-Hoi;Choi, Chang;Sung, Wan
    • Proceedings of the Korean Society of Precision Engineering Conference
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    • 1996.11a
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    • pp.1058-1062
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    • 1996
  • The assessments of weld defects by fracture mechanics are performed for design of welded Joints. In general, butt, T-type, and L-type welded joint are useful for welding structure. When linear weld defects are in welded joint, stress intensity factors for each joints are calculated by finite element method. Analysis results are shown for the fracture modes and characteristics of joint types. And they are founded for the weaken order of welded joints being T-type, butt, L-type.

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Fatigue Strength Evaluation of T-Peel Adhesive Joing for Light Weight Material (경량 재료의 T형 접합이음의 피로강도 평가)

  • Lee, K.Y.;Kong, B.S.;Choi, H.S.
    • Transactions of the Korean Society of Automotive Engineers
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    • v.6 no.6
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    • pp.166-173
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    • 1998
  • The evaluation of joint fatigue strength of light weight materials for an electrical vehicle body has been performed through T-peel joint tests with the design parameters such as joint style, adherend type, adherend thickness, adhesive thickness, and various adhesives. Fatigue strength was evaluated through 5-Hz, tension-tension, load controlled test with the zero stress ratio. It was observed that the fatigue strength of the joint increases with the increase of the adherend thickness. With the increase of the adhesive thickness, however, the fatigue strength of the joint increases insignificantly. An aluminum-FRP adherend combination shows much higher fatigue strength than an aluminum-aluminum adherend combination. The results of fatigue tests were found to be consistent with those of static tests.

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A study on welding connection's fatigue analysis through numerical and experimental approaches (용접이음부의 피로강도 해석을 위한 수치해석과 실험과의 비교연구)

  • 조규남;하우일
    • Computational Structural Engineering
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    • v.6 no.3
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    • pp.113-123
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    • 1993
  • Most of the ship structures and offshore structures are constructed through the welding and they are always subjected to variable loads. In this study, fatigue and stress concentration of the various types of welding connections due to the variable loads are investigated by using numerical approach, and comparisons between numerical analysis and experiments are performed. Fillet weld, full penetration weld and partial penetration weld characteristics are studied by using parameters such as penetration length, welding leg length, size and penetration angle. Based on this study, it is suggested that the fillet welding can be replaced with the penetration welding in some cases. The results of this study can be used as guidelines for actual welding problems in the shipyards.

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A Study on Bending Fatigue Strength of One Side Fillet Welded T-Joint by SM 490A steel (Sm 490A강으로 제작된 T형 편면용접이음재의 굽힘피로강동에 관한 연구)

  • 엄동석;강성원;이태훈;이해우;조수형
    • Journal of Welding and Joining
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    • v.16 no.5
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    • pp.134-141
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    • 1998
  • In this study, a fillet size for bending fatigue strength of one side fillet welded T-joint, used in box type girder and other welding structure, was investigated by bending fatigue test with or without edge preparation and burn through, with variation of joint shape. As a result, the following conclusions were obtained. (1) In one side fillet welded T-joint, the larger the leg length, the greater the bending fatigue strength. The increase in bending fatigue strength. (2) One side filet welded T-joint with edge preparation showed higher bending fatigue strength than that with twofold-large leg length and without edge preparation. (3) In one side fillet welded T-joint without edge preparation, both manual welding and automatic welding were carried out with same condition. In this case, automatic welding shoed deeper penetration and more increased horizontal leg length than manual welding, so that automatic welding offers grater bending fatigue strength. (4) For one side fillet welded T-joint without edge preparation, the ratio(h/t) of the leg length (h) and the main plate thickness (t) in which toe crack can occur was 1.2 over. (5) In one side fillet welded T-joint with edge preparation, the burn through led to reduced bending fatigue strength. However, this bending fatigue strength was higher than that of one side fillet welded T-joint without edge preparation and with a larger leg length.

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A Study on Fatigue Life Prediction of Welded Joints Through Fatigue Test and Crack Propagation Analysis (피로실험 및 균열진전 해석을 통한 용접부의 피로수명 예측에 관한 연구)

  • Y.C. Jeon;Y.I. Kim;J.K. Kang;J.M. Han
    • Journal of the Society of Naval Architects of Korea
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    • v.38 no.3
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    • pp.93-106
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    • 2001
  • T-joint and hopper knuckle joint models are typical welded joints in ship structure, which are very susceptible to fatigue damage under service condition. Fatigue test and fracture mechanical analysis were performed on these joints to find out characteristics of fatigue behavior. Unified S-N curve was developed from the test results of these two types of joint using hot spot stress concept, and also propagation life was also estimated using Paris' crack propagation law. Residual stress effect on propagation life was considered in calculating propagation life, as was done with thermo-elasto-plastic FE analysis and residual stress intensity factor calculation. Fatigue life of similar kinds of welded joint could be predicted with this unified S-N curve and fracture mechanical analysis technique.

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A Study on the Production Mechanisms of Residual Stress in Welded T-joint of Steel Pipe Member (T형 강관 용접 이음부의 잔류응력 생성기구에 관한 연구)

  • 장경호;장갑철;경장현;이은택
    • Journal of Welding and Joining
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    • v.21 no.6
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    • pp.40-45
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    • 2003
  • Steel members have advantages of resisting torsion and axial compression. In design, residual stresses at the welded joint of T-shape steel pipes are one of the most important points to be considered. In this paper, characteristics of residual stresses of welded joints are clarified by carrying out 3D non-steady heat conduction analysis and 3D thermal elastic-plastic FE-analysis. According to the results, the production mechanism of residual stresses at the welded joint of T-shape steel pipe is clarified. In this paper, circumferential stresses depended on thermal histories but axial and radial stresses were more dependent on geometrical shape than thermal histories. Residual stresses in the axial direction on the lower part of pipe member were tensile, controlled by geometrical shape. However, in case of middle part, residual stresses in all the directions were controlled by thermal histories.

Establishment for Failure Criterion of Adhesively Bonded Joint (접착이음의 파괴 기준 설정을 위한 연구)

  • 이강용;공병석
    • Transactions of the Korean Society of Automotive Engineers
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    • v.8 no.1
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    • pp.183-190
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    • 2000
  • The objective of this work is to develop a criterion for predicting the failure strength of the joints bonded by ductile adhesives. To obtain a criterion, first, fracture tests were carried out for T-peel joint and Single-lap joint with widely differing joints geometries. Then using the fracture loads obtained at tests, the finite element analysis were performed, in which the stresses in the adhesive bonds were calculated in great detail. After examining four epoxy adhesives, it is concluded that the fracture of adhesively bonded joint occurs when the maximum of the ratio of the mean to effective stresses exceeds a constant value which can be determined from analysis and test for each adhesive.

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