• Title, Summary, Keyword: Single-lap Joint

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Stress Analysis Of Wavy Lap Joint (WAVY LAP JOINT 응력 해석)

  • 김위대;양승희
    • Proceedings of the Korean Society For Composite Materials Conference
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    • pp.216-219
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    • 2000
  • The adhesive bonded single-lap joint is due to its intrinsic load eccentricity problem, severe peel stresses concentration occur at both end of the joint. In this paper, new lap-joint is designed to avoid the singular peel stress, and to compare the stresses of the middle adhesive layer between the single-lap joint and the wavy-lap joint. Two adherend lay-up, i.e., [90/0/90/0]$_{2s}$ and [0/90/0/90]$_{2s}$ were consider in the study.

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Refined 3-D Stress Analysis of Composite Wavy-Lap Joint (복합재료 Wavy-Lap Joint의 3-D 상세 응력 해석)

  • Shin, Hun;Lee, Chang-Sung;Kim, Seung-Jo;Kim, Wi-Dae
    • Proceedings of the Korean Society For Composite Materials Conference
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    • pp.168-171
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    • 2001
  • Due to intrinsic load eccentricity, severe peel stress concentration occurs at both ends of the single-lap joint. To avoid load eccentricity as well as the singular tensile peel stress in the joint interface, composite wavy-lap joint is proposed. In this paper, refined 3-D stress analysis of wavy-lap joint is performed by finite element method using parallel mutifrontal solver. Analysis results show that the singular tensile peel stress concentration is totally avoided in wavy-lap joint, and that loads are more evenly transferred over the length of the joint. Therefore, the strength of wavy-lap joint is significantly higher than that of conventional single-lap joint. And it is believed that even higher strengths can be obtained by optimizing the new design configuration.

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The Torque Transmission Capacities of the Adhesive Tubular Lap Joint (접착제로 접착된 원형 겹치기이음의 토크 전달특성 연구)

  • 최진호;이대길
    • Transactions of the Korean Society of Mechanical Engineers
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    • v.18 no.1
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    • pp.85-92
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    • 1994
  • With the wide application of fiber-reinforced composite meterial in aircraft space structures and robot arms, the design and manufacture of composite joints have become a very important research area because they are often the weakest areas in composite structure. In this paper, the torque transmission capacities of the adhesive tubular single lap joint and double lap joint were studied. The stress and torque transmission capacity of the adhesive joints were analyzed by the finite element method and compared to the experimental results. The torque capacity of the double lap joint was increased 2.7 times over that of the single lap joint. Also, the fatigue limit of the double lap joint was increased 16 times over that of the single lap joint.

Study on Bearing Response of Single Lap Riveted Joint (Single Lap Riveted Joint의 베어링 거동 연구)

  • Heo Kwang-Su;Yoon Sung-Ho;Jeong Jong-Cheol;Lee Sang-Jin;Kim Jung-Seok
    • Proceedings of the KSR Conference
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    • pp.326-331
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    • 2005
  • In this study, bearing response in single lap riveted joint is investigated by menas of single lap shear specimens with different types of adherend and fastener. Single lap shear specimen consists of adherend of SUS403 and carbon fabric/epoxy composite. Rivet of Avdel 2691 with 9.6mm diameter is used. Two types of fastener in single lap riveted joint are considered. One is a single lap shear specimen with single fastener, and the other is a single lap shear specimen with double fasteners. Especially, in case of single lap shear specimen with single fastener, the width of the specimen is varied as 2D, 3D, 4D, 6D at a fixed edge distance of 3D. Also the edge distance of the specimen is varied as 1.0D, 1.5D, 2.0D, 2.5D, 3.0D at a fixed width of 4D. In case of single lap shear specimen with double fasteners, two types of specimen are considered. One is a specimen with the width of 6D and edge distance of 3D. The other is a specimen with the width of 4D and edge distance of 2D. Here D designates the hole diameter for riveted joint.

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An Analytic Study for the Adhesively Bonded Tubular Double Lap Joint (원형 이중겹치기 접착조인트의 해석해에 관한 연구)

  • 이수정;이대길
    • Transactions of the Korean Society of Mechanical Engineers
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    • v.18 no.6
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    • pp.1412-1420
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    • 1994
  • The adhesively bonded tubular double lap joint has better torque transmission capability and reliability in bonding operation than the single lap joint. In this paper, an analytic solution for the torque transmission capabilities and stress distributions of the adhesively bonded tubular double lap joint was derived assuming the linear properties of the adhesive and adherends. From the calculation, it was found that the torque transmission capabilities of the double lap joint was more than 40% larger compared to that of the single lap joint.

A Study on the Torque Transmission Characteristics of Adhesively Bonded Composite Drive Shafts (접착제로 접합된 복합재료 구동축의 토크 전달특성에 관한 연구)

  • 김원태;김기수;이대길
    • Transactions of the Korean Society of Mechanical Engineers
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    • v.17 no.8
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    • pp.1980-2000
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    • 1993
  • The stresses and torque transmission capabilities of adhesively bonded circular, hexagonal and elliptical lap joints were analyzed by the finite element and compared with the experimental results. The adherends of the joints were composed of carbon fiber/epoxy composite shafts and steel shafts. In calculating the torque transmission capabilities, the linear laminate properties of the composite material and the nonlinear shear properties of the adhesive were used. Using this method, the torque transmission capabilities of adhesively bonded lap joints could be obtained within 10% error compared to the experimental results except some single lap joints. The experiments revealed that the hexagonal joint had the best torque transmission capability from the single lap joints and the double lap joint had better torque transmission than the single lap joint.

Strength Evaluation of Adhesive Bonded Joint for Light Weight Structure by Single-Lab Joint Test (단면 겹치기 이음 시험에 의한 경량구조물용 접착 이음강도의 평가)

  • 이강용;김준범;최홍섭;우형표
    • Transactions of the Korean Society of Automotive Engineers
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    • v.5 no.2
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    • pp.87-93
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    • 1997
  • The bonding strength evaluation of light weight materials for electrical vehicle applications has been performed through single lap joint tests in which the design parameters such as fillet, joint style, adherend, bonding overlap length,bonding thickness, and environmental condition(soaking time in $25^{\circ}C$ water) are considered. It is experimentally oberved that lap shear strength of joint increases for higher fillet height, longer overlap length, and thinner bonding layer thickness. Al-Al adherend combination shows much higher lap shear strength than AL-FRP and FRP-FRP adherend combinations. Riveting at adhesive bonded joint of AL-AL adherend combination makes lap shear strength decrease. Effect of soaking time on lap shear strength is negligible.

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Structural Behavior Evaluation of Mg-GFRP Composite Single-Lap Bonded Joints With Different End Shapes (한 끝단 형상에 따른 마그네슘 합금과 유리섬유 복합소재 단일겹치기 본드 조인트 거동 분석)

  • Kim, Jung-Seok;Im, Jae-Young;Lee, Woo-Geun
    • Journal of the Korean Society for Railway
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    • v.17 no.6
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    • pp.391-396
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    • 2014
  • In this study, the strength of magnesium-GFRP/epoxy single-lap bonded joints are experimentally evaluated with different end shapes. In order to achieve this, four different single-lap joints with different end shapes are fabricated and the failure load is measured under tensile loading tests. From the test results, the single-lap joint with a square end exhibits the lowest failure load while the single-lap joint with reverse tapering and a spew fillet has the highest stress values. It has 11.1% higher failure strength than the single-lap joint with a square end.

The Evaluation of Tensile-shear Strength on the Al-Alloy Single-lap Adhesive Joints (AI합금 단순겹치기 접착이음의 인장-전단강도 평가)

  • Oh, S. K.;Yu, Y. C.;Jeong, E. S.;Yi, W.
    • Proceedings of the Korean Society of Precision Engineering Conference
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    • pp.567-571
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    • 1997
  • Recently, automobile industry has led to increasing use of aluminum alloy for weight reduction. Automobile made of aluminum alloy can be given lighter, stronger and a harder surface by anodizing than one made of steel-alloy. In this paper, we investigate the influence of lap length, adherend thickness and adhesive thickness on adhesive strength of single-lap adhesive joints by conducting tensile-shear tests. Single-lap adhesive joints of aluminum was calculated using joint factor by using adhesive length, adherend thickness of specimen.

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Fatigue Failure Model for the Adhesively Bonded Tubular Single Lap Joint Under Torsional Fatigue Loadings (비틀림 하중하에서의 튜브형 단면겹치기 접착조인트의 피로파괴모델에 관한 연구)

  • 이수정;이대길
    • Transactions of the Korean Society of Mechanical Engineers
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    • v.19 no.8
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    • pp.1869-1875
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    • 1995
  • The adhesively bonded tubular single lap joint shows a nonlinear relationship between the applied torque and the resulting displacement under the static-torsional loading, which is induced from the nonlinear properties of the adhesive. However the torque transmission capability in the case of the dynamic-torsional loading is much less than that in the case of the static-torsional loading, the stress level of the adhesive is usually in the region of the linear stress and strain relation and the stress distributions of the joint can be obtained by the linear analysis. In this paper, a failure model for the adhesively bonded tubular single lap joint under the torsional fatigue loading was developed with respect to the adhesive thickness that was a critical factor in predicting the static torque transional-cyclic loadings was proposed.