• Title/Summary/Keyword: single lap

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Failure Mode and Strength of Unidirectional Composite Single Lap Bonded Joints II. Failure Prediction (일방향 복합재료 Single Lap 접합 조인트의 파손 모드 및 파손 강도 II. 파손 예측)

  • Yi Young-Moo;Kim Chun-Gon;Kim Kwang-Soo
    • Composites Research
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    • v.18 no.1
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    • pp.1-9
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    • 2005
  • A methodology is presented for the failure prediction of composite single-lap bonded joints considering both of composite adherend failure and bondline failure. An elastic-perfectly plastic model of adhesive and a delamination failure criterion are used in the methodology. The failure predictions have been performed using finite element method and the proposed methodology. The failure prediction results such as failure mode and strength have very good agreements with the test results of joint specimens with various bonding methods and parameters. The influence of variations in the effective strength (that is, adhesion performance) and plastic behavior of adhesive on the failure characteristics of composite bonded Joints are investigated numerically. The numerical results show that optimal joint strength is archived when adhesive and delamination failure occur in the same time.

A study on the bonding strength of co-cured T800/epoxy composite-aluminum single lap joint according to the forming and additional pressures (동시 경화법으로 제조된 T800/에폭시 복합재료-알루미늄 단면겹치기조인트의 성형압력 및 부가압력에 따른 접착강도에 관한 연구)

  • Son, Dae-Sung;Bae, Ji-Hun;Chang, Seung-Hwan
    • Composites Research
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    • v.24 no.5
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    • pp.23-28
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    • 2011
  • In this paper, the bonding strengths of co-cured T800 carbon/epoxy composite-aluminum single lap joints with and without additional pressures were investigated using the pressure information induced by the fiber tension during a filament winding process. The specimens of all the tests were fabricated by an autoclave vacuum bag de-gassing molding being controlled forming pressures (absolute pressures of 0.1MPa, 0.3MPa and 0.7MPa including vacuum). A special device which can act uniform additional pressures on the joining part of the single lap joint specimen was designed to measure the bonding strengths of composite-aluminum liners of type III hydrogen pressure vessel fabricated by a filament winding process. After the three different additional pressures (absolute pressures of 0.1MPa, 0.3MPa and 0.7MPa) were applied to the specimens the effect of the additional pressures on the bonding strengths of the co-cured single-lap joints were evaluated.

Stress Reduction Methods of GFRP/Mg Single Lap Bonded Joints : Finite Element Analysis (GFRP/Mg 단일겹치기 접착 체결부의 응력집중 저감에 관한 연구 : 유한요소해석)

  • Kim, Jung-Seok;Yoon, Hyuk-Jin;Hwang, Jae-Yeon
    • Journal of the Korean Society for Railway
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    • v.14 no.2
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    • pp.94-99
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    • 2011
  • In this study, the stress reduction effect was evaluated for GFRP/Mg single lap bonded joints according to six different adherend shapes. Six different types of the single lap joint specimen were modeled and assessed using geometrically nonlinear finite element analysis. Moreover, three dimensional effect of stress distribution for the different adherend shapes was investigated. From the analysis, the dissimilar single lap bonded joint with the normal tapering and without the spew fillet (model 2) showed the highest stress values. In contrast, the peel stress values of both the square ended adherends with the spew fillet (model 3) and the reverse tapered adherends with the spew fillet (model 5) were 65.8% and 65.5% lower than the reference model.

Growth of organic single crystals of L-arginine phosphate monohydrate and tris(hydroxymethyl)aminomethane sulfate (L-arginine phosphate monohydrate와 tris(hydroxymethyl)-aminomethane sulfate 유기 단결정의 육성)

  • Chang-Sung Lim;Pan-Chae Kim
    • Journal of the Korean Crystal Growth and Crystal Technology
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    • v.4 no.1
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    • pp.105-110
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    • 1994
  • L-arginine phosphate monohydrate (LAP) and tris(hydroxymethyl)aminomethane sulfate (THAMS) are new organic nonlinear optical materials for the device application such as the frequency conversion of laser radiation. In this work the single crystals of LAP and THAMS have been grown by the falling temperature method and the temperature difference method. The conditions of the growth parameters were presented and the grown crystals were characterized by means of optical microscopy, XRD and FTIR.

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The Simulation of Notch Length on the Stress Distribution in Lap Zone of Single Lap Joint with a Centered Notch

  • Yan, Zhanmou;You, Min;Yi, Xiaosu;Zheng, Xiaoling
    • Journal of Adhesion and Interface
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    • v.7 no.4
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    • pp.18-23
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    • 2006
  • The influence of the notch length on the stress distribution of mid-bondline and adherend was investigated using elasto-plastic finite element method. The results from the simulation showed that peak stress of mid-bondline decreased markedly as adherend with notch in the middle of lap zone, and the stress in the middle of joint with low stress originally increased evidently. All the peak stresses decreased firstly and increased again as the length of notch increased. The relative higher peak stress appeared at the point near the notch of adherend where might be failed previously during the loading procedure.

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Tensile load bearing capacities of co-cured single and double lap joints (외면 및 양면겹치기 동시경화조인트의 인장하중 전달용량에 관한 연구)

  • 신금철;이정주
    • Proceedings of the Korean Society For Composite Materials Conference
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    • 2001.10a
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    • pp.95-98
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    • 2001
  • Co-cured joining method is an efficient joining technique because both curing and bonding processes for the composite structures can be achieved simultaneously. It requires neither an adhesive nor a surface treatment of the composite adherend because the excess resin, which is extracted from composite materials during consolidation, accomplishes the co-cured joining process. In this paper, we considered three bond parameters, affecting tensile load bearing capacity of the co-cured single and double lap joints. Filially, we nave presented optimal bonding conditions for co-cured single and double lap joints with steel and composite adherends under tensile loads.

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Behavior and modeling of single bolt lap-plate connections

  • Rex, Clinton O.;Easterling, W. Samuel
    • Steel and Composite Structures
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    • v.2 no.4
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    • pp.277-296
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    • 2002
  • A research investigation of single bolt lap-plate connection load-deformation behavior is presented. Each important characteristic of this behavior is evaluated and two methods for analytically approximating the behavior are developed and presented. The first of these methods is a component method in which the behavior of the connection is modeled as a combination of the behavior of the parts. The second method utilizes a number of parametric relationships that relate the connection parameters to coefficients of two non-linear continuous analytical curves. The test results from four independent experimental programs that investigated the behavior of single bolt lap-plate connections are used in the development and verification of these methods.

Failure Prediction of Composite Single Lap Bonded Joints (복합재료 Single Lap 접합 조인트의 파손 예측)

  • Kim Kwang-Soo;Jang Young-Soon;Yi Yeong-Moo
    • Proceedings of the Korean Society For Composite Materials Conference
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    • 2004.10a
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    • pp.73-77
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    • 2004
  • Failure predictions of composite single-lap bonded joints were performed considering both of composite adherend failure and bondline failure. An elastic-perfectly plastic model of adhesive and a delamination failure criterion are used. The failure prediction results such as failure mode and strength have very good agreements with the test results of joint specimens with various bonding methods and parameters. The influence of variations in the effective strength (that is, adhesion performance) and plastic behavior of adhesive on the failure characteristics of composite bonded joints are investigated numerically. The numerical results show that optimal joint strength is archived when adhesive and delamination failure occur in the same time.

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Analysis on the Interface Edge Crack in Aluminum Bonded Single Lap-joint (알루미늄 단순겹치기 접착이음의 에지계면균열에 대한 연구)

  • Yu, Y.C.;Park, J.H.;Jeong, E.S.;Yi, W.
    • Proceedings of the Korean Society of Precision Engineering Conference
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    • 1997.04a
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    • pp.655-659
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    • 1997
  • The analysis of cracks at the interface between dissimilar materilar has received a great deal of attention in recent years. In this paper we conducted the static tensile test for the aluminum bonded single lap-joint with the interface edge crack. Comparing this results, that is ultimate load and strain value of aluminum adherend by strain gauge with the fracture mechanics parameters, compliance and stress intensity factors acquied from the boundary element analysis, we concluded that there are critical value of crack length to provoke the interface fracture.

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