• Title/Summary/Keyword: 이중외팔보

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A Study on Fracture Property of Adhesive Interface at Tapered Double Cantilever Beam with Inhomogeneous Composite Material due to Loading Conditions of In-plane and Out-plane (면내 및 면외 하중 조건들에 따른 이종 복합 소재를 가진 경사진 이중외팔보에서의 접착계면의 파괴 특성 연구)

  • Lee, Jung-Ho;Kim, Jae-Won;Cheon, Seong-Sik;Cho, Jae-Ung
    • Composites Research
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    • v.33 no.6
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    • pp.401-407
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    • 2020
  • At the engineering and industrial areas, the lightweight composite material has been substituted with the metals, such as steel at the structural parts. This composite material has been applied by the adhesive bonding method, as well as the joint methods with rivets, welds or bolts and nuts. The study on the strength characteristics of adhesive interface is necessarily required in order to apply the method to composite materials. CFRP specimens as the fiber reinforced plastic composites were manufactured easily and this study was carried out. The static experiments were performed under the loading conditions of in-plane and out-plane shears with the inhomogeneous composite TDCB specimens with CFRP, aluminum (Al6061), and aluminum foam (Al-foam). Through the result of this study, the durability on the inhomogeneous composite structure with adhesive interface was investigated by examining the fracture characteristic and the point in time.

Fracture Characteristic of Double Cantilever Beam Specimen Using Lightweight Material at Sliding Mode (미끄러짐 모드에서의 경량 재료를 이용한 이중외팔보 시험편의 파손 특성)

  • Kim, Jae-Won;Cho, Jae-Ung
    • Journal of the Korean Society of Manufacturing Process Engineers
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    • v.20 no.3
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    • pp.16-23
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    • 2021
  • The fracture characteristic of the bonded interface under the application of a sliding load to a double cantilevered specimen manufactured using lightweight material was examined. Inhomogeneously bonded materials such as Al6061-T6, CFRP, and CFRP-Al were employed. In the experiment, the specimen was loaded on both directions by applying a shearing load to the bonding interface. The experimentally obtained stress, specific strength and energy release rate values were examined. CFRP exhibited excellent specific strength. The experimental results demonstrated that the inhomogeneous bonded material CFRP-Al exhibited an overall high performance in comparison with the single materials.

Experiment and Analysis on Impact of Tapered Double Cantilever Beam with Aluminum Alloy (알루미늄 합금으로 된 경사진 이중외팔보의 충돌에 대한 실험 및 해석)

  • Gao, Teng;Cho, J.U.;Cheon, Seong S.
    • Composites Research
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    • v.27 no.2
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    • pp.72-76
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    • 2014
  • This study is investigated by experiments and analyses at rates of 2.5m/s, 7.5m/s and 12.5m/s on the impact of tapered double cantilever beam specimens with aluminium alloy. It aims to examine the mechanical property of aluminum alloy by evaluating energy release rate and equivalent stress happened at the bonded part of specimen. Because bonding force remains after the separation of specimen, the energy release rate at the bonded part becomes highest. As crack propagates and the high stress happens at the end of the bonded part, the maximum equivalent stress becomes higher at the last stage, regardless of impact rate. These results of experiments and analyses are the data necessary to develop the safe design of composite material to prevent crack propagation due to impact.

Impact Behavior at Composite Material of Aluminium Double Cantilever Beam with Two Kinds of Materials (이종재료의 알루미늄 이중 외팔보 복합재의 충격 거동)

  • Cho, Jae-Ung
    • Journal of the Korea Academia-Industrial cooperation Society
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    • v.8 no.3
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    • pp.421-426
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    • 2007
  • This study was analyzed dynamically by finite element method about the results of experiments which the double cantilever beam specimens with two kinds of materials were applied by impact load. And they were compared with each other as the simulation data applied onto impact velocities of 6.4 and 18.47 m/s. The crack energy release rate, force and displacement of block were calculated numerically by computer. As the numerical simulation data of specimen analyzed in this study approached the experimental data, the inspection of this specimen model suggested in this paper could be reasonable for the numerical simulation.

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Adhesive Fracture Characteristic of DCB Specimen due to Single and Heterogeneous Materials under Tearing Load (찢김 하중에서 단일 재료 및 이종 접합 재료에 따른 이중외팔보 시험편의 접착제 파손 특성)

  • Kim, Jae-Won;Cho, Jae-Ung
    • Journal of the Korean Society of Manufacturing Process Engineers
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    • v.20 no.4
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    • pp.127-134
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    • 2021
  • In this study, the adhesive fracturing characteristics of a DCB specimen due to single and heterogeneous bonding materials under tearing load was investigated. The experiments were conducted to examine the fracturing properties of the adhesive DCB specimen. As an experimental condition, a forced displacement of 3mm/min was applied to one side while the other side was fixed. As a result of the experiment, it was found that the AL6061-T6 material was superior to the CFRP material in terms of maximum stress, specific strength, and energy release rate when compared to the adhesive fracturing property of a single material. We tested CFRP-AL, a heterogeneous bonding material, and compared its experimental results to the results from the single materials. Based on these results, CFRP-AL with a heterogeneous bonding material was observed to have the superior structural safety compared to single materials for the mode III fracture type.

Convergence Study on Damage and Static Fracture Characteristic of the Bonded CFRP structure with Laminate angle (적층 각도를 가진 CFRP 접착 구조물의 파손 및 정적 파괴 특성에 관한 융합 연구)

  • Lee, Jung-Ho;Kim, Eundo;Cho, Jae-Ung
    • Journal of the Korea Convergence Society
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    • v.10 no.1
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    • pp.155-161
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    • 2019
  • As composite is the light weight material whose durability and mechanical property are more superior than the existing general material. By taking notice of the composite with light weight, this study was about to investigate the static fracture characteristic of the bonded CFRP structure jointed with adhesive. Also, CFRP double cantilever beam with the variable of laminate angle was designed and the static fracture analysis was carried out. The laminate angles of CFRP double cantilever beam designed for this study were $30^{\circ}$, $45^{\circ}$ and $60^{\circ}$ individually. As the study result, the specimen with the laminate angle of $45^{\circ}$ was shown to have the durability better than those with the layer angles of $30^{\circ}$ and $45^{\circ}$. It was checked that the specimen with the laminate angle of $30^{\circ}$ had the weakest durability among all specimens. The damage data of the bonded CFRP structure by laminate angle could be secured through this study result. As the damage data of bonded interface obtained on the basis of this study result are utilized, the esthetic sense can be shown by being grafted onto the machine or structure at real life.

Fracture Behavior of Adhesive-Bonded Aluminum Foam with Double Cantilever Beam (접착제로 접합된 이중외팔보 알루미늄폼의 파괴 거동에 관한 연구)

  • Bang, Hye-Jin;Lee, Sang-Kyo;Cho, Chongdu;Cho, Jae-Ung;Choi, Hae-Kyu
    • Transactions of the Korean Society of Mechanical Engineers A
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    • v.38 no.5
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    • pp.521-526
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    • 2014
  • In this study, closed-cell aluminum foam with an initial crack was investigated to produce an axial load-time graph. Using the 10-kN Landmarks of MTS Corporation, a 15-mm/min velocity of mode I shape was applied to the aluminum foam specimen using the displacement control method. ABAQUS 6.10 simulation was used to model and analyze the identical model in three dimensions under conditions identical to those of the experiment. The energy release rate was calculated on the basis of an axial load-displacement graph obtained from the experiment and a transient image of the crack length, and then an FE model was analyzed on the basis of this fracture energy condition. The relation between load and displacement was discussed; it was found that the aluminum foam deformed somewhat less than the adhesive layer owing to the difference in elastic modulus.

Study on Structural Analysis of DCB Structure with Aluminum Foam (알루미늄 폼을 갖는 DCB 구조체의 구조해석에 관한 연구)

  • Choi, Hae-Kyu;Kim, Sei-Hwan;Cho, Jae-Ung
    • Proceedings of the KAIS Fall Conference
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    • 2012.05b
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    • pp.617-619
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    • 2012
  • 본 논문에서는 알루미늄 폼 복합재료로 된 DCB(이중외팔보) 구조체의 파괴 거동을 시뮬레이션 해석하였다. 시뮬레이션 해석에 사용된 모델은 영국 공업규격과 ISO국제규격에 의거하여 3D모델을 설계하였다. 해석 결과 모델의 두께가 두꺼울수록 발생한 크랙의 길이가 길게 나타났고, 높은 하중이 발생하였다. 이와 같은 연구에서 얻어진 해석 결과를 통하여 알루미늄 폼 재질로 접합된 실제 복합재 구조물에 적용시켜 파괴거동을 분석하고 그 기계적인 특성을 파악할 수 있다.

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Detection of Interface Crack Using Ultrasonic Method in Adhesively Bonded Joints (초음파 탐상법을 이용한 접착이음에 대한 계면균열의 검출)

  • Chung, Nam-Yong;Lee, Myung-Dae;Park, Sung-Il
    • Proceedings of the KSME Conference
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    • 2000.04a
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    • pp.97-102
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    • 2000
  • It is well recognized that the ultrasonic methods is one of the most common and reliable nondestructive testing(NDT) methods for the quantitative estimation of defects in welded structures. However, NDT techniques applying for adhesively bonded joints have not been clearly established yet. In this paper, the detection of interface crack by the ultrasonic method was applied for the measurement of interfacial crack length in the adhesively bonded joints of double-cantilever beam(DCB). The optimum condition of transmission coefficients in the adhesively bonded joints and it's experimental accuracy by the ultrasonic method have been investigated. The experimental values are in good agreement with the computed results by boundary element method(BEM) and Ripling's equation.

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Delamination Analysis of Orthotropic Laminated Plates Using Moving Nodal Modes (이동절점모드를 사용한 직교이방성 적층평판의 층간분리해석)

  • Ahn, Jae-Seok
    • Journal of the Computational Structural Engineering Institute of Korea
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    • v.25 no.4
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    • pp.293-300
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    • 2012
  • In this study, the delamination analysis has been implemented to investigate the initiation and propagation of crack in composite laminates composed of orthotropic materials. A simple modeling was achieved by moving nodal technique without re-meshing work when crack propagation occurred. This paper aims at achieving two specific objectives. The first is to suggest a very simple modeling scheme compared with those applied to conventional h-FEM based models. To verify the performance of the proposed model, analysis of double cantilever beams with composite materials was implemented and then the results were compared with reference values in literatures. The second one is to investigate the behavior of interior delamination problems using the proposed model. To complete these objectives, the full-discrete-layer model based on Lobatto shape functions was considered and energy release rates were calculated using three-dimensional VCCT(virtual crack closure technique) based on linear elastic fracture mechanics.