• Title/Summary/Keyword: Double-cantilever beam

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A Study on the Interlaminar Fracture Toughness of Glass Fiber Reinforced Plastic Comosites (GFRP 복합재료의 층간파괴인성치에 관한 연구)

  • 박기호
    • Journal of the Korean Society of Fisheries and Ocean Technology
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    • v.35 no.4
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    • pp.410-420
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    • 1999
  • The value of the mode I interlamina fracture toughness, GIC, is calculated by experimental compliance method, modified compliance method and beam theory. The value of the mode II interlamina fracture toughness, GIC, is evaluated by beam method, theory beam theory and compliance method. This paper describes the effect of load pint displacement rate and speicimen geometries for mode I and II interlaminar fracture toughness of glass fiber reinforced plastic composites by using double cantilever beam (DCB) and end notched flexure (ENF) specimen. For the load point displacement rate of increases whereas the value of 2,6 and 10 mm/min the value of GIC decrease as load point displacement rate increases whereas the value of GIC is found to be no significant effect. The value of GIC decreases as initial crack length increases. The fractured surface of the DCB and ENF samples are examined by scanning electron microscopy (SEM).

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Comparison of Quantitative Interfacial Adhesion Energy Measurement Method between Copper RDL and WPR Dielectric Interface for FOWLP Applications (FOWLP 적용을 위한 Cu 재배선과 WPR 절연층 계면의 정량적 계면접착에너지 측정방법 비교 평가)

  • Kim, Gahui;Lee, Jina;Park, Se-hoon;Kang, Sumin;Kim, Taek-Soo;Park, Young-Bae
    • Journal of the Microelectronics and Packaging Society
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    • v.25 no.2
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    • pp.41-48
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    • 2018
  • The quantitative interfacial adhesion energy measurement method of copper redistribution layer and WPR dielectric interface were investigated using $90^{\circ}$ peel test, 4-point bending test, double cantilever beam (DCB) measurement for FOWLP Applications. Measured interfacial adhesion energy values of all three methods were higher than $5J/m^2$, which is considered as a minimum criterion for reliable Cu/low-k integration with CMP processes without delamination. Measured energy values increase with increasing phase angle, that is, in order of DCB, 4-point bending test, and $90^{\circ}$ peel test due to increasing roughness-related shielding and plastic energy dissipation effects, which match well interfacial fracture mechanics theory. Considering adhesion specimen preparation process, phase angle, measurement accuracy and bonding energy levels, both DCB and 4-point bending test methods are recommended for quantitative adhesion energy measurement of RDL interface depending on the real application situations.

Effect of Co Interlayer on the Interfacial Reliability of SiNx/Co/Cu Thin Film Structure for Advanced Cu Interconnects (미세 Cu 배선 적용을 위한 SiNx/Co/Cu 박막구조에서 Co층이 계면 신뢰성에 미치는 영향 분석)

  • Lee, Hyeonchul;Jeong, Minsu;Kim, Gahui;Son, Kirak;Park, Young-Bae
    • Journal of the Microelectronics and Packaging Society
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    • v.27 no.3
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    • pp.41-47
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    • 2020
  • The effect of Co interlayer on the interfacial reliability of SiNx/Co/Cu thin film structure for advanced Cu interconnects was systematically evaluated by using a double cantilever beam test. The interfacial adhesion energy of the SiNx/Cu thin film structure was 0.90 J/㎡. This value of the SiNx/Co/Cu thin film structure increased to 9.59 J/㎡.Measured interfacial adhesion energy of SiNx/Co/Cu structure was around 10 times higher than SiNx/Cu structure due to CoSi2 reaction layer formation at SiNx/Co interface, which was confirmed by X-ray photoelectron spectroscopy analysis. The interfacial adhesion energy of SiNx/Co/Cu structure decreased sharply after post-annealing at 200℃ for 24 h due to Co oxidation at SiNx/Co interface. Therefore, it is required to control the CoO and Co3O4 formation during the environmental storage of the SiNx/Co/Cu thin film to achieve interfacial reliability for advanced Cu interconnections.

Evaluation of Fracture Behavior of Adhesive Layer in Fiber Metal Laminates using Cohesive Zone Models (응집영역모델을 이용한 섬유금속적층판 접착층의 모드 I, II 파괴 거동 물성평가)

  • Lee, Byoung-Eon;Park, Eu-Tteum;Ko, Dae-Cheol;Kang, Beom-Soo;Song, Woo-Jin
    • Composites Research
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    • v.29 no.2
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    • pp.45-52
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    • 2016
  • An understanding of the failure mechanisms of the adhesive layer is decisive in interpreting the performance of a particular adhesive joint because the delamination is one of the most common failure modes of the laminated composites such as the fiber metal laminates. The interface between different materials, which is the case between the metal and the composite layers in this study, can be loaded through a combination of fracture modes. All loads can be decomposed into peel stresses, perpendicular to the interface, and two in-plane shear stresses, leading to three basic fracture mode I, II and III. To determine the load causing the delamination growth, the energy release rate should be identified in corresponding criterion involving the critical energy release rate ($G_C$) of the material. The critical energy release rate based on these three modes will be $G_{IC}$, $G_{IIC}$ and $G_{IIIC}$. In this study, to evaluate the fracture behaviors in the fracture mode I and II of the adhesive layer in fiber metal laminates, the double cantilever beam and the end-notched flexure tests were performed using the reference adhesive joints. Furthermore, it is confirmed that the experimental results of the adhesive fracture toughness can be applied by the comparison with the finite element analysis using cohesive zone model.

Numerical Study on Inverse Analysis Based on Levenberg-Marquardt Method to Predict Mode-I Adhesive Behavior of Fiber Metal Laminate (섬유금속적층판의 모드 I 접합 거동 예측을 위한 Levenberg-Marquardt 기법 기반의 역해석 기법에 관한 수치적 연구)

  • Park, Eu-Tteum;Lee, Youngheon;Kim, Jeong;Kang, Beom-Soo;Song, Woojin
    • Composites Research
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    • v.31 no.5
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    • pp.177-185
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    • 2018
  • Fiber metal laminate (FML) is a type of hybrid composites which consist of metallic and fiber-reinforced plastic sheets. As the FML has a drawback of the delamination that is a failure of the interfacial adhesive layer, the nominal stresses and the energy release rates should be determined to identify the delamination behavior. However, it is difficult to derive the nominal stresses and the energy release rates since the operating temperature of the equipment is restricted. For this reason, the objective of this paper is to predict the mode-I nominal stress and the mode-I energy release rate of the adhesive layer using the inverse analysis based on the Levenberg-Marquardt method. First, the mode-I nominal stress was assumed as the tensile strength of the adhesive layer, and the mode-I energy release rate was obtained from the double cantilever beam test. Next, the finite element method was applied to predict the mode-I delamination behavior. Finally, the mode-I nominal stress and the mode-I energy release rate were predicted by the inverse analysis. In addition, the convergence of the parameters was validated by trying to input two cases of the initial parameters. Consequently, it is noted that the inverse analysis can predict the mode-I delamination behavior, and the two input parameters were converged to similar values.

Shear Experiment and Simulation Analysis at Bonded Surface of Specimen Tapered Double Cantilever Beam with Expanded Aluminum (발포 알루미늄으로 된 경사진 이중외팔보 시험편의 접착면에서의 전단 실험 및 시뮬레이션 해석)

  • Sun, Hong-Peng;Cheon, Seong S.;Cho, Jae-Ung
    • Composites Research
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    • v.27 no.6
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    • pp.248-253
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    • 2014
  • In this study, tapered double cantilever beam specimens are designed with the variable of angle to investigate the fracture property at the bonded surface of adjoint structure. These specimens are made with four kinds of models as the length of 200 mm and the slanted angles of bonded surfaces on specimens of $6^{\circ}$, $8^{\circ}$, $10^{\circ}$ and $12^{\circ}$. By investigating experiment and analysis result of these specimens, the maximum loads are happened at 120 N, 137 N, 154 N and 171 N respectively in cases of the specimens with slanted angles of $6^{\circ}$, $8^{\circ}$, $10^{\circ}$ and $12^{\circ}$. As the analysis result approach the experimental value, it is confirmed to have no much difference with the values of experiment and analysis. It is thought that the material property can be investigated effectively on shear behavior of the material composed of aluminum foam bonded with adhesive through simulation instead of experiment by applying this study method.

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.

Effects of Ar/N2 Two-step Plasma Treatment on the Quantitative Interfacial Adhesion Energy of Low-Temperature Cu-Cu Bonding Interface (Ar/N2 2단계 플라즈마 처리에 따른 저온 Cu-Cu 직접 접합부의 정량적 계면접착에너지 평가 및 분석)

  • Choi, Seonghun;Kim, Gahui;Seo, Hankyeol;Kim, Sarah Eunkyung;Park, Young-Bae
    • Journal of the Microelectronics and Packaging Society
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    • v.28 no.2
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    • pp.29-37
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    • 2021
  • The effect of Ar/N2 two-step plasma treatment on the quantitative interfacial adhesion energy of low temperature Cu-Cu bonding interface were systematically investigated. X-ray photoelectron spectroscopy analysis showed that Ar/N2 2-step plasma treatment has less copper oxide due to the formation of an effective Cu4N passivation layer. Quantitative measurements of interfacial adhesion energy of Cu-Cu bonding interface with Ar/N2 2-step plasma treatment were performed using a double cantilever beam (DCB) and 4-point bending (4-PB) test, where the measured values were 1.63±0.24 J/m2 and 2.33±0.67 J/m2, respectively. This can be explained by the increased interfacial adhesion energy according phase angle due to the effect of the higher interface roughness of 4-PB test than that of DCB test.

Failure Paths Analyses of the Leadframe/EMC System

  • Lee, H.Y.;Kim, S.R.
    • Journal of the Microelectronics and Packaging Society
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    • v.7 no.2
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    • pp.7-12
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    • 2000
  • Copper-based leadframe sheets were oxidized in a black-oxide forming solution, and molded with epoxy molding compound (EMC) to form sandwiched double-cantilever beam (SDCB) specimens. The adhesion strength of leadframe/EMC interface was measured in terms of fracture toughness by using SDCB specimens and the fracture surfaces were analyzed by various equipments such as glancing-angle XRD, AFM, and SEM. Results showed that three types of failure paths, which were closely related to the surface condition of leadframes before molding.

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MODEL I FRACTURE IN CONCRETE USING CRACK LINE WEDGE LOADED DOUBLE CANTILEVER BEAM (Clwl-Dcb식편을 이용한 콘크리트의 개구형 파괴)

  • 송정근
    • Magazine of the Korea Concrete Institute
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    • v.1 no.2
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    • pp.101-112
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    • 1989
  • 콘크리트에 선형파괴역할의 적용가능성을 연구한 많은 논문이 발표되었다. 본 논문에서는 CLWL-DCB식편을 이용한 콘크리트의 개구형파괴를 연구하였다. 표면구열길이는 리프리카를 사용하여 직접적인 방법으로 측정하였고, 이 결과은 실험에서 얻은 측정가중과 구열개구변위의 관계곡선을 이용하여 분석하였다. 감계응력강도계수와 감계구열선단위는 Two Parameter 모델을 사용하여 유효구열선단에서 구하였다. LEFM 구열단면과 실험으로 구한 구열단면으로부터 폐쇄압력을 얻기 위하여 중첩법을 적용하여 5종의 균열모델을 평가하였다.