• Title, Summary, Keyword: 섬유금속적층판

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Numerical Study on Performance Evaluation of Impact Beam for Automotive Side-Door using Fiber Metal Laminate (자동차 측면 도어의 섬유금속적층판을 적용한 임펙트 빔의 수치해석에 의한 성능 평가)

  • Park, Eu-Tteum;Kim, Jeong;Kang, Beom-Soo;Song, Woo-Jin
    • Composites Research
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    • v.30 no.2
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    • pp.158-164
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    • 2017
  • The fiber metal laminate is a type of hybrid materials laminated thin metallic sheets with fiber reinforced plastic sheets. The laminate has been researched or applied in automotive and aerospace industries due to their outstanding impact absorbing performance in view of light weight aspect. Specially, the replacement of side-impact beam as the fiber reinforced plastic has been researched actively. The objective of this paper is the primitive investigation in the development of side-door impact beam using the fiber metal laminate. First, the three-point bending simulations were conducted to decide the shape of impact beam using the numerical analysis. Next, two cases impact beam (pure DP 980 and fiber metal laminate) were installed in the side-door, and then the bending tests (according to FMVSS 214S) were simulated using the numerical analysis. It is noted that the side-door impact beam can be replaced with the fiber metal laminate sufficiently based on the numerical analysis results.

Study on the Thermo-Mechanical Behaviors of Fiber Metal Laminates Using the Classical Lamination Theory (고전적층이론을 이용한 섬유금속적층판의 열 . 거동 연구)

  • Choi, Heung-Soap;Roh, Hee-Seok;Kang, Gil-Ho;Ha, Min-Su
    • Transactions of the Korean Society of Mechanical Engineers A
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    • v.28 no.4
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    • pp.394-401
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    • 2004
  • In this study the mechanical behaviors of fiber metal laminates(FMLs) such as ARALL, GLARE and CARE which are recently developed as new structural materials and known to have excellent fatigue resistant characteristics while with relatively low densities compared to the conventional aluminum materials, are considered through the classical lamination theory. The mechanical properties such as elastic moduli, thermal expansion coefficients and hygro-thermally induced residual stresses in the fiber metal laminates are obtained and compared each other. Also, carpet plots of effective elastic moduli, Poisson's ratio and the thermal expansion coefficient for GLARE FML are plotted.

Load Transfer Behaviors of the Splice-Jointed Fiber Metal Laminates (연결이음 접합된 섬유금속적층판의 하중전달 거동 연구)

  • Roh Hee Seok;Choi Won Jong;Ha Min Su;Choi Heung Soap
    • Transactions of the Korean Society of Mechanical Engineers A
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    • v.29 no.2
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    • pp.220-227
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    • 2005
  • In this study, stress-displacement analytic solutions are obtained by a shear lag modeling method constructed for the spliced joint area with a splicing gap in the fiber metal laminate (FML). This gap can be empty or be filled with an adhesive material of elastic modulus $E_a$. Two splicing types are considered for spliced shear models, one for spliced in the center metal layer, the other for spliced in the outer metal layer. It is shown that from the viewpoint of the load transfer efficiency and the avoidability of disbond generation due to the shear and axial stresses at the interface between metal layer and composite layer of the gap-front in the spliced area, the center spliced type (k=2) is much preferable to the outer spliced type (k=1).

Study on Enhancement for Interfacial Energy Release Rate of Adhesive Layer in Fiber Metal Laminates using Taguchi Method (다구찌 기법을 적용한 섬유금속적층판 접착층의 에너지 해방률 강화에 대한 연구)

  • Kil, Min-Gyu;Park, Eu-Tteum;Song, Woo-Jin;Kang, Beom-Soo
    • Composites Research
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    • v.29 no.5
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    • pp.249-255
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    • 2016
  • The fiber metal laminates have been widely used at aerospace industry due to outstanding fatigue characteristic, corrosion resistance and impact resistance and so forth. The objective of this research is to establish the proper manufacturing variables for enhancing the interfacial energy release rate of fiber metal laminates using Taguchi method. The major variables of the manufacturing process are surface treatment, pre-specified temperature holding time and additional pressure. In order to determine the interfacial adhesive strength, the double cantilever beam and end-notched flexure tests were conducted. Afterward, Mode I and II energy release rates at various conditions were introduced signal-to-noise ratio with respect to each condition. Finally, the most efficient manufacturing variables are recognized using larger-the-better characteristic.

Development of Low-Velocity Impact Analysis Model of Carbon-Steel Laminates through Finite Element Analysis (유한요소해석을 통한 탄소섬유-연강 적층판의 저속 충격 해석 모델 개발)

  • Park, Byung-Jin;Lee, Dong-Woo;Song, Jung-Il
    • Composites Research
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    • v.31 no.5
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    • pp.215-220
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    • 2018
  • In this study, finite element analysis of Carbon-Steel Laminates with different layup pattern was conducted to verify similarity to the results of previous studies and to develop the effective model for low-velocity impact analysis. As in the experiment, Finite element analysis of the Fiber metal laminates (FMLs) with five different lamination patterns was carried out, and the impact resistance of the FMLs was confirmed by comparing the energy absorption ratio. The FMLs showed the higher energy absorption ratio than the mild steel having the same thickness, and it was confirmed that all the FMLs had the high energy absorption ratio over than 96%. In addition, the low-velocity impact analysis model proposed in this study can be effectively used to study composite forms and automotive structures.

Thermal residual stress behavior in fiber metal laminates (섬유금속적층판의 경화 시 발생하는 열 잔류응력에 관한 연구)

  • Kim, Se-Young;Choi, Won-Jong;Park, Sang-Yoon;Moon, Cho-Rok
    • Journal of the Korean Society for Aeronautical & Space Sciences
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    • v.33 no.6
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    • pp.39-44
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    • 2005
  • Due to mismatch of thermal expansion coefficients between aluminum sheet and glass/epoxy sheet, thermal residual stresses generally appear in the FML. These stresses will affect the yield and fatigue strength of the FML. The numerically determined residual stresses in the Fiber-Metal-Laminates(FML) have been compared to the residual stresses measured from the curvature and tensile test methods. These two experimental methods have been developed for assessing the influence of residual stress in FML. Post-stretching process has been applied to remove the thermal residual stress and reverse the stress distribution. After post-stretching process, the residual stress has been measured from experiments. The results obtained show that analytical and experimental data are well agreed. The thermal residual stress can be removed by post-stretching process and it will increase the yield strength of FML.

Load Transfer Behaviors near the Spliced Joint of the Fiber Metal Laminates (섬유금속적층판 연결접합 부위의 하중전달 거동 연구)

  • Choi, Heung-Soap;Roh, Hee-Seok;Jang, Yong-Hoon
    • Proceedings of the KSME Conference
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    • pp.1388-1393
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    • 2003
  • In this study, analytic stress-displacement solutions are obtained by using a shear lag modeling constructed for the spliced joint area with a splicing gap filled with adhesive material of elastic modulus $E_{a}$ in the fiber metal laminate (FML) which is known to have excellent fatigue, corrosion and fire-flame resistant characteristics while with relatively low densities compared to the conventional aluminum alloys for lightweight structures.

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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.

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 and Experimental Investigation on Impact Performance of Fiber Metal Laminates Based on Thermoplastic Composites (열가소성 복합재료를 기반한 섬유금속적층판의 충격 거동에 관한 실험 및 수치적 연구)

  • Lee, Byoung-Eon;Kang, Dong-Sik;Park, Eu-Tteum;Kim, Jeong;Kang, Beom-Soo;Song, Woo-Jin
    • Transactions of the Korean Society of Automotive Engineers
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    • v.24 no.5
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    • pp.566-574
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    • 2016
  • Fiber metal laminates, which are hybrid materials consisting of metal sheets and composite layers, have contributed to aerospace and automotive industries due to their reduced weight and improved damage tolerance characteristics. In this study, the impact performance of the laminates, which are comprised of a self-reinforced polypropylene and two aluminum sheets, and the pure aluminum alloy sheet material were investigated experimentally via numerical simulation. In order to compare the impact performance, the laminates and aluminum alloy were examined by assessing the impact force, energy time histories, and specific energy absorption. ABAQUS is a commercial software that is used to simulate the actual drop-weight tests. Based on this study, it is noted that the impact performance of the laminates was superior to that of the aluminum alloy. In addition, a good agreement between the experimental and numerical results can be achieved when the impact force and energy time histories from the experiments and the numerical simulations are compared.