• Title/Summary/Keyword: 보강링

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Ultimate Behavior of GFRP Shell Structure Stiffened by Steel Pipe Ring (강관링으로 보강된 GFRP 쉘구조의 극한 거동)

  • Kim, In Gyu;Lim, Seung Hyun;Kim, Sung Bo
    • Journal of Korean Society of Steel Construction
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    • v.26 no.3
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    • pp.219-229
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    • 2014
  • The experiment and FE analysis of ultimate behavior of GFRP cylindrical shell structure stiffened by steel pipe ring instead of rectangular cross-section ring was presented. Four kinds of test models were designed and flexural failure experiment was performed to investigate ultimate behavior characteristic according to the size of cross section of steel pipe ring and diameter of GFRP shell. Material properties of specimens were experimented by bending, tensile and compressive test. Displacements and strains were measured to evaluate failure behavior of steel pipe ring and GFRP shell structure. The experimental results were compared with the FEA results by commercial program ABAQUS. It is observed that GFRP shell structure stiffened by steel ring have enough ductility to bending failure, and an increase of bending rigidity of steel ring is very effective to increase of failure strength of GFRP shell structure.

Flexural Behavior of Composite Ring Stiffened by GFRP and Steel Pipe (GFRP와 강관으로 구성된 합성형 보강링의 휨거동)

  • Yoon, A Reum;Kim, Su Eun;Kim, Sung Bo
    • Journal of Korean Society of Steel Construction
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    • v.29 no.1
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    • pp.61-71
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    • 2017
  • The flexural behavior of composite ring stiffened by GFRP and steel pipe is presented in this paper. The effective width is required to construct FEM beam element model to verify the composite flexural behavior of stiffened ring of cylindrical shell structure. The experimental results are compared with the theoretical and FEM results by commercial program ABAQUS to verify the effective width coefficient. The yield, crack and ultimate loads is calculated using theoretical strains that varies depending on yield state and compared with experiment result and FEM results by ABAQUS solid model.

Design of the Prestressed Cold Extrusion Die with Two Stress Rings (이중 보강링으로 예압된 냉간압출 금형 설계)

  • Heo, Gwan-Do;Yeo, Hong-Tae;Ye, Sang-Don
    • Journal of the Korean Society for Precision Engineering
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    • v.17 no.10
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    • pp.77-82
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    • 2000
  • The design of the prestressed cold extrusion die with two stress rings has been performed in this study. The cold extrusion has been simulated by the rigid-plastic FEM. The stress analysis of die has been performed for both after shrink fitting and during extrusion by using the elastic FEM and the Lame's equation. According to the variation of interferences and diameter ratios, the maximum effective stress has been evaluated. As results, interferences and diameters were determined by the minimization of the maximum effective stress of die insert. The comparison of the maximum effective stress between the proposed design and the conventional design has been discussed. It was found that the maximum effective stress in the die insert is considerably affected by the stiffness of the first stress ring.

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Elastic Finite Element Analysis of the Cold Forging Dies Prestressed by Shrinkage Rings (보강링에 의하여 예압된 냉간단조금형구조의 탄성유한요소 해석)

  • Seo, Dae-Yun;Lee, Min-Cheol;Jeon, Man-Su
    • Transactions of Materials Processing
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    • v.7 no.4
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    • pp.347-353
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    • 1998
  • A new approach of elastic finite element to die stress analysis in forging is presented in this paper. The die set analysis problem is formulated by considering contact problems under both mechanical and thermal loads. In the approach, amount of shrink fit is controlled by thermal load i.e., temperature difference between die insert and shrink fits. The loading conditions are extracted automatically from a forging simulator. The predicted solution is compared with analytical one and it has been shown that the predicted results are in excellent agreement with the analytical ones. An application example is given, which was found in a cold forging company.

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Integrated Analysis for the Shrink-Fitted Die with Multi stress-Ring of Dissimilar Materials (열박음된 이종재 다중보강링을 갖는 금형의 통합해석)

  • Yoh, Eun-Gu;Lee, Yong-Shin
    • Journal of the Korean Society for Precision Engineering
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    • v.18 no.3
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    • pp.40-46
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    • 2001
  • An integrated analysis for the thermo-elastic deformation, fatigue, wear and brittle damage evolution of the shrink-fitted die with multi stress-ring of dissimilar materials is presented. A simple numerical algorithm for the moving elastic boundaries characterizing the contacts of the insert and multi stress-rings is presented. The initial stress distribution in the die due to shrink-fit is considered and the traction at the die surface contacting with the work piece is obtained by analyzing the elasto-plastic deformation of work piece. Elastic analysis of the separate-type die is performed and then the evolution of brittle damage, wear and fatigue life are predicted. This integrated analysis is applied to the extrusion die with two layers of stress-rings and the results are discussed in detail.

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The Effect of Stress Ring for the Design of Precision Cold Forging Die (정밀 냉간단조 금형설계를 위한 보강링의 영향)

  • Hur, Kwan-Do;Choi, Young;Yeo, Hong-Tae
    • Journal of the Korean Society for Precision Engineering
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    • v.18 no.12
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    • pp.145-151
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    • 2001
  • The dimensional accuracy of the cold forged part is depended on the elastic characteristics of the die. To increase the stiffness of the prestressed die, the first stress ring of the tungsten carbide alloy (WC) is considered. For the design, Lame's equation is used. Diameter ratios and interferences have been determinated by maximum inner pressure without yielding of materials. The design of the prestressed die has been compared with the conventional one. For the comparison, the FE-analysis using ANSYS has been performed. The results indicate that the prestressed die with the high stiffness can be obtained by the using the high stiffness material as the first stress ring.

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Optimal Design of Dimension of Extrusion Die with Multi Stress Rings (다중보강링을 갖는 압출금형의 치수최적설계)

  • An, Sung-Chan;Im, Yong-Taek
    • Transactions of the Korean Society of Mechanical Engineers A
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    • v.26 no.10
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    • pp.2211-2218
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    • 2002
  • In this study, an optimal design study has been made to determine dimensions of die and multi stress rings for extrusion process. For this purpose, a thermo-rigid-viscoplastic finite element program, CAMPform, was used fur forming analysis of extrusion process and a developed elastic finite element program fur elastic stress analysis of the die set including stress rings. And an optimization program, DOT, was employed for the optimization analysis. From this investigation, it was found out that the amount of shrink fitting incurred by the order of assembly of the die set should be taken into account for optimization when the multi stress rings are used in practice. In addition, it is construed that the proposed design method can be beneficial fur improving the tool life of cold extrusion die set.

Design of High Strength Underground FRP Septic Tank Stiffened by Circular Steel Pipe (원형강관으로 보강된 지중매립형 FRP 개인하수 처리시설의 설계)

  • Cho, Kwang Je;Kim, Sung Bo
    • KSCE Journal of Civil and Environmental Engineering Research
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    • v.32 no.3A
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    • pp.171-181
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    • 2012
  • The design of high strength underground septic tank stiffened by steel pipe is presented and the ultimate behavior is investigated according to the full scale experiments for three types of specimens. The limitation of the current design specification are pointed out and the general design procedure of private sewage treatment facility are newly developed considering thickness of FRP shell, types of steel pipe stiffer and diaphragm wall. The direct tensile and bending test for FRP material of septic tank were performed. The increase effect of ultimate strength due to the circular steel pipe are investigated by the full scale field test and compared with the results by the finite element analysis.

Optimum Design of one Stress-Ring Die for Powder Compaction (분말압축성형용 단일보강링 금형의 최적설계)

  • Sin, Jung-Ho;Son, Ju-Ri
    • 한국기계연구소 소보
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    • s.17
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    • pp.75-82
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    • 1987
  • Shrink-rings (Stress-rings) are used in the fabrication of powder compaction dies to increase the allowable compaction pressures for a given die material. Optimum Procedures are used to insure that the stress distributions in the die and stress-rings ultilize fully the strength available in each of the die elements. Two criteria for the optimum die design are used: Maximum shear stress limit for one-piece dies and zero tensile stress limit for combined dies. Examples for each case are presented in this paper.

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