• Title, Summary, Keyword: circular deformation

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The effect of compressive strain rate on biaxial compressive deformation characteristics of Al circular pipe (AI 원형 관의 2축 압축 변형특성에 미치는 압축속도의 영향)

  • Won, S.T.;Jung, H.J.;Ahn, H.J.;Cho, H.H.;Yoo, C.K.
    • 한국금형공학회:학술대회논문집
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    • pp.23-26
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    • 2008
  • In order to examine the deformation characteristics of Al circular pipe underthe biaxial compression, the horizontal biaxial compression die for the experiment was manufactured. From this, in the various compressive strain rate (1 mm/min. ${\sim}$ 400 mm/min.)conditions, the circular pipes, which were made by Al materials, were investigated based on the properties change of cross section area, punch load and deformation behavior. The tensile and compressive strains were evaluated from micro Vickers hardness tester. From these results, the punch load and deformation characteristic of Al circular pipes were highly changed in the compressive strain rate about 200 mm/min. The Al circular pipes had the tendency that the punch load decreased with increasing the compressive strain rate. In addition, following as the change of the shape and position of neutral axis due to the deformation proceeding of the circular pipe, the special point of the internal circular pipe at maximum load showed the maximum deformation strain and the maximum measured hardness value. The CAE (computer aided engineering) simulation using Deform-2D program was performed on the circular pipe in order to know and verify the exact compressive deformation behavior. From these results, the experimentally measured results were reasonably in good agreement with the simulation results.

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An Analytical Study on the Deformation Behavior of the Reinforced Concrete Circular Section Column under Bi-Axial Bending Moment and Axial Force (2축휨가 축력을 받는 철근콘크리트 원형단면주의 변형성상에 관한 해석적연구)

  • 정호길
    • Proceedings of the Earthquake Engineering Society of Korea Conference
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    • pp.163-172
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    • 1997
  • This paper is a study on the deformation behavior of the reinforced concrete circular section column carrying bi-axial bending moment and axial force. That is, this is to clarify the deformation behavior of the reinforced concrete circular section column carrying bi-axial bending moment and axial force by analytic methods. The deformation behavior of circular section column under bi-axial uni-axial bending moment and axial force are compare with those of a square section column under the same conditions. Those of circular section column under bi-axial bending moment are decreased as compared with those of circular section column under uni-axial bending moment. The results mentioned above are the same under the axial force of 7tons and 11tons.

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The influence of joints on compressive strength and deformation behavior of rock with a circular hole. (원형공을 갖는 암석의 압축강도 및 변형거동에 미치는 절리의 영향)

  • 조의권;김일중;김기주;김영석
    • Tunnel and Underground Space
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    • v.7 no.2
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    • pp.108-115
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    • 1997
  • Uniaxial and biaxial compressive tests were conducted on limestone specimens containing artificial joints and a circular hole to investigate the influence of inclination and number of joints on compressive strength and deformation behavior of rock with a circular hole. Under uniaxial and biaxial compressive condition, the inclination of joints showing the maximum and minimum strength were 0$^{\circ}$ and 30$^{\circ}$ respectively, which was independent of the number of joints. Under uniaxial compressive condition, relative maximum strength of rock with n=1 and 3 to intact rock with a circular hole were 12.5%~82.8% and 11.4~62.5% respectively, and under biaxial compressive condition, 18.2~91.0% and 17.0~87.5% respectively. The influence of the number of joints on the decrease of compressive strength was greater under uniaxial than under biaxial compressive condition. Under uniaxial and biaxial compressive condition, axial and lateral deformations of rock showed the least values where $\alpha$=30$^{\circ}$. Under uniaxial compressive condition, axial and lateral deformation at maximum strength of rock have the increasing tendency with increase the number of joints. But they have the decreasing tendency under biaxial compressive condition. Under uniaxial and biaxial compressive conditions, axial deformation of circular hole was greater than lateral deformation without respect to the number of joints and the inclination of joints.

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Free Vibrations of Tapered Circular Arches Considering Rotatory Inertia. Shear Deformation and Axial Deformation (회전관성, 전단변형 및 축변형을 고려한 변단면 원호아치의 자유진동)

  • 오상진;모정만
    • Proceedings of the Korean Society for Noise and Vibration Engineering Conference
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    • pp.1254-1259
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    • 2001
  • This paper deals with the free vibrations of circular arches with variable cross-section. The differential equations governing free, in-plane vibrations of tapered circular arches, including the effects of rotatory inertia, shear deformation and axial deformation, are derived and solved numerically to obtain frequencies and mode shapes. Numerical results are calculated for the quadratic arches with hinged-hinged and clamped-clamped end constraints. Three general taper types for a rectangular section are considered. The lowest four natural frequencies and mode shapes are presented over a range of non-dimensional system parameters: the subtended angle, the slenderness ratio and the section ratio.

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A Study on the Sheet Metal Forming and the Plastic Deformation Characteristic by Using PAM-STAMP (PAM-STAMP를 이용한 박판성형성 및 소성변형 특성에 관한 연구)

  • Kang, Dae-Min
    • Journal of Ocean Engineering and Technology
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    • v.13 no.1
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    • pp.29-38
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    • 1999
  • In this paper the forming simulation of circular bulge by using PAM-STAMP has been performed to estimate the sheet metal forning and the plastic deformation characteristic of circular bulge. The uniaxial tension tests adn bulge tests are carried out for studying the forming characteristics of materials, and also Moire experiment are carried out for measuring the radius of curvature of the bulge and the polar compressive thickness strain. In order to compare the simulation results with the experiment and Hills theory, the relationships between redius of curvature adn polar height of the bulge, between hydraulic pressure and polar height, and between polar compressive thickness strain and polar height, are used. According to this study, the results of simulation and Hills theory are good agreement to the experiment. So, the results of simulation by using PAM-STAMP and Hills theory will give engineers good information to assess the formagbility and plastic deformation characteristic of hydraulic circular bulge test.

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Free Vibrations of Shear Deformable Circular Arches with Rotationally Flexible Supports (전단변형을 고려한 회전 가능한 지점을 갖는 원호 아치의 자유진동)

  • Oh, Sang-Jin;Yoon, Hee-Min;Park, Kwang-Kyou
    • Proceedings of the Korean Society for Noise and Vibration Engineering Conference
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    • pp.1181-1184
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    • 2007
  • The differential equations governing free, in-plane vibrations of linearly elastic circular arches with rotationally flexible supports, including the effects of rotatory inertia, shear deformation and axial deformation, are solved numerically using the corresponding boundary conditions. The lowest four natural frequencies and the corresponding mode shapes are obtained over a range of non-dimensional system parameters: the subtended angle, the slenderness ratio, and the rotational spring stiffness.

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Free Vibrations of Non-Circular Arches with Elastic Supports (탄성지점을 갖는 변화곡률 아치의 자유진동)

  • Oh, Sang-Jin;Kim, Gwon-Sik;Park, Kwang-Kyou
    • Proceedings of the Korean Society for Noise and Vibration Engineering Conference
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    • pp.340-343
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    • 2007
  • The differential equations governing free, in-plane vibrations of non-circular arches with the translational (radial and tangential directions) and rotational springs at the ends, including the effects of rotatory inertia, shear deformation and axial deformation, are solved numerically using the corresponding boundary conditions. The lowest four natural frequencies for the parabolic geometry are calculated over a range of non-dimensional system parameters: the arch rise to span length ratio, the slenderness ratio, and the translational and rotational spring parameters.

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Free Vibrations of Stepped Circular Arcs (불연속 변단면을 갖는 원호 곡선부재의 자유진동)

  • 오상진;진태기;최규문;이종국
    • Proceedings of the Korean Society for Noise and Vibration Engineering Conference
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    • pp.429-434
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    • 2002
  • The differential equations governing in-plane free vibrations of stepped circular arcs, including the effects of axial deformation, rotatory inertia and shear deformation, are derived and solved numerically to obtain frequencies and mode shapes. Numerical results are calculated for the clamped-clamped symmetric and unsymmetric circular arcs with thickness varying in a discontinuous fashion. The lowest four natural frequencies and mode shapes are presented over a range of non-dimensional system parameters: the subtended angle, the slenderness ratio, the section ratio and the ratio of discontinuous section.

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A Study on the Evaluation of the Flexibility of Joint Area including Circular Section (원형단면을 포함하는 결합부의 강성평가 방법 연구)

  • 국종영;박상준
    • Transactions of the Korean Society of Automotive Engineers
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    • v.8 no.2
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    • pp.110-119
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    • 2000
  • In this study, we considered the method evaluation the flexibility of joint area including member with circular section. We regarded the flexibility of joint area as translational and rotational springs for the purpose of expressing local deformation. We verified this method by the use of normal mode analysis. We also calculated this joint area occurring in penetration so as to apply this method to other cases. Compare with the shell element model. we can the considerably approximate values.

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Experimental study on circular CFST short columns with intermittently welded stiffeners

  • Thomas, Job;Sandeep, T.N.
    • Steel and Composite Structures
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    • v.29 no.5
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    • pp.659-667
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    • 2018
  • This paper deals with the experimental study on strength the strength and deformation characteristics of short circular Concrete Filled Steel Tube (CFST) columns. Effect of vertical stiffeners on the behavior of the column is studied under axial compressive loading. Intermittently welded vertical stiffeners are used to strengthen the tubes. Stiffeners are attached to the inner surface of tube by welding through pre drilled holes on the tube. The variable of the study is the spacing of the weld between stiffeners and circular tube. A total of 5 specimens with different weld spacing (60 mm, 75 mm, 100 mm, 150 mm and 350 mm) were prepared and tested. Short CFST columns of height 350 mm, outer tube diameter of 165 mm and thickness of 4.5 mm were used in the study. Concrete of cube compressive strength $41N/mm^2$ and steel tubes with yield strength $310N/mm^2$ are adopted. The test results indicate that the strength and deformation of the circular CFST column is found to be significantly influenced by the weld spacing. The ultimate axial load carrying capacity was found to increase by 11% when the spacing of weld is reduced from 350 mm to 60 mm. The vertical stiffeners are found to effective in enhancing the initial stiffness and ductility of CFST columns. The prediction models were developed for strength and deformation of CFST columns. The prediction is found to be in good agreement with the corresponding test data.