• Title/Summary/Keyword: T-Joint

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Health Problem and Joint Bleeding, Limitation according to Severity in Patients with Hemophilia (혈우병 환자의 중증도에 따른 건강문제와 관절출혈 및 장애)

  • Kang, Hyun-Sook;Kim, Won-Ok;Song, Young-A
    • Journal of muscle and joint health
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    • v.11 no.2
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    • pp.119-126
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    • 2004
  • Purpose: The purpose of this study was to identify health problem and joint bleeding, disability according to severity in patients with hemophilia. Method: The research design was survey study for conformed severity in patients with hemophilia, health problem and bleeding of joint and degree of limitation. The subjects were 186 men in patients with hemophilia by convenience sampling. These results were analyzed statistically by frequency, percentage, t-test, chi-square. Result: 1. Health problem of severe hemophilia patients were significantly higher than moderate group(t=3.17, p=.002). A severe hemophilia patients were significantly higher than moderate group in health problem of socio-psychological, emotional, physical, interpersonal. 2. There was relation between severity and the frequency of bleeding($X^{2}=7.642$, p=.054). 3. A severe hemophilia patients were more than moderate group in disability of ankle joint(t=2.52, p=.013). Conclusion: A severe hemophilia patients has more severe problems than moderate patient in case of health problem, joint bleeding and degree of disability.

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An Experimental Study on the Mechanical Properties of T-Joints Structure using CFRP/Al Honeycomb Sandwich Composite (CFRP/Al하니콤 샌드위치 복합재 T-Joint 구조물의 기계적 물성에 대한 실험적 연구)

  • Cho, Ki-Dae;Ha, Sung-Rok;Kang, Kwang-Hee;Kim, Jie-Eok;Yang, Sung-Chul
    • Journal of the Korean Society for Precision Engineering
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    • v.29 no.3
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    • pp.313-318
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    • 2012
  • Application of composite structures on naval ships strongly depends on the mechanical strength and collapse behavior of the T-joints of the whole structure. Because of the weight advantages over single skin composite and bolt fastening joining, three types of T-joints using both honeycomb sandwich composite and adhesive bonding were suggested to determine the effect of T-joint configuration. It was found that joining with a urethane foam block and overlaminates using the secondary co-bonding technique improves T-joint strength.

Ductility analysis of bolted extended end plate beam-to-column connections in the framework of the component method

  • Girao Coelho, Ana M.;Simoes da Silva, Luis;Bijlaard, Frans S.K.
    • Steel and Composite Structures
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    • v.6 no.1
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    • pp.33-53
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    • 2006
  • The rotational behaviour of bolted extended end plate beam-to-column connections is evaluated in the context of the component method. The full moment-rotation response is characterized from the force-deformation curve of the individual joint components. The deformability of end plate connections is mostly governed by the bending of the column flange and/or end plate and tension elongation of the bolts. These components form the tension zone of the joint that can be modelled by means of "equivalent T-stubs". A systematic analytical procedure for characterization of the monotonic force-deformation behaviour of individual T-stub connections is proposed. In the framework of the component method, the T-stub is then inserted in the joint spring model to generate the moment-rotation response of the joint. The procedures are validated with the results from an experimental investigation of eight statically loaded extended end plate bolted moment connections carried out at the Delft University of Technology. Because ductility is such an important property in terms of joint performance, particularly in the partial strength joint scenario, special attention is given to this issue.

Influence of Talocrural Joint Mobilization on Balance and Proprioception of Adults with Limited Ankle Joint Dorsiflexion

  • An, Ho Jung;Kim, Ji Sung;Choi, Jung Hyun
    • Journal of International Academy of Physical Therapy Research
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    • v.9 no.4
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    • pp.1651-1656
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    • 2018
  • The purpose of this study was to assess the changes in balance and proprioception of adults with limited ankle joint dorsiflexion, after the application of talocrural joint mobilization. The subjects of this study included 23 college students in their twenties with limited ankle joint dorsiflexion. The students were randomly assigned to the ankle joint mobilization group (AJMG, n=12) and the control group (CG, n=11). After 2 weeks of intervention using grade III talocrural joint mobilization in the anterior-posterior movement, the balance and proprioception of the subjects were assessed. Static/dynamic balance capabilities and ankle proprioception were analyzed using paired t-test and independent t-test. The dynamic balance and proprioception of AJMG were significantly improved after intervention (p<.05), In the comparison between the groups after the intervention, the dynamic balance and proprioceptive sense of AJMG were significantly improved compared to the control group (p<.05). This study suggests that AJMG can help improve the dynamic balance and proprioception.

Ultimate Strength of branch-rotated T-joints in Cold-formed Square Hollow Sections - Chord flange failure mode - (지관이 회전된 냉간성형 각형강관 T형 접합부의 최대내력(I) - 주관 플랜지 파괴모드 -)

  • Bae, Kyu Woong;Park, Keum Sung;Kang, Chang Hoon;Moon, Tae Sup
    • Journal of Korean Society of Steel Construction
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    • v.14 no.5 s.60
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    • pp.657-664
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    • 2002
  • This paper described the ultimate strength and deformation limit of the new uniplanar T-joints in cold-formed square hollow sections. In the configuration of the new T-joint, only a branch member is orientated to a chord member at 45 degrees in the plane of the truss. This study focused on the branch-rotated T-joints that were governed by chord flange failure in previous studies. Test results of the T-joint in cold-formed square hollow sections revealed a deformation limit of 3%B for $16.7{\leq}2{\gamma}(=B/T){\leq}33.3$ and $0.27{\leq}{\beta}(=b1/B){\leq}0.6$. The existing strength formulae for traditional T-joint were determined and a new yield-line model for the branch-rotated T-joint proposed. Finally, the strength formula on the yield-line analysis was compared with test results and the application range of the proposed formula recommended.

An Experimental Study on Lap Joint using FSW with $2mm^t$ Aluminum Alloy Plate ($2mm^t$ 알루미늄합금재의 겹치기이음을 위한 마찰교반용접의 실험적 연구)

  • 장석기
    • Journal of Advanced Marine Engineering and Technology
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    • v.27 no.6
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    • pp.728-735
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    • 2003
  • This paper shows the possibility of performing Lap joint using the friction stir welding with $2mm^t$ aluminum alloy plate and the determination of tool-dimensions for FSW in milling machine. This research also is reported on obtaining the tensile-shear strength, 91.3 (MPa) and the energy absorption, 26.3 (J) for Lap jointed specimen. The optimal tool-dimensions and method for Lap joint using FSW is as follows; each diameter of shoulder and pin is $9\phi(mm) and 3\phi(mm)$, the length of pin is 3.6(mm), Pressing the shoulder of tool into original base metal is not reasonable.

Development of Optimum Design Technique for Bus Window Pillar Member (버스 윈도우 필라 부재의 형상 최적 설계기술 개발)

  • 김명한;김대성;임석현;서명원;배동호
    • Transactions of the Korean Society of Automotive Engineers
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    • v.7 no.6
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    • pp.156-164
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    • 1999
  • The body structure of a bus is generally assembled by using various spot welded box sectional members. The shape of window pillar joint is ordinarily built up by T-type member. It has been shown that T-type member has problems like high stress concentrations, low fatigue strength and low structural rigidity. In this study, to solve these problems a new approach to optimize the design of the bus window pillar joint was tried by FEM analysis and experiments. To describe the shape of the gusset connecting the vertical and horizontal members of the T-type window pillar joint B-spline curve was adopted and this curve was optimized . It was found that the new model developed could effectively improve fatigue durability an structural rigidity.

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A Study on the Production Mechanisms of Residual Stress in Welded T-joint of Steel Pipe Member (T형 강관 용접 이음부의 잔류응력 생성기구에 관한 연구)

  • 장경호;장갑철;경장현;이은택
    • Journal of Welding and Joining
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    • v.21 no.6
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    • pp.40-45
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    • 2003
  • Steel members have advantages of resisting torsion and axial compression. In design, residual stresses at the welded joint of T-shape steel pipes are one of the most important points to be considered. In this paper, characteristics of residual stresses of welded joints are clarified by carrying out 3D non-steady heat conduction analysis and 3D thermal elastic-plastic FE-analysis. According to the results, the production mechanism of residual stresses at the welded joint of T-shape steel pipe is clarified. In this paper, circumferential stresses depended on thermal histories but axial and radial stresses were more dependent on geometrical shape than thermal histories. Residual stresses in the axial direction on the lower part of pipe member were tensile, controlled by geometrical shape. However, in case of middle part, residual stresses in all the directions were controlled by thermal histories.

Development of dynamic behavior of the novel composite T-joints: Numerical and experimental

  • Mokhtari, Madjid;Shahravi, Morteza;Zabihpoor, Mahmood
    • Advances in aircraft and spacecraft science
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    • v.5 no.3
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    • pp.385-400
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    • 2018
  • In this paper dynamic behavior (modal analysis and dynamic transient response) of a novel sandwich T-joint is numerically and experimentally investigated. An epoxy adhesive is selected for bonding purpose and making the step wise graded behavior of adhesive region. The effect of the step graded behavior of the adhesive zone on dynamic behavior of a sandwich T-joint is numerically studied. Finite element analysis (FEA) of the T-joints with carbon fiber reinforced polymer (CFRP) face-sheets is performed by ABAQUS 6.12-1 FEM code software. Modal analysis and dynamic half-sine transient response of the sandwich T-joint are presented in this paper. Two verification processes employed to verify the dynamic modeling of the manufactured sandwich panels and T-joint modeling. It has been shown that the step wise graded adhesive zone cases have changed the second natural frequency by about 5%. Also, it has been shown that the different arranges in the step wise graded adhesive zone significantly affect the maximum stresses due to transient dynamic loading by 1112% decrease in maximum peel stress and 691.9% decrease in maximum shear stress on the adhesive region.

Analysis for Strength Estimation of Adhesive Joints (접착이음의 강도평가에 대한 해석)

  • Park Sung-Oan
    • Transactions of the Korean Society of Machine Tool Engineers
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    • v.14 no.5
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    • pp.62-73
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    • 2005
  • The objects of this research are to establish the criteria of peel occurrence considering the shape of bond terminus and to compare the strength properties of adhesive joint of different three type such as butt joint, T-shape, and single lap Joints. The criteria of peel occurrence at the bond terminus was suggested. Peel loads of three type adhesive joint (butt Joint, T-shape specimen, single lap joint) were determined from tensile tests. Principal stress distributions of these joints were determined from finite element method analysis. Then, peel occurrence was estimated with stress singularity factor$(K_{prin})$ when the terminus shape was square, with average principal stress when the terminus shape was rounded. The conclusions are summarized as follows; (1) In the non-filleted model(e.g., butt joint, T-shape specimen), principal stress shows singularity at the bond terminus, intensity of stress(principal stress) singularity $(K_{prin})$ can use as the criteria of peel occurrence at the bond terminus. (2) In the filleted model(e.g., single lap joint), principal stress has not affected singularity at the bond terminus. Average principal stress$(K_{av})$ can use as the criteria of peel occurrence at the bond terminus.