Model and mesh generation of cracked tubular Y-joints

Lie, S.T.; Lee, Chi King; Wong, Sai‐Wai

doi:10.1016/s0013-7944(02)00036-x

Cited by 31 publications

(34 citation statements)

References 16 publications

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“…By examining previous research works (Huang and Hancock [5], Rhee [6], Bowness and Lee [7,8], Cao et al [9], Lie et al [10], Chiew et al [11]), it is found that all nodes at two ends of the chord are generally fixed in FE analysis. This type of boundary condition is reasonable as both ends of the chord are connected with adjacent members in practice.…”

Section: Boundary Conditionsmentioning

confidence: 91%

“…For the past decades, many researchers had developed their special purpose automatic FE mesh generators (Huang and Hancock [5], Rhee [6], Bowness and Lee [7,8], Cao et al [9], Lie et al [10], Chiew et al [11]) as it is a daunting task to manually create the mesh models of the 3D surface crack in any CHS joint. Among of these researchers, Bowness and Lee [7,8], Lie et al [10] and Chiew et al [11] had carried out extensive analyses on the SIFs of CHS T/Y-joints taking advantage of their own mesh generators.…”

Section: Introductionmentioning

confidence: 99%

“…Among of these researchers, Bowness and Lee [7,8], Lie et al [10] and Chiew et al [11] had carried out extensive analyses on the SIFs of CHS T/Y-joints taking advantage of their own mesh generators. However, due to the limitations of their mesh generators, all the works done so far focus only on cracked CHS T-joints subjected to axial loading, and there are no published reports on SIFs of cracked CHS T/Y-joints subjected to in-plane bending and out-of-plane bending.…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Stress Intensity Factors of Tubular T/Y-Joints Subjected to Three Basic Loading

Lie¹,

Li²,

Shao³

2016

Volume 12 Number 2

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This paper describes the determination of stress intensity factors (SIFs) of a 3D surface crack in a circular hollow section (CHS) T/Y-joint subjected to three basic loading. In order to achieve the main objective, an automatic finite element (FE) mesh generator is designed whereby the mesh density and element type of the Crack Tube zone can be controlled by the users. Extensive tests are carried out to check the accuracy and to test the convergence of the mesh models. It is found that the generated mesh models are both accurate and robust. Subsequently, a total of 246 cracked CHS T/Y-joints subjected to axial loading; in-plane bending and out-of-plane bending are analysed, and the influencing parameters β, γ, τ, θ, a/t0 and c/a on the SIFs of a 3D surface crack are investigated in this study. The SIFs at the deepest point of a 3D surface crack are also determined using an indirect method incorporated in BS7910. It is found that the later underestimates the SIFs by as much as -36.9% under axial load for crack located at the crown and -32.9% under out-of-plane bending for crack located at the saddle, respectively. Hence, the indirect method is found to be unsafe in estimating the SIFs of a 3D surface crack in CHS T/Y-joints under certain loading conditions and crack location.

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Section: Boundary Conditionsmentioning

confidence: 91%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Stress Intensity Factors of Tubular T/Y-Joints Subjected to Three Basic Loading

Lie¹,

Li²,

Shao³

2016

Volume 12 Number 2

Self Cite

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“…From full scale test results on the T, Y and K-joints (Lie et al, 2003, Chiew et al 2004, Lie et al2005b, it is known that the crack front shape resembles a semi-ellipse on a normalized ' ' v -u plane. Hence, the crack front equation is first defined on a normalized space and then map onto the crack surface ( Figure 10, Lee et al 2005).…”

Section: The Ntu Crack Modelmentioning

confidence: 99%

Advanced Numerical Modeling of Cracked Tubular K Joints: BEM and FEM Comparison

et al. 2012

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“…Based on the elastic-perfectly plastic model and the Von Mises yield criterion, a finite element model for analysis of welded hollow spherical joints subject to planar tri-directional loading of axial force or planar tri-directional combined loading of axial force and bending moment was established, the results showed that shows that load carrying capacity of welded hollow spherical joints mainly depends on the diameter ratio of steel tube and joint, the joint thickness and the load ratio [6]. Analytical and experimental researches on structural behavior of the intersecting joints were also performed during the past several decades and the design criterion were also proposed [7][8][9][10][11][12]. Whilst the WHSJ connected with rectangular hollow section members has been extensively applied in the practical engineering, few studies have explored the structural behavior of joint under load (axial force, bending moment, and the combination of the two, etc), and the practical design methods have received even less attention.…”

Section: Introductionmentioning

confidence: 99%

Load-Carrying Capacity and Practical Design Method of Welded Hollow Spherical Joints in Space Latticed Structures

Li¹

2010

Volume 6 Number 4

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A newly developed space structure, the polyhedron space frame based on the bubble theory, is adopted in Chinese National Swimming Center-the Water Cube for 2008 Beijing 29 th Olympic Games. Circular hollow sections, square hollow sections and rectangular hollow sections are employed as structural members, while welded hollow spherical joints are employed to connect the members. However, for welded hollow spherical joints connected with rectangular/square steel tubes, no previous study has been reported and no design criterion has been established. This paper investigates the structural behavior and load-carrying capacity of the joints subject to axial forces, bending moments and combined loading of the two. Based on the elastic-perfectly plastic model and the Von-Mises yield criterion, a finite element model for the analysis of the joints is established, in which the effect of geometric nonlinearity is taken into account. A major parametric study is then carried out employing this model. Experiments on ten typical full-scale joints are conducted to understand directly the structural behavior and the collapse mechanism of the joint, and also to validate the finite element model. A simplified theoretical solution is also derived for the loading-carrying capacity of the joint based on the punching shear failure model, and the basic form for the design equation is obtained. Finally, by utilizing the results from the simplified theoretical solution, finite element analysis and experimental study, the practical design method is established for the load-carrying capacity of the joints subject to axial forces, bending moments and the combined loading. The results from this study can be applied for direct design use, and also provide a reference for the revision of relevant design codes

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Model and mesh generation of cracked tubular Y-joints

Cited by 31 publications

References 16 publications

Stress Intensity Factors of Tubular T/Y-Joints Subjected to Three Basic Loading

Stress Intensity Factors of Tubular T/Y-Joints Subjected to Three Basic Loading

Advanced Numerical Modeling of Cracked Tubular K Joints: BEM and FEM Comparison

Load-Carrying Capacity and Practical Design Method of Welded Hollow Spherical Joints in Space Latticed Structures

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