Crack modeling in FE analysis of circular tubular joints

Cao, Jian; Yang, Guoping; Packer, Jeffrey A.; Burdekin, F.M.

doi:10.1016/s0013-7944(98)00091-5

Cited by 48 publications

(39 citation statements)

References 6 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%

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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%

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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“…There are so many references [9][10][11][12][13][14][15] which the problem is modeled by finite element method. Due to a great scattering in the experimental results [15][16][17][18], direct comparison of numerical and experimental results does not add conclusive criteria about the validity of the numerical results [8].…”

Section: Introductionmentioning

confidence: 99%

“…Thereupon Fleck [9] worked on the plane strain case, then Chermahini [9][10][11][12][13][14][15][16][17][18][19][20] continued this line of research with the three-dimensional models. Then McClung and Sehitoglu [21][22][23][24][25][26][27] investigated the influence of various parameters and different aspects such as the study of the plastic zone size.…”

Section: Introductionmentioning

confidence: 99%

Investigation of Mesh Sensitivity Influence to Determine Crack Characteristic by Finite Element Methods

Azimi

Mirjavadi

Asli

2016

J Fail. Anal. and Preven.

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In this research, an extended finite element model has been investigated. Investigation of opening and closure stress always has been one of the difficult parameters to analysis of results; therefore, the utilization of finite element methods would be a good and logical alternative for this purpose. In addition, linear elastic fracture criteria are used for validation of numerical results from the simulation. In this work, a detailed analysis of the influence of different parameters in the results of a specific specimen with a semi-elliptical tooling groove in terms of closure and opening stress is presented, and the impact of optimum element size in fracture characteristic in various load cycles has been discussed.

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“…Hence, in order to carry out an accurate SCF or fatigue analysis for TWS joints, a number of researchers have resolved to some tailor-made mesh generation procedures [24,25]. In practice, in order to optimize the cost effectiveness of the FE analysis, it is desired that refined elements with suitable size grading (in both surface and thickness directions) should be employed near the intersection while single layer of relatively large elements (in the surface direction) should be used at regions far away from the intersection.…”

Section: Introductionmentioning

confidence: 99%

A new automatic adaptive 3D solid mesh generation scheme for thin-walled structures

Lee¹,

Xu²

2005

Int. J. Numer. Meth. Engng

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SUMMARYA new algorithm to generate three-dimensional (3D) mesh for thin-walled structures is proposed. In the proposed algorithm, the mesh generation procedure is divided into two distinct phases. In the first phase, a surface mesh generator is employed to generate a surface mesh for the mid-surface of the thin-walled structure. The surface mesh generator used will control the element size properties of the final mesh along the surface direction. In the second phase, specially designed algorithms are used to convert the surface mesh to a 3D solid mesh by extrusion in the surface normal direction of the surface. The extrusion procedure will control the refinement levels of the final mesh along the surface normal direction. If the input surface mesh is a pure quadrilateral mesh and refinement level in the surface normal direction is uniform along the whole surface, all hex-meshes will be produced. Otherwise, the final 3D meshes generated will eventually consist of four types of solid elements, namely, tetrahedron, prism, pyramid and hexahedron. The presented algorithm is highly flexible in the sense that, in the first phase, any existing surface mesh generator can be employed while in the second phase, the extrusion procedure can accept either a triangular or a quadrilateral or even a mixed mesh as input and there is virtually no constraint on the grading of the input mesh. In addition, the extrusion procedure development is able to handle structural joints formed by the intersections of different surfaces. Numerical experiments indicate that the present algorithm is applicable to most practical situations and well-shaped elements are generated.

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Crack modeling in FE analysis of circular tubular joints

Cited by 48 publications

References 6 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

Investigation of Mesh Sensitivity Influence to Determine Crack Characteristic by Finite Element Methods

A new automatic adaptive 3D solid mesh generation scheme for thin-walled structures

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