Finite element-based limit load of piping branch junctions under combined loadings

Xuan, Fu‐Zhen; Li, Peining

doi:10.1016/j.nucengdes.2004.03.007

Cited by 19 publications

(10 citation statements)

References 15 publications

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“…The effects of geometry, crack size and location, the mismatch ratio of weld and base metal on the EISSC and modified TDFAD are included by the limit load calculation of welded structures. Such a limit load can be evaluated from simplified solutions 19,20 or from finite‐element analysis 21,22 . As long as the limit load solutions of welded structures with cracks at different locations in the weld are available, the time‐dependent FADs can be constructed and used in a straightforward manner following the above procedure.…”

Section: Discussionmentioning

confidence: 99%

A modified time‐dependent failure assessment diagram for cracks in mismatched welds at high temperatures

Xuan

Wang

2006

Fatigue Fract Eng Mat Struct

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A B S T R A C T In this work, the case of cracks located in a weld with mismatched creep properties from that of the surrounding base material is addressed. A weighted-average method for both over-and undermatched creep performance of the weld and base materials is presented, and an equivalent isochronous stress-strain curve (EISSC) is then defined. Accordingly, a time-dependent failure assessment curve is constructed using the method of R6 Option 2. This curve now depends not only on the mechanical properties of both weld and base materials but also on the weld geometry and crack size. The application of such an approach to an internal, circumferentially defected welded cylinder under axial tension has been studied. Results indicate that the dependence of the modified time-dependent failure assessment curves (TDFACs) on the geometry, crack size and service time is not significant and nearly collapses into one curve. The general failure assessment curve from isochronous data of austenitic steel, proposed by Ainsworth, is non-conservative for some cases and thus may not be applicable for Cr-Mo steel.

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Section: Discussionmentioning

confidence: 99%

A modified time‐dependent failure assessment diagram for cracks in mismatched welds at high temperatures

Xuan

Wang

2006

Fatigue Fract Eng Mat Struct

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“…The yield-line theory method does not require an input of boundary stiffness or an array of structure parameters for modelling non-linearity of the material. The FE method (FEM) is usually used for the limit load analysis of different structures [15][16][17][18]. Numerical methods based on non-linear finite element analyses are increasingly popular, due to complexities of modern devices associated with their geometry and loading conditions.…”

Section: Introductionmentioning

confidence: 99%

Limit analysis of complex welds between plasma vessel and ports in W7-X cryostat system

Dundulis

Janulionis

Karalevičius

et al. 2017

Fusion Engineering and Design

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“…7–22 For instance, some closed-form limit load solutions for piping branch junctions have been recently proposed based on extensive FE results. 14–16,18–22 As noted above, the loading conditions on piping branch junctions can be complex; for example, internal pressure, in-plane bending to the branch or run pipe; out-of-plane bending to the branch or run pipe, and combinations thereof. For internal pressure, for in-plane bending and for combined pressure and in-plane bending, closed-form limit load solutions were given.…”

Section: Introductionmentioning

confidence: 99%

Plastic limit loads for piping branch junctions under out-of-plane bending

Lee

Ying-hu

Jeon

et al. 2011

The Journal of Strain Analysis for Engineering Design

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This paper presents approximate closed-form plastic limit load solutions for branch junctions under out-of-plane bending and under combined pressure and out-of-plane bending, based on three-dimensional finite element limit analyses for an elastic-perfectly plastic material. When bending is applied to the branch pipe, the plastic limit loads for out-of-plane bending are shown to be lower than those for in-plane bending. However, for bending to the run pipe, the opposite trend is found. For combined pressure and out-of-plane bending, either the circular interaction or the parabolic interaction rule can be used, depending on the bending location and the branch geometry. Comparison with published experimental plastic limit load data shows that the predictions agree relatively well with the test data.

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Finite element-based limit load of piping branch junctions under combined loadings

Cited by 19 publications

References 15 publications

A modified time‐dependent failure assessment diagram for cracks in mismatched welds at high temperatures

A modified time‐dependent failure assessment diagram for cracks in mismatched welds at high temperatures

Limit analysis of complex welds between plasma vessel and ports in W7-X cryostat system

Plastic limit loads for piping branch junctions under out-of-plane bending

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