An extrapolation method to determine the effective notch stress in welded joints

Pradana, Mochamad Raditya; Qian, Xudong; Swaddiwudhipong, S.

doi:10.1111/ffe.12307

Cited by 14 publications

(23 citation statements)

References 29 publications

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“…Pradana et al have shown that for full‐penetration welded cruciform joints, the stress fields from the sharp and rounded notch ( r ref = 1 mm) converge at a distance about 2% of the plate thickness from the weld toe, as illustrated in Fig. a.…”

Section: The Extrapolation Methodsmentioning

confidence: 99%

“…The computation of a C value for a specific X‐joint requires (1) FE model with a ‘sharp’ toe that provides A and B values and (2) FE model with a ‘rounded’ toe that computes the ENS according to the IIW 2 procedure. Figure b illustrates the one‐eighth FE model used for the brace axial tension cases, as well as the typical mesh at both ‘rounded’ and ‘sharp’ weld toe, where the element sizes follow the recommendation by Pradana et al The model simulates the X‐joint using 20‐node brick elements with reduced integration (C3D20R) in the ABAQUS element library. Both the base metal and the weld (AWS CJP profile) adopt the same linear‐elastic material model with a Young's modulus of 205 GPa and a Poisson ratio of 0.3.…”

Section: Numerical Investigationmentioning

confidence: 99%

“…The proposed method relies on a power‐law‐based extrapolation of the near‐toe surface stresses, up to a point where the stress equals the ENS. The proposed ENS extrapolation method demonstrates good accuracy in estimating the weld toe ENS for cruciform joints and tube‐to‐plate joints and, thus, holds the potential for CHS joints where the benefit of the simplified modelling becomes more substantial.…”

Section: Introductionmentioning

confidence: 97%

“…This paper aims to verify and extend the ENS extrapolation method to CHS X‐joints, which represent a common connection configuration in engineering structures. Similar to the original work by Pradana et al , the current extrapolation is applicable only for the ENS at weld toes, which, in the case of CHS X‐joints, is the likely fatigue crack initiation site. The current paper describes the development of the extrapolation scheme in the following sections.…”

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

An extrapolation method to determine the effective notch stress in circular hollow section X‐joints

Pradana

Qian

Swaddiwudhipong

et al. 2016

Fatigue Fract Eng Mat Struct

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This paper presents an extrapolation method to determine the effective notch stress (ENS) on the weld toes of welded circular hollow section (CHS) X‐joints in‐line with the extrapolation method to determine the structural hot‐spot stress in existing design guidelines. This investigation verifies and extends the recently proposed ENS extrapolation scheme to CHS X‐joints, which elevates significantly the difficulty in generating a weld toe radius along the brace‐to‐chord intersection as required in existing guidelines. An extensive numerical study then investigates the ENS extrapolation for CHS X‐joints under three loading conditions, namely, the brace axial load, the brace in‐plane bending load, and the brace out‐of‐plane bending load. The numerical study derives a set of recommended extrapolation parameters that ensures accurate ENS estimation for each loading condition. This paper demonstrates that the proposed extrapolation method for the CHS X‐joints yields good agreement with the standard ENS calculation procedure described in the International Institute of Welding (IIW) guideline.

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Section: The Extrapolation Methodsmentioning

confidence: 99%

Section: Numerical Investigationmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 97%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

An extrapolation method to determine the effective notch stress in circular hollow section X‐joints

Pradana

Qian

Swaddiwudhipong

et al. 2016

Fatigue Fract Eng Mat Struct

Self Cite

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show abstract

“…Methods for calculating the fatigue life of notched components can be divided into local and non-local. [19][20][21][22][23] The non-local methods take into account the influence of the stress gradient and define a zone which is considered as equivalent and in which significant fatigue processes take place. The first is global, where calculations are performed based on nominal stress, external forces and fatigue notch factor K f .…”

Section: Introductionmentioning

confidence: 99%

Non‐local line method for notched elements with use of effective length calculated in an elasto‐plastic condition

Krzyżak

Robak

Łagoda

2016

Fatigue Fract Eng Mat Struct

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The paper presents a non‐local line method used to the fatigue life calculation of notched elements. The presented method is based on the concept of an effective length which determines the size of the equivalent fatigue zone. Effective values of normal stress calculated in the critical plane with a weight function were applied when determining the equivalent fatigue zone. Simulation studies were performed for two types of steel and two types of loading. Five different series of tests and simulations were used. Experimental studies were carried out for 40 HM‐T and EA4T steels. These materials are used in railway industry, including the manufacturing of coupling bars. The notched test specimens contained notches with a tip radius of 0.2, 0.5, 0.8 and 1 mm. Stress calculations were performed using the finite element method by adopting cyclic material properties described by the model of a multi‐linear hardening. Non‐local calculations were performed in a defined critical plane for normal stress distribution and a weight function. As a result, the function of variation of the effective length depending on the loading level and geometry of the notch has been determined.

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Fatigue damage analysis of reinforced concrete column considering low‐cycle behavior of HRB400 steel

Xiao

Zhang

et al. 2019

Structural Design Tall Build

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In this study, a damage model-based fatigue behavior is proposed. To consider the fatigue behavior of steel in the damage model, the experimental research on reinforcing steel bar grades HRB400 was presented. The monotonic tension test and lowcycle fatigue test were carried out. The plastic strain amplitude-fatigue cycle (ε p -2N f ) curve and plastic strain amplitude-strength loss factor (ε p -ϕ SR ) curve were obtained. The fatigue parameters (C f , C d , and α) were proposed by nonlinear fitting.The specimens were simulated using the "Reinforcing Steel" material in "OpenSees"program. These fatigue parameters were proved to accurately describe the fatigue behavior of HRB400 rebar. Moreover, to verify the application of fatigue damage model in RC column, fiber-based element models were established based on the quasi-static cyclic test on RC columns. The calculated results agreed well with those of the tests. The damage degree of RC column was calculated by the recorded stressstrain curves of material. The proposed fatigue parameters could be referred in damage model based on material fatigue behavior. KEYWORDS damage index, low-cycle fatigue, numerical analysis, reinforcing steel bar, seismic behaviorThe current reinforced concrete (RC) structures such as bridge, crane beam, and high-rise buildings bear not only the static loading but also cyclic loading . [1,2] Structures experience deformations beyond the yielding stage in long-term situation. [3] This may lead to brittle failure characterized by insufficient utilization of material strength. [4,5] For taking full advantages of material mechanical properties in structural design, reliable methods to predict fatigue damage are recommend.Recently, various damage models for appraising structural performance state have been proposed. [6][7][8][9] Park-Ang gave the classical doubleparameter model, which depended on both of maximum deformation and hysteretic energy. [10] This model considered the interaction between accumulated damage and structural response. Guo et al. [11] extended the application of Park-Ang model to three-dimensional case; it was reliable in evaluating the damage under coupling of axial loading and bidirectional bending. Fu and Liu [12] took various displacement amplitudes and load sequence into account, whereas effective energy dissipation factor and load sequence factor were introduced. These works attempted to precisely quantify the damage degree. After that, the fatigue of material was found to influence damage degree, as the accumulated hysteretic energy and inelastic deformation resulted in the change of material mechanical properties. [13] Castillo et al. [14] generalized the Weibull model for predicting fatigue behavior at any stress level. The fatigue life of structure can be estimated by these fatigue damage model.It was concluded that the fatigue performance of structure was directly influenced by the fatigue behavior of reinforcement. [15] Zanuy et al. [16] conducted the fatigue test on RC box-girder bridges. The relationship between...

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An extrapolation method to determine the effective notch stress in welded joints

Cited by 14 publications

References 29 publications

An extrapolation method to determine the effective notch stress in circular hollow section X‐joints

An extrapolation method to determine the effective notch stress in circular hollow section X‐joints

Non‐local line method for notched elements with use of effective length calculated in an elasto‐plastic condition

Fatigue damage analysis of reinforced concrete column considering low‐cycle behavior of HRB400 steel

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