Local strain estimation method for low- and high-cycle fatigue strength evaluation

Saiprasertkit, Kawin; Hanji, Takeshi; Miki, Chitoshi

doi:10.1016/j.ijfatigue.2012.01.021

Cited by 17 publications

(5 citation statements)

References 9 publications

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“…Saiprasertkit et al conducted high/low‐cycle fatigue experiments and numerical simulations to assess the fatigue performance comprehensively considering the material properties and joints geometries in LCWJ. Meanwhile, the corresponding low‐cycle fatigue analytical solutions incorporating material heterogeneity and geometry variations were also proposed extending the elastic fracture mechanics theory by effective notch strain method . In addition, some fatigue designs of metallic components made by advanced manufacturing processing were evaluated according to local stress or energy method .…”

Section: Introductionmentioning

confidence: 99%

“…Meanwhile, the corresponding low-cycle fatigue analytical solutions incorporating material heterogeneity and geometry variations were also proposed extending the elastic fracture mechanics theory by effective notch strain method. 41 In addition, some fatigue designs of metallic components made by advanced manufacturing processing were evaluated according to local stress or energy method. [42][43][44][45] Strain energy density analytical solutions for NLCWJ can be obtained from NSIF analytical solutions proposed by Livieri.…”

Section: Introductionmentioning

confidence: 99%

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Fatigue assessment of steel load‐carrying cruciform welded joints by means of local approaches

Song

Liu

Razavi

2018

Fatigue Fract Eng Mat Struct

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In this paper, local approaches are employed to analyse stress distributions, local fatigue indicators of weld toe, and weld root in load‐carrying cruciform welded joints (LCWJs). An extension of previous available equations is applied herein to calculate the approximate notch strain energy density (SED) based on the notch stress intensity factors (NSIFs) of LCWJ. The extending range of applicability is useful to explain various geometry effects comprehensively of LCWJ under cyclic tension and bending. By employing these extended equations, SED values can be rapidly evaluated without any finite element calculations. The NSIF and SED values obtained according to proposed analytical solutions are first validated by comparing finite element data from several stimulations in LCWJ models, resulting in a good agreement. Moreover, the failure transition relationship between weld toe and weld root is assured by SED values considering variations of notch angles. As a preliminary validation, the accuracy and reliability of proposed analytical model in this paper are checked by several experimental data generated from testing under fatigue loading. The good agreements between the experimental results and existing scatter bonds based on local NSIF, SED, and peak stress method fatigue design standards establish reliable basis for validation of the present analytical equations.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Fatigue assessment of steel load‐carrying cruciform welded joints by means of local approaches

Song

Liu

Razavi

2018

Fatigue Fract Eng Mat Struct

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“…The local approaches (the notch stress intensity factor (N-SIF) approach [37,38], the notch strain approach [39,40], and the peak stress methods [41,42]); -…”

Section: Figure 12mentioning

confidence: 99%

“…The effective notch strain (ENSN) approaches were applied for the detection of the crack initiation by Saiprasertkit et al [39,40] to cruciform welded joints used in steel bridges and offshore platforms [93], who described the fatigue life as the number of cycles when the maximum load dropped by 20% due to crack propagation.…”

Section: Local Approachesmentioning

confidence: 99%

Review of Fatigue Assessment Approaches for Welded Marine Joints and Structures

Corigliano

Crupi²

2022

Metals

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Welded joints are widely used in many sectors and represent the main joining technique also in the marine industry. The welded joints are sites of high stress concentrations and are subject to severe conditions for the marine environment. The design of marine welded joints has to consider the effects from wave loads, ship motions and loading/unloading operations and corrosion effects. The aim of this scientific work is to discuss about the state of the art of the standards and the approaches for predicting the fatigue life of welded joints used for the marine industry. Several approaches are examined in order to provide an overview and highlight the advantages and limitations of each method. Furthermore, recent advances in welding of dissimilar metals and autonomous welding are considered.

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“…Critical distance methods (CDMs) [28,29] involve determining a critical distance from a stress concentration beyond which the influence on crack initiation and growth diminishes; thus, the effective stress that causes failure can be observed at a certain distance from the hot spot using the point method (PM) or the average along a line (LM), an area (AM), or a specific volume (VM). Notch strain approaches [30,31] provide a comprehensive assessment of stress concentrations in welded joints, offering advantages such as the incorporation of nonlinear stress effects and the consideration of geometric complexities. Some of them were also enhanced to account for a multiaxial stress state [22,[32][33][34][35][36][37].…”

Section: Introductionmentioning

confidence: 99%

Digital Image Correlation Structural Strain Analysis of S235 Fillet-Welded Joints under Low-Cycle Fatigue Loadings

Corigliano,

Dong

2024

JMSE

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The main objectives of the present study were the application and validation of the newly proposed Digital Image Correlation equivalent structural strain approach for assessing the low-cycle fatigue life of S235 welded joints. Low-cycle fatigue tests were performed at a displacement ratio of minus one. Experimental tests were performed using two different ways of controlling the displacement amplitude: applying traditional low-cycle fatigue tests at a constant amplitude and stepwise succession tests at increasing amplitudes. A comprehensive, independent experimental procedure, proposed by the authors and not yet validated for steel welded joints, was applied to assess the equivalent structural strain range using the Digital Image Correlation technique for the traditional low-cycle fatigue tests and stepwise succession tests at increasing amplitudes. It is noteworthy that the values of the DIC equivalent structural strain (ΔEs from the DIC), calculated on the external sides of the samples, were utilized to predict fatigue life in correlation with the ASME mean curve and fall within the ±3σ scatter bands (external bands). In particular, most of the tests lie within the ±2σ boundary of the design curves except for some tests at low applied displacements. Moreover, it was shown that this method is applicable to stepwise succession tests with increasing displacement amplitudes, leading to significant time savings compared to conventional experimental tests.

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Local strain estimation method for low- and high-cycle fatigue strength evaluation

Cited by 17 publications

References 9 publications

Fatigue assessment of steel load‐carrying cruciform welded joints by means of local approaches

Fatigue assessment of steel load‐carrying cruciform welded joints by means of local approaches

Review of Fatigue Assessment Approaches for Welded Marine Joints and Structures

Digital Image Correlation Structural Strain Analysis of S235 Fillet-Welded Joints under Low-Cycle Fatigue Loadings

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