Fatigue strength assessment of load-carrying cruciform joints with material mismatching in low- and high-cycle fatigue regions based on the effective notch concept

Saiprasertkit, Kawin; Hanji, Takeshi; Miki, Chitoshi

doi:10.1016/j.ijfatigue.2011.12.016

Cited by 61 publications

(26 citation statements)

References 9 publications

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“…T It should be noted that the N root K  stands for the simplified form of mode I notch stress intensity factor. In order to calculate the NSIFs and SED by EFM method, Meneghetti [20] connects the peak stress with these results to obtain closed-form expression of NSIF and averaged SED values for different modes, which are written as follows:…”

Section: Notch Mechanics Theorymentioning

confidence: 99%

“…However, the process is computationally expensive and highly impractical for complex component geometries and/or long loading histories. Recently, Qian et al [19] and Saiprasertkit et al [20] provided explicit parametric expressions for non-load-carrying fillet welded joints and LCWJ considering different loading conditions and material properties based on a fictitious notch rounding concept. Hence, these analytical researches give us some inspiration to extend corresponding functions.…”

Section: Introductionmentioning

confidence: 99%

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High cycle fatigue assessment of steel load-carrying cruciform welded joints: an overview of recent results

Song

Liu

2018

Frattura Ed Integrità Strutturale

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In this paper, high cycle fatigue failure behavior of steel Loadcarrying Cruciform Welded Joints (LCWJ) is assessed by means of local approaches. Different analytical solutions for weld toe and weld root are extended and applied to illustrate the effects of LCWJ geometry under cycle tension and bending based on Notch Stress Intensity Factors (NSIFs). The extended analytical solutions are validated by comparing finite element data from several simulations in terms of LCWJ models, resulting in a good agreement. A bulk of experimental data taken from tests and the literature is calculated by the proposed solutions as the forms of SED, NSIF and Peak Stress Method (PSM). The results show that the NSIF-based analytical solutions for steel LCWJ are effective for high cycle fatigue failure analyses.

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Section: Notch Mechanics Theorymentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

High cycle fatigue assessment of steel load-carrying cruciform welded joints: an overview of recent results

Song

Liu

2018

Frattura Ed Integrità Strutturale

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“…To relinquish the detailed FE analysis, this study provides closed-form expressions to estimate the K e N and F values for welded cruciform joints with different geometries. The elastic-plastic material properties employed in this analytical formulation is the SM490 shown in Table 1 reported by Saiprasertkit et al 46 Influence of the main plate thickness (t) Figure 10(a) and (b) show respectively the elastic concentration factor K e N and F versus the main plate thickness (t) for different combinations of the attachment plate thickness to the main plate thickness (t 0 =t) and the weld leg size to half the main plate thickness (2h=t). The local weld geometry is the fictitious notch radius (r) of 1 mm and notch angle (u) of 458.…”

Section: Geometric Parametric Study Of K N E and Fmentioning

confidence: 99%

A modified Neuber’s rule for welded cruciform joints under low-cycle actions

Feng

Qian

2017

The Journal of Strain Analysis for Engineering Design

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This article presents a modified Neuber's rule to estimate the inelastic stress and strain at the toe of welded plate connections under large-scale cyclic yielding, caused by the low-cycle fatigue loadings. In contrast to the original Neuber's rule, which usually overestimates the notch-tip elastic-plastic stress and strain as the applied nominal stress approaches or exceeds the material yield strength, the modified Neuber's rule provides a convenient and accurate estimation of the stress and strain at the weld toe as an alternative to the time-consuming numerical computation. The numerical study covers the variations in both the geometric configuration and the material properties in the modified Neuber's rule. This article also provides closed-form expressions for the two critical parameters in the modified Neuber's rule to facilitate engineering applications.

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“…Since FEM models used the effective notch shape, the equivalent total strain range could be calculated by using the effective notch concept 10) . The effective notch concept was employed in the elements along the notch.…”

Section: B) Calculation Of Effective Notch Strain Rangementioning

confidence: 99%

“…Fatigue life was found to be dominated by total strain range rather than strain rate effect. In addition, a previous study 10) proposed fatigue life based on strain as shown in Equation 7. However, the previous study conducted experiments on load-carrying cruciform joint, which was considered a sharp notch shape.…”

Section: (7) Fatigue Life Due To the Strain Rate Effectmentioning

confidence: 99%

Effects of High Strain Rate on Low-Cycle Fatigue Behavior of Structural Steel in Large Plastic Strain Region

2016

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This study aims to investigate the effects of very high strain rate on low-cycle fatigue behavior of structural steel under large plastic strain with strain rate order of 1.0 s-1 as expected during earthquakes. Low-cycle fatigue tests were conducted using compact-tension specimens at various strain rate levels. Fatigue life based on crack size indicated that the higher strain rate caused lower fatigue life in large plastic strain region. The energy approach was employed to clarify the low-cycle fatigue mechanism in this region. Finally, a prediction method for fatigue life regarding high strain rate effect in large plastic strain region is proposed in this study.

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Fatigue strength assessment of load-carrying cruciform joints with material mismatching in low- and high-cycle fatigue regions based on the effective notch concept

Cited by 61 publications

References 9 publications

High cycle fatigue assessment of steel load-carrying cruciform welded joints: an overview of recent results

High cycle fatigue assessment of steel load-carrying cruciform welded joints: an overview of recent results

A modified Neuber’s rule for welded cruciform joints under low-cycle actions

Effects of High Strain Rate on Low-Cycle Fatigue Behavior of Structural Steel in Large Plastic Strain Region

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