A numerical method for determining the fatigue strength of welded joints with a significant improvement in accuracy

Lener, Gerhard; Lang, Robert E.; Ladinek, Markus; Timmers, Ralph

doi:10.1016/j.proeng.2018.02.036

Cited by 15 publications

(7 citation statements)

References 16 publications

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“…The effective notch stress method is a local stress approach, which has a large research background in the international literature (Olivier et al 1989;Olivier et al 1994;Niemi 2002;Radaj 1996;Lener et al 2018). The basic idea of this method stems from Neuber's micro-support hypothesis (Olivier et al 1989;Olivier et al 1994).…”

Section: Effective Notch Stress Approachmentioning

confidence: 99%

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Discussion on the Hot-Spot and Notch Stress Based Fatigue Assessment Methods Based on Test Results

Mecséri

Kövesdi

2020

Int J Steel Struct

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The focus of the current paper is the investigation of different local stress calculation methods for fatigue design. To evaluate the accuracy and applicability of the hot-spot and effective notch stress (ENS) fatigue assessment methods an experimental and numerical research program is carried out at the BME Department of Structural Engineering, in Hungary. Two types of structural details are tested using 32 test specimens, a cruciform and a gusset plate type joint. The test results and the accompanying numerical calculation results are statistically evaluated and compared. Analysing the results of the fatigue tests and numerical calculations, it is concluded, that both the hot-spot and the ENS method could be used for fatigue design of the cruciform joints according to the recommendation of the IIW (Hobbacher in Recommendations for fatigue design, Springer, Paris, 2004). However, the rules of the ENS method needs improvement, if used for the design of gusset plate type joint. According to the current results, the ENS method can be adjusted to make applicable for the gusset plate joints as well, recommendation for that is presented in the current paper.

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Section: Effective Notch Stress Approachmentioning

confidence: 99%

“…3D finite element models for both specimen types are developed in ANSYS 17.2 (Lener et al 2018). The parameters of .…”

Section: Numerical Models For Hot-spot Stress Approachmentioning

confidence: 99%

Discussion on the Hot-Spot and Notch Stress Based Fatigue Assessment Methods Based on Test Results

Mecséri

Kövesdi

2020

Int J Steel Struct

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“…For this purpose, simulation approaches based on finite element (FE) analysis of the weld are predominantly used. Lang R. et al [11][12][13], as well as Lener et al [14], presented a framework for scanning and simulation of the weld geometry using a statistical approach and a Weakest-link fatigue model. It is noted that the influence of local surface defects is phenomenologically included in the Weakest-link model [15].…”

Section: Introductionmentioning

confidence: 99%

Digital Scanning of Welds and Influence of Sampling Resolution on the Predicted Fatigue Performance: Modelling, Experiment and Simulation

Hultgren

Myrén

Barsoum

et al. 2021

Metals

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Digital weld quality assurance systems are increasingly used to capture local geometrical variations that can be detrimental for the fatigue strength of welded components. In this study, a method is proposed to determine the required scanning sampling resolution for proper fatigue assessment. Based on FE analysis of laser-scanned welded joints, fatigue failure probabilities are computed using a Weakest-link fatigue model with experimentally determined parameters. By down-sampling of the scanning data in the FE simulations, it is shown that the uncertainty and error in the fatigue failure probability prediction increases with decreased sampling resolution. The required sampling resolution is thereafter determined by setting an allowable error in the predicted failure probability. A sampling resolution of 200 to 250 μm has been shown to be adequate for the fatigue-loaded welded joints investigated in the current study. The resolution requirements can be directly incorporated in production for continuous quality assurance of welded structures. The proposed probabilistic model used to derive the resolution requirement accurately captures the experimental fatigue strength distribution, with a correlation coefficient of 0.9 between model and experimental failure probabilities. This work therefore brings novelty by deriving sampling resolution requirements based on the influence of stochastic topographical variations on the fatigue strength distribution.

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“…This process involves three phases, namely signal collection, signal processing and result analysis. Regrettably, a fatigue signal is not easy to be obtained directly, and the acquisitions bear a high cost and consume a lot of time [8][9].…”

Section: Introductionmentioning

confidence: 99%

“…Errors would directly impact the attained outcomes, thus driving inappropriate inferences. Possessing accurate, precise strain measurement, through which the stresses can be attained, is one of the most significant estimators of fatigue [9,28,35]. One effort to eliminate the noise in a strain signal is filtering.…”

Section: Introductionmentioning

confidence: 99%

A Novel Way to Overcome Problems Arising in Strain Signal Measurements Leading to a Fatigue Failure Characterisation

Putra

Abdullah

Schramm

2020

IJAME

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The aim of this study is to identify the issues that arise when measuring a strain signal in order to characterise fatigue failure. In traditional methods, acquisition of a strain signal is constrained due to the presence of errors, time-consuming process and associated high cost. In this study, a new method for generating strain signals based on computer simulation was proposed. A strain gauge was positioned near the citical area pertaining to an automotive coil spring driven on road surfaces in order to measure strain signals. The strain signals were utilised for the inputs in the simulation. For validation purposes, the actual and simulated strain signals were examined by performing fatigue tests. The actual and simulated urban strain signals, respectively, required 412 and 415 reversals of blocks. For the rural road, the fatigue life was 137 and 139 reversals of blocks, respectively, for the actual and simulated strain signals. These indicated that simulated strain signals were accurately generated, providing a minimum fatigue life deviation, which was lower than 1.5 %. By developing the strain signals of a component through simulation, its integrity and fatigue failure can adequately be determined, thereby, saving the cost associated with operation and maintenance. Thus, the simulation is expected to assist the automotive industries involved with strain signal acquisition.

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A numerical method for determining the fatigue strength of welded joints with a significant improvement in accuracy

Cited by 15 publications

References 16 publications

Discussion on the Hot-Spot and Notch Stress Based Fatigue Assessment Methods Based on Test Results

Discussion on the Hot-Spot and Notch Stress Based Fatigue Assessment Methods Based on Test Results

Digital Scanning of Welds and Influence of Sampling Resolution on the Predicted Fatigue Performance: Modelling, Experiment and Simulation

A Novel Way to Overcome Problems Arising in Strain Signal Measurements Leading to a Fatigue Failure Characterisation

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