Strain-life fatigue assessment of scanned weld geometries considering notch effects

Niederwanger, Andreas; Ladinek, Markus; Lener, Gerhard

doi:10.1016/j.engstruct.2019.109774

Cited by 10 publications

(5 citation statements)

References 47 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Once the geometrical parameters have been estimated, it is possible to estimate the Weibull parameters of Eq. (25). The method of the PWMs has been applied for this task, see [36].…”

Section: The Stüssi Model For the Strain Rangementioning

confidence: 99%

See 1 more Smart Citation

Probabilistic relationships between strain range, stress range and loading cycles. Application on ASTM A969 steel

Caiza

Ummenhofer

2020

International Journal of Fatigue

View full text Add to dashboard Cite

Fatigue life estimations can be made by considering the -N or -N curves. Reliable estimations allow engineers designing save stress levels in structures or machines. In this paper, the Weibull distribution is combined with the Stüssi function to model the quantiles of the -N and -N curves and the Ramberg-Osgood relationship. The nonlinear Stüssi function offers a good geometric approach to model the relationship -N or -N and the Weibull distribution is the most adequate to handle lifetime magnitudes as load cycles N. To show the application of the proposed model, simulated and experimental data of ASTM A969 steel are evaluated.

show abstract

“…Once the geometrical parameters have been estimated, it is possible to estimate the Weibull parameters of Eq. (25). The method of the PWMs has been applied for this task, see [36].…”

Section: The Stüssi Model For the Strain Rangementioning

confidence: 99%

“…At the present time, modelling the strain-life and stress-life curves is still a very important research topic in steel structures. For instance, several applications on riveted steel structures have been recently done by considering the models mentioned above, see [23][24][25][26].…”

Section: Introductionmentioning

confidence: 99%

Probabilistic relationships between strain range, stress range and loading cycles. Application on ASTM A969 steel

Caiza

Ummenhofer

2020

International Journal of Fatigue

View full text Add to dashboard Cite

show abstract

“…For example, Ghahremani et al [22] used a handheld laser scanner to determine the geometric dimensions of treated welded joints. Niederwanger et al [23,24] applied 3D laser scanning to obtain the real weld geometries and introduced the geometric information into the evaluation to reduce the scatter of fatigue life due to geometry variations for each weld of different specimens. More recently, Shojai et al [25] investigated structural steel specimens of offshore wind support structures with pitting using a 3D scanner and analysed the influence of the pitting corrosion and related stress concentrations on the fatigue strength of the support structures.…”

Section: Introductionmentioning

confidence: 99%

Geometric Properties of Steel Components with Stability and Fatigue Risks Using 3D-Laser-Scanning

Li,

Zhang,

Shi

et al. 2024

Buildings

View full text Add to dashboard Cite

Nowadays, 3D laser scanning technology is extensively employed in laboratory investigations of steel structural components, providing accurate geometric dimensions to reduce uncertainties caused by indeterminate geometry in experimental results. It is often used in conjunction with the Finite Element (FE) Method and analytical solutions, which are more accurate deterministic operators in the research on steel structures. However, establishing a common methodological framework for transferring or mapping 3D-scanned information into finite element models for complex steel structures with stability and fatigue risks remains an ongoing task. In light of this, this study has developed a 3D scanning platform capable of obtaining accurate geometric dimensions for various types of steel components. Different coordinate systems and point cloud mapping algorithms have been established for different types of components to construct actual finite element models with initial imperfections. The feasibility of the self-developed 3D scanning platform and finite element modelling has been validated through three experimental cases: weld details, steel girders, and cylindrical shells. The research findings demonstrate that the captured point cloud can be automatically processed and corrected using the developed algorithm. The scanned data can then be input into the numerical model using various mapping algorithms tailored to the specific geometric properties of the specimens. The differences between the experimental test results and the simulated results obtained from the 3D-scanned finite element models remain within a small range. The self-developed 3D scanning platform and finite element modelling technique effectively capture the actual dimensions of different steel components, enabling the prediction of their stability and fatigue risks through numerical simulations.

show abstract

“…The research utilizing modern measurement methods has applied scanned weld geometry mostly for numerical simulations of stress concentrations, focusing on the influence of weld geometry parameters such as the flank angle and transition radius (see, e.g., [40,48]). Most of the existing research on weld notch parameters focuses on the non-local geometric parameters and is based on a 2D idealization of continuous undercuts in arc-welded joints, despite the significant 3D presence of weld notches.…”

Section: Introductionmentioning

confidence: 99%

Local weld geometry-based characterization of fatigue strength in laser-MAG hybrid welded joints

2023

View full text Add to dashboard Cite

This research studies the influence of local weld notch parameters on fatigue crack initiation sites in laser-hybrid butt welds, utilizing high-resolution 3D scans and fatigue tests to failure. The suitability of different local geometric weld notch parameters for fatigue strength characterization is investigated, and the current challenges associated with their measurements are highlighted. The weld notch shapes were found to fluctuate significantly, resulting in considerable variation in notch parameters over short intervals. Undercut depth was found to determine the critical location for crack initiation. There were several instances where the fatigue crack initiated from notches with large radii despite the presence of sharper notches, contrary to what is expected on the basis of previous investigations. The results of the present study indicate that the undercut depth is a suitable fatigue strength indicator for high-quality laser-MAG hybrid welds, overcoming the practical limitations of notch radius measurement.

show abstract

Strain-life fatigue assessment of scanned weld geometries considering notch effects

Cited by 10 publications

References 47 publications

Probabilistic relationships between strain range, stress range and loading cycles. Application on ASTM A969 steel

Probabilistic relationships between strain range, stress range and loading cycles. Application on ASTM A969 steel

Geometric Properties of Steel Components with Stability and Fatigue Risks Using 3D-Laser-Scanning

Local weld geometry-based characterization of fatigue strength in laser-MAG hybrid welded joints

Contact Info

Product

Resources

About