An algorithm for statistical evaluation of weld toe geometries using laser triangulation

Renken, Finn; Polach, Franz von Bock und; Schubnell, Jan; Jung, Matthias; Oswald, Markus; Rother, Klemens; Ehlers, Sören; Braun, Moritz

doi:10.1016/j.ijfatigue.2021.106293

Cited by 24 publications

(16 citation statements)

References 27 publications

(41 reference statements)

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“…It seems that the loglogistic distribution is the most suitable distribution for all parameters. Similar results can be seen in [26,28].…”

Section: Influence Of Deep Rolling On Weld Geometrysupporting

confidence: 91%

“…In general, small notch radii and large flank angles have a stress-increasing effect [24]. To determine the local weld toe parameters various methods exist in the literature [1,[25][26][27][28]. In general, the determination of the weld toe parameters is based on two-dimensional geometry data sets perpendicular to the weld seam.…”

Section: Determination Of the Local Weld Toe Parametersmentioning

confidence: 99%

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Automated geometry measurement and deep rolling of butt welds

et al. 2022

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During the joining of two metal sheets by welding, a process-specific geometry of the weld is created. The local geometry of the created weld has a decisive influence on its fatigue strength. This is due to stress concentration at the geometric notches. In this paper, a process known from mechanical engineering called deep rolling is applied on butt welds. The influence on the local weld geometry and the local stress concentration after deep rolling is investigated. Additionally, a novel automated measurement system using optical laser line scanning is presented. The system is qualified for the evaluation of the local weld geometry regarding its flank angles and toe radii. The presented investigations show that the deep rolling process influences the stress concentrations determined by 2D-FE-simulations using real scan data. A correlation between the difference in toe radii or local notch stresses before and after deep rolling and the initial flank angle was found. This indicates that there are process and geometry specific conditions for the successful application of the deep rolling process.

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“…It seems that the loglogistic distribution is the most suitable distribution for all parameters. Similar results can be seen in [26,28].…”

Section: Influence Of Deep Rolling On Weld Geometrysupporting

confidence: 91%

Section: Determination Of the Local Weld Toe Parametersmentioning

confidence: 99%

Automated geometry measurement and deep rolling of butt welds

et al. 2022

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“…Typically, cracks initiate from one or more locations in weld transitions, such as weld toes, starting from an imperfection or from the point of highest stress concentration, and retain during their growth approximately a semi-elliptical shape. In welded joints, the weld shape often varies considerably along weld seams [22]. It is thus often required to idealize weld shapes to ease assessment procedures.…”

Section: Aspects Related To Welded Jointsmentioning

confidence: 99%

Fatigue Crack Initiation and Propagation Relation at Notched Specimens with Welded Joints Characteristics

Braun¹,

Fischer²,

Baumgartner³

et al. 2022

Preprint

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The fatigue life of welded joints under cyclic loading is a complex process that can be roughly divided into fatigue crack initiation, crack propagation and final fracture. Usually, these phases are evaluated separately. Several methods are available to estimate the extent of the different phases in welded components, such as stress-based fatigue concepts for crack initiation or linear elastic fracture mechanics for crack propagation; however, distinguishing these phases in welded components is a complex procedure and often relies on assumptions such as transition crack sizes. The objective of this study is to investigate the relationship between fatigue crack initiation and propagation in welded joints using artificially notched specimens with welded joints characteristics of different notch acuity (different radii and opening angle). The experiments show that the investigated relationship basically depends on the notch acuity, the load level and the stress ratio.

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“…Before the fatigue tests, the misalignment and weld geometry of all specimens were measured. For the latter, laser triangulation and the curvature method were applied, see [39,40]. This is required since the nominal stress assessment of cruciform joints failing from weld roots is based on the stress acting on the weld.…”

Section: Materials and Test Specimensmentioning

confidence: 99%

Statistical analysis of sub-zero temperature effects on fatigue strength of welded joints

Braun

2021

Weld World

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Ships and offshore structures in Arctic environments are exposed to severe environmental actions and sub-zero temperatures. Thus, the design of such structures has to account for the Arctic environment and must be cost-efficient at the same time. A vital part of the design process is to ensure that fatigue-induced failure does not occur in the lifetime of the structure. While effects of high temperatures on material behavior are well covered in international standards and guidelines, there is no comprehensive guidance for sub-zero temperature fatigue strength assessment. Additionally, stress-life (S–N) test data of welded joints at sub-zero temperatures is particularly scarce. Hence, this study presents an extensive review of recent test results of various weld details tested in the range of − 50 to 20 °C. This data could build the basis for future considerations of temperature effects in fatigue design guidelines and recommendations. For this purpose, the fatigue test results are submitted to a rigorous statistically assessment—including a summary of the limitations of current design guidelines with respect to sub-zero temperature effects.

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An algorithm for statistical evaluation of weld toe geometries using laser triangulation

Cited by 24 publications

References 27 publications

Automated geometry measurement and deep rolling of butt welds

Automated geometry measurement and deep rolling of butt welds

Fatigue Crack Initiation and Propagation Relation at Notched Specimens with Welded Joints Characteristics

Statistical analysis of sub-zero temperature effects on fatigue strength of welded joints

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