Fatigue strength capacity of load-carrying fillet welds on ultra-high-strength steel plates subjected to out-of-plane bending

Ahola, Antti; Björk, Timo; Barsoum, Zuheir

doi:10.1016/j.engstruct.2019.109282

Cited by 20 publications

(17 citation statements)

References 21 publications

(25 reference statements)

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“…where ΔF is the unit force range (force/length), a eff is the effective throat thickness, and Δσ m is the membrane stress at the plate component. In the prior investigation [22], fracture mechanics-based analysis showed that the weld root fatigue strength improvement gained by weld penetration refers to external throat thickness summed with weld penetration depth, p (see also dimensions shown in Fig. 2b) in the axially loaded cruciform joints.…”

Section: Axial Loadingmentioning

confidence: 94%

“…Nevertheless, this model still lacks experimental validation, and this work aims to verify different models for assessing weld root failures using NWSs. In a previous work [22], an analytical method, different to the new model proposed in the final draft of the new revision of EC3, parts 1-9 [6], for calculating NWSs under bending loading, was proposed using the limited number of experimental fatigue test data. The results showed in accordance with the FAT36 design curve applied in association with the nominal stress approach.…”

Section: Introductionmentioning

confidence: 99%

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On the interaction of axial and bending loads in the weld root fatigue strength assessment of load-carrying cruciform joints

et al. 2022

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Current design standards and recommendations incorporate the nominal stress system for assessing the fatigue strength capacity of load-carrying cruciform (LCX) joints with the fillet welds and failing from the weld root. Thus far, bending-loaded joints have not been addressed in these standards. The aim of the present study is to investigate the fatigue performance of LCX joints subjected to cyclic axial and bending loads. Firstly, fatigue test data sets of such joints subjected to axial loading and bending loads in the adjoined plate component are extracted from the literature, and statistical analyses are carried out to evaluate the fatigue strength capacity using the nominal weld stresses (NWSs). Secondly, experimental fatigue tests are carried out on LCX joints made of ultra-high-strength steel (UHSS) grade using constant amplitude loading and subjected to combined axial and bending load to study the load interaction effects on the fatigue strength capacity. The results showed that the FAT36 detail category for the weld root failures is applicable for bending-loaded joints when applying NWSs calculated on the basis of effective throat thickness of weld and assuming linear-elastic stress distribution over the joint section. The effective notch stress analyses showed unconservative results for the tested joints, when applying FAT225 design curve with the reference radius of rref = 1.0 mm.

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Section: Axial Loadingmentioning

confidence: 94%

Section: Introductionmentioning

confidence: 99%

On the interaction of axial and bending loads in the weld root fatigue strength assessment of load-carrying cruciform joints

et al. 2022

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“…Thus, the life for welded joints and components is dominated by fatigue crack growth. Further, it illustrates the reliability and popularity of fatigue strength and fatigue life assessments for different failure modes in welded joints (Zhang et al, 2018;Ahola et al, 2019a;Chapetti and Steimbreger, 2019;Liu et al, 2020). The contribution of either fatigue crack initiation or propagation onto the fatigue life is strongly influenced by the material properties and loading conditions.…”

Section: Introductionmentioning

confidence: 90%

Low-Cycle Fatigue Life Prediction of 10CrNi3MoV Steel and Undermatched Welds by Damage Mechanics Approach

Song

Liu

et al. 2021

Front. Mater.

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Welding of steel is a technique frequently used in practical engineering applications; however, their mechanical performance is strongly dependent on the physical metallurgical status of the weldments. In the present study, fully reversed, strain-controlled low-cycle fatigue (LCF) tests were conducted on 10CrNi3MoV steel and its undermatched weldments with strain amplitudes varying from Δε = ±0.5 to ±1.2%. Both base metal and weldments exhibited softening behavior at the beginning of the cyclic stage. Numerical investigations of cyclic stress–strain evolutions of the materials have been studied by the cyclic plastic model considering nonlinear hardening. The continuous damage mechanics (CDM) theory based on the experimental hysteresis stress–strain energy concept was employed to illustrate LCF failure, including damage initiation and deterioration. The damage mechanics approach calibrates the material parameters from the measured fatigue life for initiation and growth stages. Afterward, the combination of material cyclic plastic parameters and damage parameters was implemented to predict the LCF life. Good agreement can be observed between the experimental results and the FE results based on the CDM approach. Finally, the damage evolution of the materials under different strain amplitudes by this approach was assessed.

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“…The FRANC2D/L analysis was carried out in two stages with CASCA, which is a mesh generator with the capability to produce different types of mesh. In the second part, the boundary conditions, problem characteristics, stress analysis, input crack singularities, crack propagation, and the problem conclusion were determined [30,31]. In FRANC2D, the stress intensity factor was determined using the J-Integral method, which was calculated using the equivalent domain integral method, and the Energy Release Rate method, which was calculated using the crack-closing method.…”

Section: Franc2d/l Proceduresmentioning

confidence: 99%

Two- and Three-Dimensional Numerical Investigation of the Influence of Holes on the Fatigue Crack Growth Path

Fageehi

2021

Applied Sciences

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Problems in fracture mechanics are difficult when the appropriate analysis is unspecified, which is very common in most real-life situations. Finite element modeling is thus demonstrated to be an essential technique to overcome these problems. There are currently various software tools available for modeling fracture mechanics problems, but they are usually difficult to use, and obtaining accurate results is not an obvious task. This paper illustrates some procedures in two finite element programs to solve problems in two- and three-dimensional linear-elastic fracture mechanics, and an educational proposal is made to use this software for a better understanding of fracture mechanics. Crack modeling was done in a variety of ways depending on the software. The first is the well-known ANSYS, which is usually utilized in industry, and the second was a freely distributed code, called FRANC2D/L, from Cornell University. These software applications were used to predict the fatigue crack growth path as well as the associated stress intensity factors. The predicted results demonstrate that the fatigue crack is turned towards the hole. The fatigue crack growth paths are influenced by the varying positions and sizes of single holes, while two symmetrically distributed holes have no effect on the fatigue crack growth direction. The findings of the study agree with other experimental crack propagation studies presented in the literature that reveal similar crack propagation trajectory observations.

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Fatigue strength capacity of load-carrying fillet welds on ultra-high-strength steel plates subjected to out-of-plane bending

Abstract: Björk, Z. Barsoum (2019). Fatigue strength capacity of load-carrying fillet welds on ultra-high-strength steel plates subjected to out-of-plane bending, Engineering Structures, 196, 109282. The article has been published in its final form at

Cited by 20 publications

References 21 publications

On the interaction of axial and bending loads in the weld root fatigue strength assessment of load-carrying cruciform joints

On the interaction of axial and bending loads in the weld root fatigue strength assessment of load-carrying cruciform joints

Low-Cycle Fatigue Life Prediction of 10CrNi3MoV Steel and Undermatched Welds by Damage Mechanics Approach

Two- and Three-Dimensional Numerical Investigation of the Influence of Holes on the Fatigue Crack Growth Path

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