An XFEM based uncertainty study on crack growth in welded joints with defects

Wang, Benjin; Backer, Hans De; Chen, Airong

doi:10.1016/j.tafmec.2016.06.005

Cited by 31 publications

(8 citation statements)

References 23 publications

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“…Wang et al (2019a) employed a finite element method (FEM) to simulate the crack propagation of rib-to-deck single-sided welded joints, and validated it against fatigue experiments. Wang et al (2016) employed the extended FEM to simulate the fatigue crack growth of rib-to-deck welded joints. Previous studies mainly dealt with two-dimensional (2D) problems to simulate crack growth of rib-to-deck welded joints.…”

Section: Introductionmentioning

confidence: 99%

Fatigue crack growth behavior of rib-to-deck double-sided welded joints of orthotropic steel decks

Liu

Chen

Wang

et al. 2020

Advances in Structural Engineering

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Innovative double-sided welding is expected to improve the fatigue resistance of rib-to-deck welded joints of orthotropic steel decks (OSDs). Welding crack-like defects are the crucial issue affecting the fatigue performance of rib-to-deck double-sided welded joints. This study presents a numerical simulation of three-dimensional (3D) mixed mode fatigue crack growth behavior of rib-to-deck double-sided welded joints of OSDs. Maximum tensile stress theory and equivalent stress intensity factor (SIF) were used to simulate mixed mode fatigue cracks growth. The Paris law model was employed to predict the fatigue life. Fatigue cracks of rib-to-deck double-sided welded joints were characterized by the presence of mixed mode cracks of modes I (open), mode II (shear), and mode III (tear), which was dominated by mode I. The equivalent SIF was found to be complex at the growth stage with the maximum value at the two ends of the crack front and the minimum value at the midpoint of the crack front. The crack shape became flatter in the later phase of the crack growth. The fatigue crack surface underwent deflections during crack growth, making the final crack shape exhibiting the characteristic of a spatial curved surface. The initial crack geometry showed a significant impact on the fatigue life.

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Section: Introductionmentioning

confidence: 99%

Fatigue crack growth behavior of rib-to-deck double-sided welded joints of orthotropic steel decks

Liu

Chen

Wang

et al. 2020

Advances in Structural Engineering

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“…The inherent defects become insignificant even though they are getting really close to the crack tip. The cracking behavior does not appear to be influenced by neighboring porosities, presumably because their small size mainly less than 40 μm for the weld, as well as the rounded morphology with a mean sphericity of approximately 0.6 give rise to relatively small stress concentration degree around the long crack . The crack driving force is mainly dominated by the crack length at that moment.…”

Section: Resultsmentioning

confidence: 99%

“…The cracking behavior does not appear to be influenced by neighboring porosities, presumably because their small size mainly less than 40 μm for the weld, as well as the rounded morphology with a mean sphericity of approximately 0.6 give rise to relatively small stress concentration degree around the long crack. 9,28,32 The crack driving force is mainly dominated by the crack length at that moment. Porosity appears to have little influence on the stable growth rate, 30 as confirmed in Figure 11B.…”

Section: Fatigue Cracking Behaviormentioning

confidence: 99%

Effect of microstructural features on the failure behavior of hybrid laser welded AA7020

Song

et al. 2018

Fatigue Fract Eng Mat Struct

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Detailed investigations of microstructural feature, mechanical property, fatigue strength, and damage mechanism were conducted on hybrid laser welded 7020‐T651 aluminum alloys used into high‐speed railway vehicles. The results show that the hybrid laser welding process can induce significant changes of microstructures and alloying elements, together with numerous gas pores. Such local modifications degrade the fatigue performance. The tensile strength of welded joints was approximately 74% with respect to the base metal, thus satisfying the design standard. The fatigue property was determined in the low and high cycle regimes. It was found that the fatigue strength of welded joints was fairly inferior to that of the base metal, but far higher than the IIW recommended value. Furthermore, welding defects were well believed to contribute to the shorter fatigue life. The small fatigue crack growth presented highly discontinuous and inhomogeneous due to microstructure and porosity. By contrast, the crack stable growth stage was less sensitive to microstructural features of hybrid welded joints.

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“…The model consists of the frontal, parietal, occipital, and temporal bones, and they are connected with sutures. The model was analyzed with the extended FE method (X-FEM) [8][9][10], and a forming limit diagram (FLD) was embedded in the model. An FLD shows the probability of fracture occurrence with respect to the maximum and minimum strains.…”

Section: Introductionmentioning

confidence: 99%

Analysis of relationship between loading condition and cranial cracking pattern using a three-dimensional finite element model

Kiriyama

Sato

Muramatsu

et al. 2022

BMC Musculoskelet Disord

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Background A hairline crack on the cranium can occur even under a small external load or impact and are thus often observed in patients who have experienced an accidental fall or collision. Typical finite element analysis is useful to analyze the stress concentration or the propagation of stress waves. However, a stress propagation model does not accurately reproduce the features of hairline cracks on the cranium. The objective in this study was to reproduce cranial hairline cracks. Methods A three-dimensional finite element model of the cranial bone was developed from a patient CT images. The model consists of the frontal, parietal, occipital and temporal bones, and the bones are connected with the sutures. Additionally, the model comprised three layers; the external and internal tables and the diploe. The model was analyzed using the extended finite element method (X-FEM), and a forming limit diagram (FLD) was embedded in the model. In this study, the model was symmetrized bilaterally using the model developed from the left side of the skull. The FLD in this study was assumed to be a relationship between the maximum and minimum strains when a fracture occurs. A total of 13 typical loadings were applied to the model: loading points on the top, left, and back of the cranium were considered, and at each loading point, loads were applied with four or five different directions, namely perpendicular to the cranium and inclined in the anterior, posterior, superior, or inferior at an angle of 45∘. Results Under all loading conditions, many small cracks formed radially at the loading points. Moreover, some large cracks formed under the certain loading conditions. The crack shapes on the top and left side could be associated with the specific loading directions, whereas cracks on the back did not show distinguishing characteristics depending on the loading directions. The present model was reproduced anatomically and morphologically, and the results were similar to those obtained in previous cadaver experiments. Conclusions Through X-FEM analysis of the FE model embedded with an FLD, hairline cracks in the cranium were reproduced, and a few crack shapes were identified as potential markers for estimating the loading conditions.

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An XFEM based uncertainty study on crack growth in welded joints with defects

Cited by 31 publications

References 23 publications

Fatigue crack growth behavior of rib-to-deck double-sided welded joints of orthotropic steel decks

Fatigue crack growth behavior of rib-to-deck double-sided welded joints of orthotropic steel decks

Effect of microstructural features on the failure behavior of hybrid laser welded AA7020

Analysis of relationship between loading condition and cranial cracking pattern using a three-dimensional finite element model

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