Effect of Yield Strength Distribution Welded Joint on Crack Propagation Path and Crack Mechanical Tip Field

Bi, Yueqi; Yuan, Xiaoming; Lv, Jishuang; Bashir, Rehmat; Wang, Shuai; Xue, He

doi:10.3390/ma14174947

Cited by 14 publications

(7 citation statements)

References 31 publications

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“…However, it has been difficult to perform microscopic analyses to provide intuitive conclusions regarding fatigue performance. Thus, an increasing number of studies have focused on the analysis of influencing factors, including the impact of initial defect geometry, crack location, and yield strength distribution, on the growth path and fatigue performance [11][12][13][14][15]. Furthermore, targeted fatigue life assessment models have been developed for welded joints.…”

Section: Introductionmentioning

confidence: 99%

Crack extension analysis and fatigue life assessment of single lug and yoke joints containing initial defects

Duan

Cheng

et al. 2022

Mater. Res. Express

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To investigate the impact of initial cracks on the fatigue performance of single lug and yoke joints, fatigue testing was performed for defective welding joint models. The crack extension behaviors were investigated based on the theories of fracture mechanics using ANSYS-FRANC3D interactive technology, and the effects of the initial crack location, morphology pattern, and surface angle on fatigue performance were determined. The results showed a fatigue failure mode in which the crack extended along the welding line for single lug and yoke joints. The fatigue life was shorter when the initial crack was in the corner of the single lug plate. Moreover, the crack growth rates during the early stage of crack extension varied significantly with different initial crack morphology patterns. However, the crack growth rates during the later stages were similar to one another. The remaining fatigue life increased with the shape ratio for the same crack depth. Finally, the crack growth rate was the fastest, and the remaining fatigue life was the shortest when the initial crack surface angle was inclined toward the stress concentration area.

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Section: Introductionmentioning

confidence: 99%

Crack extension analysis and fatigue life assessment of single lug and yoke joints containing initial defects

Duan

Cheng

et al. 2022

Mater. Res. Express

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“…Xue et al [ 29 ] used the user-defined material (UMAT) subroutine and user-defined field variable (USDFLD) subroutine methods to make up for the shortcomings of the sandwich welded joints finite element model, and the analysis results show that the UMAT subroutine can characterize the non-uniformity of mechanical properties of welded joints well. In our previous research [ 30 ], the continuous change model of material yield strength is established by the USDFLD subroutine in ABAQUS 6.14 software. This method has the advantage of accurately characterizing the continuous change of mechanical properties of welded joint materials and eliminating the discontinuity of the mechanical field in the sandwich structure finite element model.…”

Section: Introductionmentioning

confidence: 99%

Numerical Investigation of the Influence of Ultimate-Strength Heterogeneity on Crack Propagation and Fracture Toughness in Welded Joints

Bi¹,

Yuan

Hao³

et al. 2022

Materials

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The mechanical properties of dissimilar metal-welded joint materials are heterogeneous, which is an obstacle to the safety evaluation of key welded structures. The variation of stress–strain conditions at the crack tip caused by mismatch of material mechanical properties in dissimilar metal-welded joints is an important factor affecting crack propagation behavior. To understand the influence of uneven distribution of ultimate strength of the base metal and the welded metal on the crack propagation path, fracture toughness, as well as the mechanical field at the crack tip in the small-scale yield range, the user-defined field variable subroutine method is used to express continuous variation characteristics of welded joint ultimate strength in finite element software. In addition, the J-integral during crack propagation is calculated, and the effect of the ultimate strength on the J-integral and the stress field at the crack tip are analyzed. The results show that as the crack propagation direction is perpendicular to the direction of ultimate strength, the gradient of ultimate strength increases from |Gy|= 50 to |Gy|= 100 MPa/mm, the crack deflection angle increases by 0.018%, and the crack length increases by 1.46%. The fracture toughness of the material decreased slightly during crack propagation. Under the condition that the crack propagation direction is the same as the direction of ultimate strength, the crack propagation path is a straight line. As the gradient of ultimate strength increases from Gx = 50 to Gx = 100 MPa/mm, the crack propagation length decreases by 5.17%, and the slope of fracture toughness curve increases by 51.63%. On the contrary, as the crack propagates to the low ultimate strength side, the crack propagation resistance decreases, the ultimate strength gradient increases from Gx = −100 to Gx = −50 MPa/mm, and the slope of the fracture toughness curve decreases by 51.01%. It is suggested to consider the relationship between crack growth behavior and ultimate strength when designing and evaluating the structural integrity of cracks at the material interface of dissimilar metal-welded joints.

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“…Using the USDFLD subroutine, the mechanical properties of materials can be introduced into the parameters dependent on spatial coordinate variables, which can be used to simulate the uneven material of welded joints. In our previous research, we discussed the crack growth path and crack tip mechanical field during crack propagation that affected yield strength mismatch using the USDFLD subroutine [23].…”

Section: Introductionmentioning

confidence: 99%

Characterization of Crack Tip Mechanical Field of Inhomogeneous Materials in Welded Joints by USDFLD Subroutine

Yuan

Hao

et al. 2022

Advances in Materials Science and Engineering

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The unevenly distributed mechanical properties of welded joints are one of the important factors, which affect welded joints’ safety seriously. The user-defined field (USDFLD) subroutine in ABAQUS finite element software can introduce variable-dependent material properties. This method can define inhomogeneous materials whose mechanical parameters depend on spatial coordinates and can be used to characterize the uneven mechanical properties of heat-affected zone and fusion zone. By establishing the static crack finite element model of welded joint with continuous change in yield strength, the sudden change in mechanical field in the numerical simulation process of sandwich structure model is eliminated. Compared with the existing numerical simulation methods of local mechanical heterogeneity of welded joints, this method provides a method to realize the structural integrity evaluation of welded joints.

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Effect of Yield Strength Distribution Welded Joint on Crack Propagation Path and Crack Mechanical Tip Field

Cited by 14 publications

References 31 publications

Crack extension analysis and fatigue life assessment of single lug and yoke joints containing initial defects

Crack extension analysis and fatigue life assessment of single lug and yoke joints containing initial defects

Numerical Investigation of the Influence of Ultimate-Strength Heterogeneity on Crack Propagation and Fracture Toughness in Welded Joints

Characterization of Crack Tip Mechanical Field of Inhomogeneous Materials in Welded Joints by USDFLD Subroutine

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