Numerical analysis of the effect of pore on local stresses in spot welds

Bouafia, Farida; Sérier, B.; Boutabout, Bénali; Bouiadjra, B. Bachir

doi:10.1016/j.commatsci.2011.03.036

Cited by 6 publications

(7 citation statements)

References 3 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…To solve the problems of a pore and crack in a polygonal element, the elemental functional can be obtained according to the Hellinger‐Reissner principle as below

Π_{e}^{pore} = \int_{Ω} ([], \frac{1}{2} σ^{T} boldSσ - σ^{T} ((), Du)) dΩ - \int_{{normalΓ}_{1}} t^{T} ((), u^{(1)} - boldu) normald Γ_{1} + \int_{{normalΓ}_{2}} {\overset{true˜}{boldt}}^{T} boldu normald Γ_{2}

Π_{e}^{crack} = \int_{Ω} ([], \frac{1}{2} σ^{T} boldSσ - σ^{T} ((), Du)) dΩ - \int_{{normalΓ}_{1}} t^{T} ((), {\overset{true˜}{boldu}}^{(1)} - boldu) normald Γ_{1} + \int_{{normalΓ}_{2}} {\overset{true˜}{boldt}}^{T} boldu normald Γ_{2}

in which Π e pore and Π e crack represent the elemental functional due to pore in Figure A and due to crack in Figure B, respectively.…”

Section: Experiments and Simulationsmentioning

confidence: 99%

See 1 more Smart Citation

Fatigue behaviors of laser hybrid welded AA7020 due to defects via synchrotron X‐ray microtomography

Song

Ding³

et al. 2019

Fatigue Fract Eng Mat Struct

View full text Add to dashboard Cite

Defect or shrinkage is known to have a detrimental effect on the fatigue resistance of casting lightweight alloys and additively manufactured or 3D printed materials. However, very few works focus on the damage mechanism of fusion welded Al alloys due to gas pores or metallurgical defects. This paper performs an investigation on the effect of porosity on the damage evolution of laser hybrid welded 7020‐T651 alloys. The critical pore size comparable with average weld grain was assumed in terms of the population and dimension of micropores. To characterize the coupling effect between gas pores and cracks, an in situ fatigue testing rig was developed to well work at the synchrotron radiation tomography system. Combining synchrotron X‐ray microtomography and fatigue resistance testing, the pore size and location were correlated with the crack initiation and crack growth path but relatively less on the long crack propagation rate. Furthermore, the interaction between the porosity and stress concentration was elucidated by using finite element simulations, which shows that the gas pore appears to be a preferred cracking site especially near the surface.

show abstract

“…To solve the problems of a pore and crack in a polygonal element, the elemental functional can be obtained according to the Hellinger‐Reissner principle as below

Π_{e}^{pore} = \int_{Ω} ([], \frac{1}{2} σ^{T} boldSσ - σ^{T} ((), Du)) dΩ - \int_{{normalΓ}_{1}} t^{T} ((), u^{(1)} - boldu) normald Γ_{1} + \int_{{normalΓ}_{2}} {\overset{true˜}{boldt}}^{T} boldu normald Γ_{2}

Π_{e}^{crack} = \int_{Ω} ([], \frac{1}{2} σ^{T} boldSσ - σ^{T} ((), Du)) dΩ - \int_{{normalΓ}_{1}} t^{T} ((), {\overset{true˜}{boldu}}^{(1)} - boldu) normald Γ_{1} + \int_{{normalΓ}_{2}} {\overset{true˜}{boldt}}^{T} boldu normald Γ_{2}

in which Π e pore and Π e crack represent the elemental functional due to pore in Figure A and due to crack in Figure B, respectively.…”

Section: Experiments and Simulationsmentioning

confidence: 99%

“…To solve the problems of a pore and crack in a polygonal element, the elemental functional can be obtained according to the Hellinger-Reissner principle as below. 59 Π pore…”

Section: Fatigue Resistance With Poresmentioning

confidence: 99%

Fatigue behaviors of laser hybrid welded AA7020 due to defects via synchrotron X‐ray microtomography

Song

Ding³

et al. 2019

Fatigue Fract Eng Mat Struct

View full text Add to dashboard Cite

show abstract

“…The behavior of fractures started in the steel matrix and exposed to tensile stresses was examined using the ABAQUS computer code [6], which is based on the finite element approach. Our earlier work [15][16][17] had successfully used the finite element model, and more recent calculations [4,18,19] employing this model's mesh size convergence have validated this. Here, the key elements of the technique are explained.…”

Section: Finite Element Modelmentioning

confidence: 84%

Effect of Porosity Shape, Size and Distribution on Stress Intensity Factors in Spot Welded Joints: A Finite Element Study

Benala,

Zouambi,

Bouafia

et al. 2023

ACSM

View full text Add to dashboard Cite

In this study, the influence of porosity on crack initiation behavior in welded structures subjected to spot welding was investigated. Three-dimensional (3D) finite element analyses were conducted using the ABAQUS finite element software under mechanical stress. The stress intensity factors (SIF) in opening and moving modes were computed employing the finite element technique. A comprehensive analysis of various parameters, including mechanical load, crack size, porosity form, porosity size, porosity-crack interaction, and crack orientation, was carried out. This investigation was approached as a mixed-mode, plane stress, and linear elastic fracture mechanics problem with a focus on the passive voice. The results demonstrated that the stress intensity factor is not only dependent on the magnitude of the applied mechanical loading but also on factors such as crack size, porosity form, defect-defect interaction, and crack orientation. Additionally, it was observed that both the size and form of porosity play a significant role in influencing the stress intensity factors. This research contributes to the understanding of fracture mechanics in welded structures and provides valuable insights for enhancing the structural integrity and reliability of such systems.

show abstract

“…The effect of the interaction of two pores on the level of the internal stresses induced in the ferritic matrix in the center of the distance between two pores was studied by Bouafia et al [11]. Figure 10 presents the distribution of this stress and their intensity in the ferritic matrix and two pores for = 100 MPa.…”

Section: Effect Of Pore Densitymentioning

confidence: 98%

“…This behavior constitutes a damage risk of the weld joint. A very low stresses level does not present any risk of failure of the weld joint [11].…”

Section: Effect Of Pore Densitymentioning

confidence: 99%

Effect of Density and Pointed Corner Degree of Pore on Local Stress in Welded Structures: Defect in Marine Structures

Bouafia

Sérier

Serier

et al. 2014

ISRN Mechanical Engineering

Self Cite

View full text Add to dashboard Cite

The process of assembly by welding, in marine structures, led to the creation of microstructural heterogeneities zones. Welded structures generally contain defects such as lack of penetration, slag inclusion, porosity, and misalignment. Generally these zones can be discontinuities geometrical. At the origins of stress concentration, these regions are favourable sites where fatigue cracks can initiate and propagate. In this study, the 3D finite element method is used to analyze the distribution of stress (strain) generated by the presence in the weld nugget of a pore formed during the welding process. This analysis was made in the matrix-pore interface. The effects of density and pointed corner degree of pore on the stress levels were also analyzed.

show abstract

Numerical analysis of the effect of pore on local stresses in spot welds

Cited by 6 publications

References 3 publications

Fatigue behaviors of laser hybrid welded AA7020 due to defects via synchrotron X‐ray microtomography

Fatigue behaviors of laser hybrid welded AA7020 due to defects via synchrotron X‐ray microtomography

Effect of Porosity Shape, Size and Distribution on Stress Intensity Factors in Spot Welded Joints: A Finite Element Study

Effect of Density and Pointed Corner Degree of Pore on Local Stress in Welded Structures: Defect in Marine Structures

Contact Info

Product

Resources

About