Simulation of Ti-6Al-4V cruciform welded joints subjected to fatigue load using XFEM

Vempati, Srinivasa Reddy; Raju, K.; Subbaiah, K. Venkata

doi:10.15282/jmes.13.3.2019.11.0437

Cited by 10 publications

(6 citation statements)

References 11 publications

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“…It should be noted that the fracture patterns depend highly on the mesh size according to the literature [25,26]. Then, it is necessary to refine the mesh size in order to improve the breakthrough initiation points and to introduce the XFEM method in order to correctly predict the rupture propagation paths after initiation [27]. The proposed micromechanical model is limited only to estimating the fracture initiation points.…”

Section: Discussionmentioning

confidence: 99%

Micromechanical modeling of ductile fracture of human humerus

Rahmoun¹,

Naceur²,

Drazétic³

et al. 2020

JMES

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This paper deals with the formulation, development and validation of a newly developed micromechanical-based model for the modeling of the nonlinear ductile fracture of human humerus. The originality of the present works concerns the coupling between the micromechanical formulation based on the Mori-Tanaka homogenization scheme for cylindrical voids and the Marigo nonlinear ductile damage model based on the porosity growth. The proposed model was implemented as a User Material UMAT within the explicit dynamic software LS-DYNA and validated by numerical and experimental analysis conducted by a drop tower impact of human humerus. The outcome of the proposed multi-scale model appears to correctly predict the general trends observed experimentally via the good estimation of the ultimate impact load and the fracture patterns of the human humerus.

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Section: Discussionmentioning

confidence: 99%

Micromechanical modeling of ductile fracture of human humerus

Rahmoun¹,

Naceur²,

Drazétic³

et al. 2020

JMES

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“…A Zwick universal testing machine is used at CAN company to perform the different tests, imposing different stress or force ratios to reproduce the different loading paths of the FLD, as represented in Figure 5. For applying the load on flat plates or cruciform specimen in two different directions, this type of machine is required [36]. The type of load is applied in compression or tension-type.…”

Section: Experimental Procedures For Determination Of Fld Using Multi-axial Tensile Testsmentioning

confidence: 99%

Experimental and numerical FEM-based determinations of forming limit diagrams of St14 mild steel based on Marciniak-Kuczynski model

Mianroodi¹,

Altmeyer²,

Touchal³

2019

JMES

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Forming Limit Diagrams (FLD) are used to design metal sheet processes and to choose appropriate material according to their formability. Development of simple and robust methods to determine the formability domain is then a major industrial issue. Marciniak-Kuczynski (M-K) plastic instability criterion is a classical and common approach used to predict numerical FLD. A convergence of the experimental conditions and theoretical M-K hypotheses is investigated. This analysis leads in the proposition of a simple experimental procedure based on classical instrumented biaxial testing machines to reproduce M-K in-plane loading conditions. Experimental results are compared with numerical simulations based on a finite element method implantation of M-K model. This versatile implementation allows the coupling of the plastic instability criterion in ABAQUS with a large range of material behaviors. Application of these experimental and numerical procedures on commercial St14 mild steel leads to the relative differences between lower experimental points and numerical forming limits predictions that do not exceed 4% and 10% in the case of uniaxial and equibiaxial tension for initial prescribed defect ratio of 0.99 and 0.95, and 22% in the case of plane tension. These procedures constitute ways easily implementable in the industry to obtain FLD at reduced costs that show good correlations between experimental results and numerical M-K predictions.

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“…They conducted their experimental tests on specimens with residual stresses, which were induced by cold expansion. Vempati et al [8] studied the fatigue life of Ti-6Al-4V cruciform welded joints using XFEM. They investigated welded joints with various weld shapes and sizes to estimate the fatigue life of joints.…”

Section: Introductionmentioning

confidence: 99%

The study on the influences of residual stresses on fatigue crack propagation in titanium alloy specimens

Zangeneh

Sattari-Far

Noghabi

2022

JMES

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Fatigue crack growth is a harmful physical phenomenon in engineering materials that can be intensified by the presence of tensile residual stresses. In the present study, the effect of tensile residual stresses on the fatigue crack growth in single-edge notched bending specimens of Ti- 6Al-4V is studied. Mechanical residual stresses were created by applying a 4-point bending process. The residual stresses were evaluated utilizing the hole drilling approach under the ASTM E-837 standard. Fatigue crack propagation was measured by experimental test in specimens with and without initial residual stresses. A finite element analysis was conducted using commercial finite element software to study the plastic zone at the crack tip and fracture mechanic parameters. It was observed that the residual stress field is redistributed after each step of crack propagation. The tensile residual stress in front of the crack tip decreased from near yield strength to approximately 30% of yield strength. The tensile residual stresses near the yield strength in Ti-6Al-4V increased the fatigue crack propagation rate by approximately 50%.

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Simulation of Ti-6Al-4V cruciform welded joints subjected to fatigue load using XFEM

Cited by 10 publications

References 11 publications

Micromechanical modeling of ductile fracture of human humerus

Micromechanical modeling of ductile fracture of human humerus

Experimental and numerical FEM-based determinations of forming limit diagrams of St14 mild steel based on Marciniak-Kuczynski model

The study on the influences of residual stresses on fatigue crack propagation in titanium alloy specimens

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