Residual stresses of friction melt bonded aluminum/steel joints determined by neutron diffraction

Jimenez-Mena, Norberto; Sapanathan, Thaneshan; Drezet, Jean‐Marie; Pirling, Thilo; Jacques, Pascal; Simar, Aude

doi:10.1016/j.jmatprotec.2018.11.030

Cited by 13 publications

(5 citation statements)

References 16 publications

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“…With increasing distance from the joint, the stresses change to compressive which are significantly greater in a longitudinal direction contrary to transverse. The obtained values of residual stresses and their nature of changes are similar to those available in other publications [ 45 , 46 , 47 , 48 , 49 , 50 ]. In all cases, the residual stresses are the highest at the weld line and lower at the center of joints.…”

Section: Resultssupporting

confidence: 87%

Research on the Properties and Low Cycle Fatigue of Sc-Modified AA2519-T62 FSW Joint

et al. 2020

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The aim of this research was to examine the mechanical and fatigue properties of friction stir welded Sc-modified 5 mm thick AA2519-T62 extrusion. The joint was obtained using the following parameters: 800 rpm tool rotation speed, 100 mm/min tool traverse speed, 17 kN axial, and MX Triflute as a tool. The investigation has involved microstructure observations, microhardness distribution analysis, tensile test with digital image correlation technique, observations of the fracture surface, measurements of residual stresses, low cycle fatigue testing, and fractography. It was stated that the obtained weld is defect-free and has joint efficiency of 83%. The failure in the tensile test occurred at the boundary of the thermo-mechanically affected zone and stir zone on the advancing side of the weld. The residual stress measurements have revealed that the highest values of longitudinal stress are localized at the distance of 10 mm from the joint line with their values of 124 MPa (the retreating side) and 159 MPa (the advancing side). The results of low cycle fatigue testing have allowed establishing of the values of the cyclic strength coefficient (k′ = 504.37 MPa) and cyclic strain hardening exponent (n′ = 0.0068) as well as the factors of the Manson–Coffin–Basquin equation: the fatigue strength coefficient σ′f = 462.4 MPa, the fatigue strength exponent b = −0.066, the fatigue ductility coefficient ε′f = 0.4212, and the fatigue ductility exponent c = −0.911.

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Section: Resultssupporting

confidence: 87%

Research on the Properties and Low Cycle Fatigue of Sc-Modified AA2519-T62 FSW Joint

et al. 2020

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“…Another relevant contribute was presented by Peel et al [17], who used X-ray measurements to achieve the residual stress field in friction stir welded aluminum sheets at the different tool transverse speed. Similar studies were carried out by Staron et al [18] and Jimenez-Mena et al [19]. Another popular method for measurement of residual stresses is Hole-drilling method which is a seminondestructive mechanical technique for evaluation of magnitude, distribution and direction of residual stresses around the welding line.…”

Section: Introductionmentioning

confidence: 55%

Effect of friction stir welding parameters on the residual stress distribution of Al-2024-T6 alloy

Farhang¹,

Sam-Daliri²,

Farahani³

et al. 2021

JMES

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The objective of this study was to investigate the influences of the main parameters of friction stir welding (FSW) on the residual stresses remained in the FSW of Al 2024-T6. The main parameters were tool rotational speed and tool transverse speed. The effect of these parameters on the residual stresses was studied in both finite element simulation and hole drilling strain gauge measurement. The results showed a good agreement between the numerical results and the experimental outcomes. The change in transverse speed from 25 to 31.5 mm/min resulted in increase of longitudinal residual stresses in welding centerline in which the longitudinal residual stress was increased at the tool rotational speed of 1120 rpm and 1600 rpm about 12.5% and 2.67%, respectively. The results showed that at the low rotational speed, the strain rate had the most effect on the residual stresses whereas at the high rotational speed, some residual stress was released due to the generated heat in the weld zone.

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“…where F and I are deformation gradient and identity tensor, respectively. Once Murnaghan's strain energy function is determined, the second Piola-Kirchhoff stress in the local coordinate system is obtained by equation (9). Utilizing the Jacobian of the deformation gradient denoted as J = det (F)…”

Section: Finite Element Modelingmentioning

confidence: 99%

“…However, these methods are unsuitable for measuring thermal stress in perfectly constrained metallic plates since strain variations in such plates are absent. Besides strain-based methods, other established nondestructive techniques are adopted to measure stress, including piezospectroscopy [5,6], x-ray diffraction, and neutron diffraction [7][8][9][10]. Although these methods provide nondestructive and noncontact measurements, they have notable limitations.…”

Section: Introductionmentioning

confidence: 99%

Thermal stress estimation of a constrained metallic plate using symmetric and antisymmetric Lamb wave group velocities

Azad,

Kang,

Lee

et al. 2024

Smart Mater. Struct.

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This paper presents a novel technique for estimating thermal-induced stress in constrained metallic plates using the group velocity of Lamb waves, the accuracy of which is crucial for assessing the structural integrity and serviceability of metallic structures. However, without the ability to gauge the current stress levels, obtaining such measurements is technically challenging. To overcome this, we propose a thermal stress estimation technique that uses changes in the group velocities of the fundamental symmetric (S0) and antisymmetric (A0) Lamb wave modes caused by thermal and stress variations. First, this study introduces a theoretical-based zero-crossing algorithm to measure the group velocities of S0 and A0 Lamb wave modes. Next, leveraging the acoustoelastic coefficients corresponding to the S0 and A0 modes, which are determined before the plate’s installation, this study generates the lines depicting the changes in group velocity induced by temperature variations (CT) for both the S0 and A0 modes. These CT lines are derived from the lines illustrating changes in group velocity due to thermal stress variations (CTS), which are obtained after plate installation. Ultimately, the generated CT lines can be used to estimate thermal stress throughout the entirety of the plate’s operational life span by isolating the distinct stress variation effects from the CTS lines. The numerical validation results show favorable accuracy in thermal stress estimation in a constrained plate subjected to temperature variation using both S0 and A0 Lamb wave modes, with average errors of 0.63% and 0.91%, respectively.

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Residual stresses of friction melt bonded aluminum/steel joints determined by neutron diffraction

Cited by 13 publications

References 16 publications

Research on the Properties and Low Cycle Fatigue of Sc-Modified AA2519-T62 FSW Joint

Research on the Properties and Low Cycle Fatigue of Sc-Modified AA2519-T62 FSW Joint

Effect of friction stir welding parameters on the residual stress distribution of Al-2024-T6 alloy

Thermal stress estimation of a constrained metallic plate using symmetric and antisymmetric Lamb wave group velocities

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