Numerical simulation of residual stress modification by reverse bending of notched fracture toughness test specimens of multipass welds

Mikami, Yoshiki; Kawabata, Tomoya; Tagawa, Tetsuya; Kitano, Hiroshi; Kiuchi, Akira; Kayamori, Yoichi; Kanna, Sohei; Sakurai, Tsuyoshi; Imai, Yasuhito; Ohata, Mitsuru; Mochizuki, Masahito; Minami, Fumiyoshi; Aihara, Shuji; Hagihara, Yukito

doi:10.1016/j.tafmec.2017.07.025

Cited by 13 publications

(2 citation statements)

References 6 publications

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“…Uncontrollable-welding deformation will also lead to complex straightening processes and expensive subsequent machining costs. Based on this, many scholars use professional welding simulation software to improve the quality and performance of welded components and optimize the welding process [19,20]. Yang reviewed recent advances in mitigation techniques that have been applied in the structural design, manufacturing, and postweld stages and analyzed the residual stress relief method of each stage [21,22].…”

Section: Introductionmentioning

confidence: 99%

Numerical Simulation and Test Study on Track Welding of QTT

et al. 2023

Advances in Astronomy

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Considering the stringent requirement of the pointing accuracy up to 2.5″ of the world’s largest full steerable radio telescope, this paper studies the welding experiment of the azimuth track of the antenna. First, the opposite deformation jig and welding process were designed for the QTT’s azimuth track. Then, the welding process was numerically simulated using a finite element model. The simulation results show that a better welding effect will be obtained by appropriately reducing the opposite force on the basis of the original. The three deformation processes of the track are regulated by the opposite deformation jig. The results show that the opposite deformation jig designed for QTT’s azimuth track can make the amount of deformation and flatness meet the design requirements. Finally, nondestructive testing was carried out to check the welding quality of the track surface and interior. The results show that there are no obvious defects in the welds of the azimuth track. The constraint jig and welding processes designed for QTT are effective and feasible.

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Section: Introductionmentioning

confidence: 99%

Numerical Simulation and Test Study on Track Welding of QTT

et al. 2023

Advances in Astronomy

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“…Chenxi Ding et al found that, as the notch curvature decreases, both the peak value of the dynamic stress intensity factor and the corresponding peak value of the propagation velocity of the crack tip increase significantly after the initiation [22]. With the development of computer simulation technology, numerical simulation is an important method to solve the stress analysis in notched structure [23][24][25]. e authors in [26] studied the effects of U-shaped, V-shaped, and I-shaped notches on the deformation mechanism of metal materials under impact loading by comprehensively using model experiments and numerical simulations.…”

Section: Introductionmentioning

confidence: 99%

Experimental Study on the Caustics of Moving Cracks and Elliptical Curvature under Impact Loading

Luo

Yang

Wang

et al. 2021

Advances in Civil Engineering

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A dynamic caustics test system was used, and different moving cracks were analysed to study the interaction between the crack growth rate, stress intensity factor, and curvature of the elliptical end of a moving crack under impact loading. Based on the linear elastic fracture mechanics theory, linearly fitting of the crack tip stress intensity factor and the elliptical curvature were employed to obtain the specific functional expressions. ABAQUS software was used to numerically simulate the moving crack fracture process passing through different elliptical curvatures. The crack tip stress intensity factor was calculated by the stress extrapolation method. The stress intensity factor obtained from the numerical calculation and the caustics test was consistent. The test and numerical simulation results showed that the direction of moving cracks entering and passing through the elliptical defects shows a certain regularity. As the ellipse curvature increased, the moving crack stress intensity factor passing through the ellipse gradually decreased, and the moving crack also passed easily through oval defects.

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