Weld residual stresses in a thick plate considering back chipping: Neutron diffraction, contour method and finite element simulation study

Wan, Yu; Jiang, Wenchun; Li, Jian; Sun, Guangai; Kim, Dong Kyu; Woo, Wanchuck; Tu, Shan‐Tung

doi:10.1016/j.msea.2017.05.079

Cited by 55 publications

(17 citation statements)

References 29 publications

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“…Considering the effect of weld residual stress and the mechanical mean stress, the Goodman equation is used, as shown in the following:

where σ a is the stress amplitude, σ a( R =−1) is the stress amplitude with a stress ratio R equal to −1, σ m is the mean stress, and σ b is the ultimate tensile strength. At the heat-affected zone, i.e., the potential fatigue crack initiation site, the magnitude of residual stress is close to the yield strength [ 30 ]. Therefore, the mean stress is taken as the combination of the yield strength and the mean stress of the elastic stress analysis.…”

Section: Resultsmentioning

confidence: 99%

Fatigue Life Assessment of the Shell Structure of Purified Terephthalic Acid Filter Press

et al. 2020

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The filter press is one of the most important devices in purified terephthalic acid (PTA) refinement, and it is of great significance to ensure the fatigue strength of the structure in operation. In this study, the fatigue life prediction of the shell structure of the PTA filter press was investigated through numerical and experimental methods. Firstly, the accurate stress at the critical area of the stiffener was obtained based on the thermomechanical model and submodel approach proposed. Subsequently, the fatigue life was evaluated by the fatigue strength reduction method and hot spot stress method. Finally, the shell structure is optimized by increasing the size of the axial stiffener and continuous hoop stiffener. The results unveil that both thermal load and outer structure constraints have little effect on the radial displacement and stress amplitude of the shell structure. Through modifying the fatigue design curve of the fatigue strength reduction method, the shell structure of the PTA filter press has 42.0% and 0.3% failure probabilities in the previous and present cyclic pressure conditions. Furthermore, the hoop stiffener plays an important role in reducing radial displacement and stress amplitude, among which three hoop stiffeners exhibit the most satisfactory optimization.

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“…Considering the effect of weld residual stress and the mechanical mean stress, the Goodman equation is used, as shown in the following:

Section: Resultsmentioning

confidence: 99%

Fatigue Life Assessment of the Shell Structure of Purified Terephthalic Acid Filter Press

et al. 2020

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“…The impact indentation measurement was carried out according to China National Standard GB/T 24179-2009. It can be assumed that the principal stresses are parallel and normal to the welding direction, namely longitudinal and transverse stress, which can be calculated as Equations (5) and (6) [28]:…”

Section: Indentation Strain Measurement Of Residual Stressmentioning

confidence: 99%

“…However, welding residual stresses are inevitably generated due to the nonuniform temperature distribution during repair welding. The existence of tensile residual stresses can especially decrease the load capacity and fatigue life, and increase the risk of stress corrosion cracking [4,5]. Therefore, it is significant to ensure the safety of welding structures by decreasing the harmful tensile residual stresses and to appropriately generate beneficial compressive residual stresses.…”

Section: Introductionmentioning

confidence: 99%

Experimental and Numerical Simulation to Study the Reduction of Welding Residual Stress by Ultrasonic Impact Treatment

et al. 2020

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In this study, the effects of ultrasonic impact treatment (UIT) on the residual stress in a repair welding joint are investigated by experimental and finite element methods. A three-dimensional numerical analysis approach including a thermomechanical-coupled welding simulation and dynamic elastic-plastic UIT simulation is developed, which has been validated by X-ray diffraction measurement and indentation strain method. The results show that longitudinal residual stresses basically turned into the small tensile stress state from the large tensile stress state, and transverse residual stresses have mainly turned into compressive stresses from large tensile stress after the UIT. In the thickness direction, the average decrease of longitudinal residual stress is 259.9 MPa, which is larger than the 149.1 MPa of transverse residual stress. The calculated residual stress distribution after the UIT of the thin plate is compared with that of the thick plate in the literature, with the results showing the stress accumulation layer inside the thick plate. The simulation results show that the elastic strains are decreased slightly and the equivalent plastic strain is increased markedly after UIT, which explains the mechanism of residual stress relaxation.

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“…The finite element modeling (FEM) is a good method for clarifying the effects of heat input on the weld pool and maximum welding temperature before welding trail [35][36][37][38]. Jiang et al [39][40][41][42][43][44][45][46][47][48] made a larger number of investigations of welding residual stress by FEM, and some key method of reducing residual stresses are obtained.…”

Section: Introductionmentioning

confidence: 99%

A Study on Microstructure, Residual Stresses and Stress Corrosion Cracking of Repair Welding on 304 Stainless Steel: Part I-Effects of Heat Input

Luo

Peng

et al. 2020

Materials

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In this paper, the effect of repair welding heat input on microstructure, residual stresses, and stress corrosion cracking (SCC) sensitivity were investigated by simulation and experiment. The results show that heat input influences the microstructure, residual stresses, and SCC behavior. With the increase of heat input, both the δ-ferrite in weld and the average grain width decrease slightly, while the austenite grain size in the heat affected zone (HAZ) is slightly increased. The predicted repair welding residual stresses by simulation have good agreement with that by X-ray diffraction (XRD). The transverse residual stresses in the weld and HAZ are gradually decreased as the increases of heat input. The higher heat input can enhance the tensile strength and elongation of repaired joint. When the heat input was increased by 33%, the SCC sensitivity index was decreased by more than 60%. The macroscopic cracks are easily generated in HAZ for the smaller heat input, leading to the smaller tensile strength and elongation. The larger heat input is recommended in the repair welding in 304 stainless steel.

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Weld residual stresses in a thick plate considering back chipping: Neutron diffraction, contour method and finite element simulation study

Cited by 55 publications

References 29 publications

Fatigue Life Assessment of the Shell Structure of Purified Terephthalic Acid Filter Press

Fatigue Life Assessment of the Shell Structure of Purified Terephthalic Acid Filter Press

Experimental and Numerical Simulation to Study the Reduction of Welding Residual Stress by Ultrasonic Impact Treatment

A Study on Microstructure, Residual Stresses and Stress Corrosion Cracking of Repair Welding on 304 Stainless Steel: Part I-Effects of Heat Input

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