Numerical simulation of residual stresses fields of DD6 blade during laser shock processing

Fang, Yingwu; Li, Yinghong; He, Weifeng; Lü, Yanjun; Li, Pengyang

doi:10.1016/j.matdes.2012.06.052

Cited by 30 publications

(6 citation statements)

References 21 publications

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“…Apparently, both the amplitude and depth of the compressive residual stress increased and tended to saturation when I 0 increased to its threshold. The similar phenomenon has already been reported by Fang et al [26]. A distinct improvement of residual stress can be acquired when I 0 increased to 7.6 GW cm −2 .…”

Section: Influence Of Laser Parameters On Residual Stress Evolutionsupporting

confidence: 89%

Effect of laser shock processing on residual stress evolution in martensitic stainless steel multi-pass butt-welded joints

Guo²,

Guo³

et al. 2023

Mater. Res. Express

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Laser shock processing (LSP) is an innovative approach, which effectively improves the mechanical behavior of metallic structures by introducing compressive residual stress. To evaluate the residual stress evolution in low-carbon 13Cr4Ni martensitic stainless steel multi-pass butt-welded joints induced by LSP, a two-step numerical simulation including welding analysis, at first, followed by LSP calculation with the simulated welding stress results being taken into account, was performed based on ABAQUS software. Effects of LSP parameters such as power density, spot size, overlapping rate and numbers of laser shock on the residual stress variations, were systematically investigated. To validate the reliability and accuracy of the numerical simulation, experiments of welding and LSP were conducted in sequence. The residual stress after welding and LSP were investigated by X-ray diffraction method. Results demonstrate that the simulated results show a good agreement with the experimental datas. The welding residual stress distribution is uneven. Larger tensile stresses appear on the weld surface and its adjacent heat-affected zone, which could be converted into high-level compressive stress after LSP. Furthermore, an ideal residual stress field can be obtained after two successive laser shocks with an overlap rate of 75% when the power density, spot diameter, and pulse width are 7.6 GW/cm2, 4 mm, and 25 ns, respectively.

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Section: Influence Of Laser Parameters On Residual Stress Evolutionsupporting

confidence: 89%

Effect of laser shock processing on residual stress evolution in martensitic stainless steel multi-pass butt-welded joints

Guo²,

Guo³

et al. 2023

Mater. Res. Express

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show abstract

“…The integrity of single crystal is a major index for the production of single crystal (SX) blades. Stray grain is a usual defect, which is a focal point of simulation studies [ 23 – 28 ].…”

Section: Introductionmentioning

confidence: 99%

Numerical Simulation and Optimization of Directional Solidification Process of Single Crystal Superalloy Casting

Zhang

Liu

2014

Materials

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The rapid development of numerical modeling techniques has led to more accurate results in modeling metal solidification processes. In this study, the cellular automaton-finite difference (CA-FD) method was used to simulate the directional solidification (DS) process of single crystal (SX) superalloy blade samples. Experiments were carried out to validate the simulation results. Meanwhile, an intelligent model based on fuzzy control theory was built to optimize the complicate DS process. Several key parameters, such as mushy zone width and temperature difference at the cast-mold interface, were recognized as the input variables. The input variables were functioned with the multivariable fuzzy rule to get the output adjustment of withdrawal rate (v) (a key technological parameter). The multivariable fuzzy rule was built, based on the structure feature of casting, such as the relationship between section area, and the delay time of the temperature change response by changing v, and the professional experience of the operator as well. Then, the fuzzy controlling model coupled with CA-FD method could be used to optimize v in real-time during the manufacturing process. The optimized process was proven to be more flexible and adaptive for a steady and stray-grain free DS process.

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“…LSP can produce sufficient residual compressive stress layers and remarkably improve the fatigue performance of the workpiece [11]. Furthermore, LSP has a simple operation, local treatment, and short processing duration [12]. However, it is a relatively expensive surface treatment method and has a complicated working environment [13].…”

Section: Introductionmentioning

confidence: 99%

Two-sided ultrasonic surface rolling process of aeroengine blades based on on-machine noncontact measurement

et al. 2020

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As crucial parts of an aeroengine, blades are vulnerable to damage from long-term operation in harsh environments. The ultrasonic surface rolling process (USRP) is a novel surface treatment technique that can highly improve the mechanical behavior of blades. During secondary machining, the nominal blade model cannot be used for secondary machining path generation due to the deviation between the actual and nominal blades. The clamping error of the blade also affects the precision of secondary machining. This study presents a two-sided USRP (TS-USRP) machining for aeroengine blades on the basis of on-machine noncontact measurement. First, a TS-USRP machining system for blade is developed. Second, a 3D scanning system is used to obtain the point cloud of the blade, and a series of point cloud processing steps is performed. A local point cloud automatic extraction algorithm is introduced to extract the point cloud of the strengthened region of the blade. Then, the tool path is designed on the basis of the extracted point cloud. Finally, an experiment is conducted on an actual blade, with results showing that the proposed method is effective and efficient.

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Numerical simulation of residual stresses fields of DD6 blade during laser shock processing

Cited by 30 publications

References 21 publications

Effect of laser shock processing on residual stress evolution in martensitic stainless steel multi-pass butt-welded joints

Effect of laser shock processing on residual stress evolution in martensitic stainless steel multi-pass butt-welded joints

Numerical Simulation and Optimization of Directional Solidification Process of Single Crystal Superalloy Casting

Two-sided ultrasonic surface rolling process of aeroengine blades based on on-machine noncontact measurement

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