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Finite Element Modeling of Ultrasonic Nanocrystalline Surface Modification Process of Alloy 718
As one of the emerging surface treatment technologies, ultrasonic nanocrystal surface modification (UNSM) tends to generate a plastic hardening layer to modify the mechanical and tribological properties of the workpiece near the surface. Among other surface modification methods, the lifting of mechanical performance near-surface region is mainly attributed to the presence of severe plastic deformation (SP2D). Thus, a more gradient distribution of residual stress is also introduced along the working process. The most notable advantage of UNSM technology is to make the surface optimization results precisely controllable through input parameters adjusting. Although the process and optimization results of UNSM on metals have been extensively studied experimentally, there are few studies on the effect of parameters on surface modification characteristics. This is due to the difficulty of conducting experiments to investigate the influence mechanism of the parameters and the procedure is costly and time-consuming. Nevertheless, this greatly limits the specific application studies of UNSM-treated specimens, such as accurate modeling before wear and fatigue testing, etc. In this work, a dynamic process of UNSM is built based on the finite element method (FEM). A displacement-controlled tip ball is modeled to simulate ultrasonic striking behaviors and a single-way process extracted from UNSM has been parametrically investigated carefully. The experimental data is used to verify and corroborate the FE results and it shows a good agreement. The depth and maximum value of residual stress are measured in the post-processing stage. As a result, the numerical results show that the UNSM-treated specimen exhibits a higher gradient of residual stress and plastic strain than its substrate.
Finite Element Modeling of Ultrasonic Nanocrystalline Surface Modification Process of Alloy 718
As one of the emerging surface treatment technologies, ultrasonic nanocrystal surface modification (UNSM) tends to generate a plastic hardening layer to modify the mechanical and tribological properties of the workpiece near the surface. Among other surface modification methods, the lifting of mechanical performance near-surface region is mainly attributed to the presence of severe plastic deformation (SP2D). Thus, a more gradient distribution of residual stress is also introduced along the working process. The most notable advantage of UNSM technology is to make the surface optimization results precisely controllable through input parameters adjusting. Although the process and optimization results of UNSM on metals have been extensively studied experimentally, there are few studies on the effect of parameters on surface modification characteristics. This is due to the difficulty of conducting experiments to investigate the influence mechanism of the parameters and the procedure is costly and time-consuming. Nevertheless, this greatly limits the specific application studies of UNSM-treated specimens, such as accurate modeling before wear and fatigue testing, etc. In this work, a dynamic process of UNSM is built based on the finite element method (FEM). A displacement-controlled tip ball is modeled to simulate ultrasonic striking behaviors and a single-way process extracted from UNSM has been parametrically investigated carefully. The experimental data is used to verify and corroborate the FE results and it shows a good agreement. The depth and maximum value of residual stress are measured in the post-processing stage. As a result, the numerical results show that the UNSM-treated specimen exhibits a higher gradient of residual stress and plastic strain than its substrate.
Finite Element Modeling of Ultrasonic Nanocrystalline Surface Modification Process of Alloy 718
Lect.Notes Mechanical Engineering
Abdel Wahab, Magd (Herausgeber:in) / Li, Chao (Autor:in) / Karimbaev, Ruslan (Autor:in) / Amanov, Auezhan (Autor:in) / Abdel Wahab, Magd (Autor:in)
Proceedings of the 5th International Conference on Numerical Modelling in Engineering ; Kapitel: 10 ; 125-135
20.04.2023
11 pages
Aufsatz/Kapitel (Buch)
Elektronische Ressource
Englisch
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