An improved SPH for simulating SLM process with recoil pressure

IF 7.1 1区工程技术 Q1 ENGINEERING, MECHANICAL

International Journal of Mechanical Sciences Pub Date : 2025-02-20 DOI:10.1016/j.ijmecsci.2025.110060

Ting Long , Keyan Ning

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引用次数: 0

Abstract

The numerical simulation can predict and analyze the physical phenomena in the selective laser melting (SLM) process, providing reference for the selection of SLM process parameters. The smoothed particle hydrodynamics (SPH) method with high fidelity numerical simulation can be used as a tool to further study the SLM process. In this paper, an improved SPH method is proposed to simulate the molten pool flow in SLM process with recoil pressure caused by metal evaporation. In the improved SPH model, an improved kernel gradient correction (KGC) technique and an improved surface tension model are used to improve the computational accuracy, and a novel heat source applying method is proposed to improve the accuracy of applying the heat source model, and an improved material model are proposed to consider the process of metal evaporation. In the present heat source applying method, an improved method for determining the surface SPH particles interacting with laser is developed and a new ray reflection model is proposed to improve the accuracy of applying the heat source. And the recoil pressure model is applied to model the recoil pressure. The accuracy and effectiveness of the SPH model to simulate SLM process are verified by a series of numerical examples. The results show that the improved SPH model is effective in modeling the molten pool flow under recoil pressure.

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来源期刊

International Journal of Mechanical Sciences 工程技术-工程：机械

CiteScore

12.80

自引率

17.80%

发文量

769

审稿时长

19 days

期刊介绍： The International Journal of Mechanical Sciences (IJMS) serves as a global platform for the publication and dissemination of original research that contributes to a deeper scientific understanding of the fundamental disciplines within mechanical, civil, and material engineering. The primary focus of IJMS is to showcase innovative and ground-breaking work that utilizes analytical and computational modeling techniques, such as Finite Element Method (FEM), Boundary Element Method (BEM), and mesh-free methods, among others. These modeling methods are applied to diverse fields including rigid-body mechanics (e.g., dynamics, vibration, stability), structural mechanics, metal forming, advanced materials (e.g., metals, composites, cellular, smart) behavior and applications, impact mechanics, strain localization, and other nonlinear effects (e.g., large deflections, plasticity, fracture). Additionally, IJMS covers the realms of fluid mechanics (both external and internal flows), tribology, thermodynamics, and materials processing. These subjects collectively form the core of the journal's content. In summary, IJMS provides a prestigious platform for researchers to present their original contributions, shedding light on analytical and computational modeling methods in various areas of mechanical engineering, as well as exploring the behavior and application of advanced materials, fluid mechanics, thermodynamics, and materials processing.