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• W2896795896 abstract "This paper presents a coupled 3D time-dependent numerical approach for modeling the laser solid freeform fabrication (LSFF) process by which the geometry of the deposited materials, temperature distribution, and stress field can be predicted throughout the process. In the proposed method, coupled thermal and stress distributions are numerically obtained assuming the interaction between the laser beam and the powder stream is decoupled. Main process parameters affected by a multilayer deposition due to the formation of non-planar surfaces such as powder catchment efficiency are incorporated into the modeling. Fabrication of a four-layer thin wall of AISI 304L steel is modeled using the proposed algorithm. The geometry of the wall, the temperature, and the stress fields across the modeling domain are studied throughout the fabrication process. The model is then used to investigate the effects of preheating, and clamping the substrate to the workstation. Results show that preheating improves the process by reducing the thermal stresses as well as the settling time for the formation of a steady-state melt pool in the first layer. The results also indicate that clamping the substrate decreases thermal stresses at its critical locations (i.e. deposition region). The reliability and the accuracy of the model are experimentally verified.This paper presents a coupled 3D time-dependent numerical approach for modeling the laser solid freeform fabrication (LSFF) process by which the geometry of the deposited materials, temperature distribution, and stress field can be predicted throughout the process. In the proposed method, coupled thermal and stress distributions are numerically obtained assuming the interaction between the laser beam and the powder stream is decoupled. Main process parameters affected by a multilayer deposition due to the formation of non-planar surfaces such as powder catchment efficiency are incorporated into the modeling. Fabrication of a four-layer thin wall of AISI 304L steel is modeled using the proposed algorithm. The geometry of the wall, the temperature, and the stress fields across the modeling domain are studied throughout the fabrication process. The model is then used to investigate the effects of preheating, and clamping the substrate to the workstation. Results show that preheating improves the process by r..." @default.
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• W2896795896 date "2007-01-01" @default.
• W2896795896 modified "2023-10-16" @default.
• W2896795896 title "A coupled time-dependent numerical simulation on temperature and stress fields in laser solid freeform fabrication process" @default.
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• W2896795896 doi "https://doi.org/10.2351/1.5061039" @default.
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