研究目的
Developing an effective predictive model for accurately predicting deformation and residual stresses in large-scale parts fabricated via the Selective Laser Melting (SLM) process.
研究成果
The layer heat source method effectively predicts thermal history, distortion, and residual stress in the SLM process with reduced computational time. It identifies thermal deformations and residual stresses in different areas, highlighting the potential for delamination and cracks due to rapid heating and cooling. This method serves as a useful tool for parametric studies of process parameters, residual stresses, and deformations.
研究不足
The layer heat source method sacrifices modeling details for computational time-saving, leading to overestimation of peak temperatures and potential inaccuracies in stress and deformation predictions.
1：Experimental Design and Method Selection:
The study employs Finite Element Analysis (FEA) to predict transient thermal cycles and optimize process parameters. An equivalent body heat flux is used as the thermal load in a layer by layer model to simulate the SLM process.
2：Sample Selection and Data Sources:
Two solid cubes with different support structures are modeled to study thermal history and residual stress fields.
3：List of Experimental Equipment and Materials:
The model uses SS304L as the material, with specific process parameters like laser power (200W), laser absorption coefficient (0.7), laser spot diameter (150 μm), and melt pool depth (100 μm).
4：7), laser spot diameter (150 μm), and melt pool depth (100 μm).
Experimental Procedures and Operational Workflow:
4. Experimental Procedures and Operational Workflow: The hatched layer is heated up by an equivalent body heat flux and used as a basic unit to build up the part. The element birth and death function is used to simulate material addition.
5：Data Analysis Methods:
The computed temperature results are used for mechanical calculations to determine thermal stress and deformation.
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