研究目的
To simulate the residual stresses and residual distortions in the directed energy deposition additive manufacturing by laser and study the scaling effects.
研究成果
The residual stress and deformation in circle component in DED AM are simulated. Asymmetrical distribution of thermal stress caused by special temperature history at the initial manufacturing point is found. With the increase of cooling rate, decreased residual stress and distortions can be found. The bending distortion of deposition layers is increased with the decrease of radius of circle component in DED AM.
研究不足
The analytical model is only valid for circle shapes due to the use of the cylindrical coordinate system. The temperature is simplified to be uniform for solutions.
1：Experimental Design and Method Selection:
A sequentially coupled thermo-mechanical finite element model (FEM) is established to simulate the residual states of AM components. The temperature dependent physical properties of Ti–6Al–4V are given.
2：Sample Selection and Data Sources:
The substrate for AM is in dimension of 300 × 300 × 15 mm. Circle components with diameters of 250 and 150 mm are selected to study the scaling effects in AM.
3：List of Experimental Equipment and Materials:
The directed energy deposition additive manufacturing system comprises ZH 30/60III six-axis manipulator made by Kuka in Germany, LDF 4000-100 Laser Generator made by Laserline in Germany, and YC52 Laser head made by Precitec in Germany.
4：Experimental Procedures and Operational Workflow:
The build geometries are deactivated at the beginning of DED AM. With the moving of the laser beam, the build geometries are gradually activated element by element and layer by layer.
5：Data Analysis Methods:
The temperature history is applied in mechanical analysis. The total strain increment can be divided into elastic strain increment, plastic strain increment, and thermal strain increment.
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