Lattice and Topology Optimization of Additively Manufactured Turbine Blade
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Keywords:
Additive Manufacturing, Lattice Structures, Topology Optimization, Mechanical Properties, Turbine BladeAbstract
The main purpose of the current study has been the structural analysis and topology
optimization of turbine blade model that is fabricated using additively manufactured alloy. Additively
manufactured alloys are widely utilized in applications such as aerospace and biomedical. The
microstructure of additively manufactured Ti-6Al-4V is known to exhibit columnar β grains and a
lamellar α phase, which can induce anisotropy in mechanical properties;an important consideration in
turbine blade design. The reason for why these alloys are selected is due to their high strength-to-weight
ratio and corrosion resistance in several applications. In this study a static structural analysis was
performed with 9 kN centrifugal forces in both X and Z directions to simulate actuality conditions. The
turbine blade was fixed along Z-axis and deformation, elastic strain, equivalent stress and strain energy
were calculated. Results showed that total deformation increased from fixation region to blade tip with
maximum deformation of 6.5 mm. Elastic strain distribution had minimum values near fixation region
and blade tips and maximum strain values are observed around blade stem with values between 0.003
0.005 mm/mm. Elastic strain distribution exhibited minimum values near the fixation region and blade
tips, while maximum strain values were observed around the blade stem, ranging between 0.003-0.005
mm/mm. Equivalent stress patterns has a similar tendency with the elastic strain distribution, and its with
maximum stress values ranges between 544 MPa and 326 MPa. Strain energy distribution had its peak
value of 105 mJ at the mid section of the blade. To reduce weight, lattice structures were added to the
design with highest density near fixation region (0.778-0.667) and moderate density around blade stem
(0.445-0.556). A topology optimized design was generated with a dome like structure near the turbine
blade stem which is different from the initial geometry. These results can be used to improve turbine
blade design by optimized material distribution and structural efficiency.
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