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Design and Evaluation of Polymeric Hybrid FCC-BCC Lattice Structures for Enhanced Mechanical Performance

Rahimi, Shayan | 2024

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  1. Type of Document: M.Sc. Thesis
  2. Language: Farsi
  3. Document No: 57442 (08)
  4. University: Sharif University of Technology
  5. Department: Mechanical Engineering
  6. Advisor(s): Asghari, Mohsen
  7. Abstract:
  8. Throughout history, engineers have always been searching for ways to increase the strength-to-weight ratio in the design of engineering structures. Using lattice structures has been a method implemented in different applications to achieve this goal. Herein, two novel hybrid lattice structures are designed, and their compressive quasi-static mechanical behavior is evaluated experimentally and numerically. In one of the designed structures, using dual-phase strengthening, FCC unit cells are incorporated as a reinforcement phase into a BCC matrix. In the multifunctional lattice structure, FCC and BCC unit cells are combined with their central nodes connected. All of the designed structures are fabricated using stereolithography additive manufacturing and tested under quasi-static compressive loading. The results indicate a 15.71% increase in compressive strength and a 103.75% improvement in volumetric energy absorption for the FRB structure compared to BCC. The Multifunctional structure revealed a 74.30% increase in compressive strength along with a 111.30% improvement in volumetric energy absorption compared to BCC, though it exhibited a 13.33% decrease in specific energy absorption compared to the FCC structure. Both the proposed designs have merits, with the FRB structure suitable for lightweight energy absorption and the Multifunctional structure appropriate for high load-bearing applications where the overall weight is not the primary concern. The elastic modulus predicted by the numerical model had an error in the range of 3% to 15%, and the error for compressive strength was in the range of 8% to 31%
  9. Keywords:
  10. Stereolithography ; Deformation Mechanism ; Energy Absorption ; Dual-Phase Strengthening ; Hybrid Lattice Structure ; Body Center Cubic (BCC)Lattice Structures ; Face-Centered Cubic Crystal

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