Failure Modes and Deformation Patterns in 2D Sandwich Architected Materials Under Static and Dynamic Loading

@article{1718338,
      author = {Bamidele Fadayomi},
      title = {Failure Modes and Deformation Patterns in 2D Sandwich Architected Materials Under Static and Dynamic Loading},
      journal = {Iconic Research And Engineering Journals},
      year = {2023},
      volume = {7},
      number = {2},
      pages = {877-891},
      issn = {2456-8880},
      url = {https://www.irejournals.com/formatedpaper/1718338.pdf},
      abstract = {This study develops and executes a systematic experimental protocol for testing different variations of 2D honeycomb and diamond sandwich architected structures manufactured from UV-cured brittle photopolymer resin via additive manufacturing. Each sandwich structure was subjected to three loading conditions: local compression (3-point bending), uniform compression (quasi-static compression), and low-velocity impact loading, with five replicate specimens per combination. The research addresses four central questions: how do the tested lattices fail; what aspects of failure are reproducible; what effect does micro-architecture have on failure; and what are the differences between dynamic and static loading for these sandwich structures. The 2D architected structures were parametrically varied by changing a specific angle (θ) in their unit cell. For honeycomb, the angular variations were 15°, 30°, 45°, and functionally graded; for diamond, 45°, 90°, 120°, and functionally graded. Results show that core shear was the dominant failure mode across all honeycomb variations, while buckling dominated for the 45° and 90° diamond variations. The 120° and functionally graded diamond variations exhibited bending-dominated deformation with minimal fracture. Load responses under static loading conformed to Type II structural behaviour for honeycomb and the lower-angle diamond variations, and Type I behaviour for the 120° and functionally graded diamond configurations. Repeatable fracture and deformation patterns   including 120° and 180° fracture path lines   were identified across most variations. The 45° diamond variation demonstrated the highest strength and stiffness, while the 120° diamond variation showed the highest impact absorption. Functionally graded structures exhibited a notable tunability effect, enabling selective compliance in targeted core regions.},
      keywords = {Architected Materials, Sandwich Structures, Honeycomb, Diamond Lattice, Failure Modes, Additive Manufacturing, 3-Point Bending, Quasi-Static Compression, Low-Velocity Impact, Digital Image Correlation},
      month = {August},
      doi = {https://doi.org/10.64388/IREV7I2-1718338}
  }