Article
Polymer Science
Charles M. Dwyer, Jose G. Carrillo, Jose Angel Diosdado de la Pena, Carolyn Carradero Santiago, Eric MacDonald, Jerry Rhinehart, Reed M. Williams, Mark Burhop, Bharat Yelamanchi, Pedro Cortes
Summary: Additive manufacturing allows for the production of volumetrically varying lattice structures with tailored mechanical response. The use of elastomers as feedstock provides high viscoelasticity and durability, making them suitable for wearable applications. Siemens' Mithril software was utilized to design different lattice configurations, which were then fabricated using vat photopolymerization and thermoplastic material extrusion processes. Both materials offered unique benefits, with compliance and impact protection provided by SIL30 elastomer and increased stiffness provided by Ultimaker TPU filament.
Article
Polymer Science
Jose Angel Diosdado-De la Pena, Charles M. Dwyer, David Krzeminski, Eric MacDonald, Alberto Saldana-Robles, Pedro Cortes, Kyosung Choo
Summary: This research focuses on the manufacturing, testing, and modeling of thermoplastic polyurethane lattices. Using a Kelvin unit cell, non-graded and spatially side-graded lattices were designed and built. Experimental and numerical analysis showed good agreement between the simulated and experimental results under quasi-static and dynamic compressive loads.
Article
Multidisciplinary Sciences
Rudra Gnawali, Andrew Volk, Imad Agha, Tamara E. Payne, Amit Rai, Jimmy Touma
Summary: This study explores the self-collimation and bending of light beams through bio-inspired Spatially Variant Photonic Crystals (SVPCs) for applications in optical communications, multiplexing, and light detection and ranging. Two different SVPC designs are demonstrated to control light through a 90-degree bend and optical logic gates, showing high transmission with low reflection and absorption of light in the near-infrared range. These structures have potential benefits for future optical systems.
SCIENTIFIC REPORTS
(2021)
Article
Chemistry, Multidisciplinary
Kaixuan Li, Huizeng Li, Dan Guo, Xiuqin Zhan, An Li, Zheren Cai, Zheng Li, Zhiyuan Qu, Luanluan Xue, Mingzhu Li, Yanlin Song
Summary: This article presents a method for precise integration of nanoblocks on micromatrices and programmable 3D optical heterostructure patterning via printing-assisted self-assembly. The method allows for on-demand patterning, low cost, and mass production, and facilitates the integration of multiscale materials. The findings have potential applications in designing photonic superstructures and advanced optical devices.
Article
Materials Science, Multidisciplinary
J. Jefferson Andrew, Pawan Verma, S. Kumar
Summary: The study investigated the low-velocity impact behavior of polymer composite plate-lattices manufactured via fused filament fabrication technology, with results indicating the SC-BCC-FCC nanocomposite plate-lattice providing the most favorable impact response and MWCNT significantly influencing the PPR and HDPE plate-lattices.
MATERIALS & DESIGN
(2021)
Article
Chemistry, Physical
Cristina Ramirez, Ali Saffar Shamshirgar, Domingo Perez-Coll, Maria Isabel Osendi, Pilar Miranzo, Girish C. Tewari, Maarit Karppinen, Irina Hussainova, Manuel Belmonte
Summary: 3D printing technologies combined with chemical vapor deposition can be used to fabricate new hybrid materials with tunable properties. The thickness and crystallinity of graphene-based coatings can be controlled by altering the parameters of chemical vapor deposition. Transmission electron microscopy confirms the successful growth of nanocrystalline graphene layers on 3D printed α-Al2O3 substrates, resulting in fully-connected and highly conductive pathways. In terms of thermal conductivity, specimens decorated with graphitic coatings exhibit higher thermal conductivity compared to bare ceramic scaffolds.
Article
Materials Science, Multidisciplinary
Ryan Nam, Michael Jakubinek, Hamed Niknam, Meysam Rahmat, Behnam Ashrafi, Hani E. Naguib
Summary: Tunable energy absorption achieved through grading of lattice structures has high potential for lightweight cellular cores in energy absorbing structures. This study investigates structurally graded and multi-material lattices consisting of plate-based octet unit cells, showing a near 10% increase in specific energy absorption in the plate thickness graded designs compared to baseline octet lattices. Finite element models were developed and showed good agreement with experimental results. The results demonstrate the capacity to adapt the octet lattice structure design through additive manufacturing to better suit the expected load and application.
MATERIALS & DESIGN
(2023)
Article
Polymer Science
Paul F. Egan, Nava Raj Khatri, Manasi Anil Parab, Amit M. E. Arefin
Summary: Emerging polymer 3D-printing technologies enable the design and fabrication of mechanically efficient lattice structures with intricate microscale structures. This study investigates how design and processing strategies influence the mechanical performance of lattice structures. The results reveal the importance of design and fabrication strategies in determining the mechanical properties of lattice structures suitable for various engineering applications.
Article
Materials Science, Multidisciplinary
J. Carlsson, A. Kuswoyo, A. Shaikeea, N. A. Fleck
Summary: The sensitivity of the compressive strength of a polymeric Kelvin lattice to the presence of an epoxy core is investigated both experimentally and numerically. The study shows that the epoxy core prevents the formation of crush bands in the lattice and changes its deformation mode. At finite strain, the strength of the lattice is degraded by bending failure and cracking of the struts and adjacent core, leading to the formation of vertical fissures.
MECHANICS OF MATERIALS
(2024)
Article
Chemistry, Physical
Rachael Sharp, Matthew H. Pelletier, William R. Walsh, Cambre N. Kelly, Ken Gall
Summary: This study investigated the effect of lattice structures on the corrosion behavior of Ti6Al4V implants. The results showed that the 60% lattice structure samples were most susceptible to pitting corrosion. Despite the earlier onset of corrosion, both lattice structure groups displayed lower corrosion rates, indicating a lower severity of corrosion, which correlated with the lattice surface area to void volume ratio.
Article
Nanoscience & Nanotechnology
Thomas J. Kolibaba, Ethan T. Iverson, Hudson Legendre, Callie I. Higgins, Zachary N. Buck, Timothy S. Weeks, Jaime C. Grunlan, Jason P. Killgore
Summary: Photopolymer additive manufacturing has gained widespread interest for its ability to fabricate complex geometries. However, the flammability of photopolymer materials and lattice structures in 3D printing hinder their wider use. By coating 3D printed parts with a water-based nanobrick wall coating, their fire resistance can be significantly improved, especially for lattice structures.
ACS APPLIED MATERIALS & INTERFACES
(2023)
Article
Nanoscience & Nanotechnology
Thomas J. Kolibaba, Ethan T. Iverson, Hudson Legendre, Callie I. Higgins, Zachary N. Buck, Timothy S. Weeks, Jaime C. Grunlan, Jason P. Killgore
Summary: Photopolymer additive manufacturing is gaining widespread interest for its ability to fabricate complex geometries that traditional methods cannot achieve. However, the flammability of photopolymer resin materials and lattice structures pose barriers to widespread adoption. This study explores the use of a water-based nanobrick wall coating on 3D printed parts to improve fire resistance. The coating significantly increases time to failure in flammability testing for lattice structures by up to approximately 340%, due to the increased surface area and better accommodated thermal expansion strains. Nanobrick wall coated lattices can act as metamaterials to expand polymer additive manufacturing applications in extreme environments.
ACS APPLIED MATERIALS & INTERFACES
(2023)
Article
Engineering, Civil
Niranjan Kumar Choudhry, Biranchi Panda, S. Kumar
Summary: In this study, a pair of novel 2D re-entrant auxetic lattices capable of exhibiting enhanced stiffness and energy absorption is proposed by introducing vertical ligaments into conventional re-entrant structures. The deformation patterns and the energy absorption characteristics of the lattices were investigated via simulations and experiments. The results suggest that the proposed structures exhibit enhanced stiffness and superior energy absorption compared to conventional lattices.
THIN-WALLED STRUCTURES
(2023)
Article
Engineering, Manufacturing
John McDonald-Wharry, Maedeh Amirpour, Kim L. Pickering, Mark Battley, Yejun Fu
Summary: Foam-like polyester composite materials were 3D-printed from a thermoset paste formulation, with the compressive performance of these lattice structures investigated under different humidity conditions and water immersion. Addition of 5 wt% coconut oil to the formulation prior to printing was found to decrease stiffness under dry conditions while increasing compressive strength after water immersion.
ADDITIVE MANUFACTURING
(2021)
Article
Chemistry, Multidisciplinary
Brandon Lu, Simon Vecchioni, Yoel P. Ohayon, Karol Woloszyn, Tiffany Markus, Chengde Mao, Nadrian C. Seeman, James W. Canary, Ruojie Sha
Summary: This study explores the possibility of self-assembling three-dimensional crystals using unconventional DNA tile motifs and showcases the highly complex symmetric structures that can be generated as a result. The results demonstrate the potential to generate unexpected material design pathways by modifying three-dimensional tiles.