Book Chapters

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    3D printing of fly ash-based syntactic foams
    (Elsevier, 2021) Doddamani, M.; Gupta, N.
    In addition to the ease of fabrication using a wide range of forming processes, thermoplastic polymers are recyclable, which is a strong driving force behind their industrial applications. This chapter deals with manufacturing thermoplastic matrix lightweight composites called syntactic foams (SFs) using in the fused filament fabrication 3D printing process. High-density polyethylene (HDPE) is used as the matrix material and fly ash cenospheres are used as the filler. The development of SFs with cenospheres serves a dual purpose of beneficial utilization of industrial waste fly ash and a reduction in the component cost. Hollow fly ash cenospheres are mixed with HDPE to form a cenosphere/HDPE blend, which is extruded in the form of filaments for commercial 3D printers. Single-screw extruder parameters are optimized to develop eco-friendly SF filaments with minimum cenosphere fracture and homogeneous mixing of constituents. Fly ash-based SFs are successfully 3D printed for mechanical characterization and their properties are observed to be comparable to injection molded specimens of the same compositions. 3D printing of industrial components is successfully demonstrated with potential weight saving capabilities of 8% in addition to reduced polymer consumption to the tune of 4.64 million tons globally per year. © 2022 Elsevier Inc. All rights reserved.
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    Antimicrobial Metal-organic Frameworks
    (Wiley-VCH Verlag, 2025) Murugesan, S.
    Metal-organic frameworks (MOFs) belong to a 3D porous material, which is made of metal ions connected together by organic moieties (ligands). Also, it often underlies between coordination compounds and materials science. Owing to its highly porous structure and other functional properties such as high surface area and surface energy, it has been widely used in various applications, especially in electronics and biomedical sectors by tailor-made cations. MOF-based various substrates, including scaffolds, thin films, hydrogels, and 3D-printed structures showed remarkable improvement in various biological characteristics like cell differentiation, tissue regeneration, controlled drug release, and antimicrobial properties combined with mechanical stability. Antimicrobial MOFs are widely used for tissue regeneration as infections are the major reason for scaffolds or implants failure. This chapter deals only with various antimicrobial-based MOF substrates for a range of biomedical applications, such as tissue/organ regeneration, wound dressing materials, 3D-printed scaffolds, and drug delivery systems. © 2025 Wiley-VCH GmbH.
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    Experimental investigation on vibration and static deflection of 3D printed functionally graded triply periodic minimal surface beams
    (Elsevier, 2025) Kurup, M.; Jeyaraj, P.
    This research work presents a comprehensive experimental investigation on free vibration and static deflection behavior of functionally graded triply periodic minimal surface (FG-TPMS) beams. The grading in these beams is obtained by changing the wall thickness of the TPMS unit cell layer wise. Polylactic acid filament is used to print the samples through the fused filament fabrication approach. The study explores the influence of various geometrical dimensions, with specific emphasis on the unit cell size and its graded pattern through the thickness. Four primary lattice cells, namely, gyroid, primitive, diamond, and IWP (I-graph & wrapped package-graph), are chosen for analysis. The findings from this study provide valuable insights, demonstrating that a specific lattice cell pattern with appropriate grading has the potential to enhance the vibration properties and deflection characteristics of 3D-printed samples. This knowledge is crucial for designing lightweight and efficient structures, particularly in the context of advancements in additive manufacturing technologies. © 2026 Elsevier Inc. All rights reserved..
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    Thermal Buckling of 3D Printed Auxetic Core Sandwich Beams
    (Springer, 2025) Dattam, V.K.; Pitchaimani, J.; Doddamani, M.
    Experimental investigation carried out on the thermal deflection behavior of 3D printed poly lactic acid sandwich beams possessing positive, negative, and zero Poisson’s ratio cellular cores is presented. Using a fused deposition modelling based 3D printer, sandwich beams were fabricated and investigated for thermal buckling under different heating conditions. Influence of Poisson’s ratio of the core and orientation of the beam on thermal buckling were also studied. It is found that Poisson's ratio of the core influences the thermal deflection of the beams remarkably. The sandwich beam having a vertically oriented core with zero Poisson's ratio exhibited superior buckling resistance compared to the other two cases. © The Author(s), under exclusive license to Springer Nature Singapore Pte Ltd. 2025.