Mechanical behavior of 3D printed syntactic foam composites

Bharath, H. S.; Sawardekar, Akshay; Waddar, Sunil; Pitchaimani, Jeyaraj; Doddamani, Mrityunjay

doi:10.1016/j.compstruct.2020.112832

Cited by 32 publications

(9 citation statements)

References 67 publications

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“…Figure 8(c) shows the superior load–deflection performance of the representative FGSF compared with the respective FG core. Compared to neat (plain) HDPE, P cr of FGSF-1, FGSF-2 and FGSF-3 evaluated through DTM and MBC methods are 1.5, 1.99, 1.66 and 1.53, 2.06, 1.7 times of HDPE, respectively (Bharath et al , 2020b). The experimental P cr values of FGSF-1, FGSF-2 and FGSF-3 predicted using the DTM and MBC methods were 1.05, 1.09, 1.106, and 1.05, 1.10, 1.11 times for FGF-1, FGF-2 and FGF-3, respectively.…”

Section: Resultsmentioning

confidence: 99%

“…The density (H: 950 kg/m 3 , H20: 880 kg/m 3 , H20: 810 kg/m 3 and H20: 740 kg/m 3 ) and Poisson’s ratio (H: 0.425, H20: 0.382, H40: 0.339 and H60: 0.296) were used in the Bradelle–Genna model (BGM) to estimate the Young’s modulus of the SFs (Bardella and Francesco, 2001). A numerical analysis was performed by selecting the material properties according to layer thickness (Bharath et al , 2020b). The analysis was initiated with a linear eigenvalue buckling problem through which first buckling mode shapes were obtained.…”

Section: Methodsmentioning

confidence: 99%

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Dynamic response of 3D printed functionally graded sandwich foams

Bonthu,

H.S.,

Bekinal

et al. 2023

RPJ

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Purpose The purpose of this study was to introduce three-dimensional printing (3DP) of functionally graded sandwich foams (FGSFs). This work was continued by predicting the mechanical buckling and free vibration behavior of 3DP FGSFs using experimental and numerical analyses. Design/methodology/approach Initially, hollow glass microballoon-reinforced high-density polyethylene-based polymer composite foams were developed, and these materials were extruded into their respective filaments. These filaments are used as feedstock materials in fused filament fabrication based 3DP for the development of FGSFs. Scanning electron microscopy analysis was performed on the freeze-dried samples to observe filler sustainability. Furthermore, the density, critical buckling load (Pcr), natural frequency (fn) and damping factor of FGSFs were evaluated. The critical buckling load (Pcr) of the FGSFs was estimated using the double-tangent method and modified Budiansky criteria. Findings The density of FGSFs decreased with increasing filler percentage. The mechanical buckling load increased with the filler percentage. The natural frequency corresponding to the first mode of the FGSFs exhibited a decreasing trend with an increasing load in the pre-buckling regime and an increase in post-buckled zone, whereas the damping factor exhibited the opposite trend. Originality/value The current research work is valuable for the area of 3D printing by developing the functionally graded foam based sandwich beams. Furthermore, it intended to present the buckling behavior of 3D printed FGSFs, variation of frequency and damping factor corresponding to first three modes with increase in load.

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Section: Resultsmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

Dynamic response of 3D printed functionally graded sandwich foams

Bonthu,

H.S.,

Bekinal

et al. 2023

RPJ

Self Cite

View full text Add to dashboard Cite

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“…3D printing of polymer composites addresses these issues by combining the polymer matrix and nanomaterial reinforcements to generate a society with more valuable structural and functional features than either of the constituents could achieve on their own (Thomas et al, 2019).These reinforcements are usually denser and can be incorporated directly into the polymer matrix to form porous structures (Patil et al, 2019;Bharath et al, 2020;Bonthu et al, 2020).The development of polymer matrix composites, which have great mechanical performance and outstanding functionality, is made feasible by adding reinforcements to polymers in the form of fibers, particles or nanomaterials (Wang et al, 2017). Porosity and fiber orientation of composites have a considerable impact on the properties of final composite products (Patil et al, 2019).…”

Section: Composite Printing Foammentioning

confidence: 99%

Research progress of 3D printing combined with thermoplastic foaming

Sun

2022

Front. Mater.

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Thermoplastic foam additive manufacturing is a brand-new industry that perfectly combines the advantages of polymer foaming with AM. The 3D printing industry currently suffers from limited available materials and monolithic part manufacturing, and 3D printed foam offers a new way of thinking to address these challenges. Designing multifunctional components with additive manufacturing gives designers great flexibility, while foaming reduces the weight of materials and costs. The combination of the two allows for the creation of lightweight structural and functional items with differentiated physical properties. This one-of-a-kind and innovative approach can be achieved in the printed section. 3D printing foam, on the other hand, is still in its infancy. This review examines the respective functions and applications of additive manufacturing and foaming, and then attempts to summarize four commonly used 3D printing methods at this stage:1) cellular scaffolds; 2) composite printing foam; 3) post-foaming of printed solid scaffolds; 4) in-situ foam 3D printing. Among these methods, in-situ foam 3D printing is the technique that properly merges the foaming and fused filament fabrication processes. Although in the early stages of research and not yet fully established, this foam 3D printing technique seems to be the trend to replace other foaming processes.

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“…The viscoelastic behavior of the core material has a major impact on the final damping performances of the structure. 2,3 Starting from this premise, new material concepts have been considered by customizing their components, as syntactic foam composites with addition of nanoparticles, [4][5][6][7] by using 3D printing technique for the structure realization, 8,9 or considering multilayered frequency-dependent material for damping improvements. 3,10 An interesting example is the study conducted by Shahdin et al, 11 where the damping performance obtained with a Nomex-aramid honeycomb was compared with that obtained by using foam (Rohacell 51A) as core material.…”

Section: Introductionmentioning

confidence: 99%

Experimental characterization and numerical modeling of a viscoelastic expandable epoxy foam: Time–temperature transformation and time–temperature equivalence diagrams

D׳Elia

Sanches

Des³

et al. 2023

J of Applied Polymer Sci

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An expandable and Fire, Smoke, and Toxicity (FST) compliant epoxy foam is proposed as an interesting alternative to Nomex ® honeycomb cores for the development of Multi-Functional Structures (MFS). The paper first analyzes the processing conditions using several experimental techniques as differential scanning calorimetry (DSC), rheology, and expansion in a closed volume in order to evaluate the reaction kinetics, the chemorheological behavior, and the expansion kinetics of the material. The experimental data are used to identify several empirical models describing the material processing behavior and finally plotting the isothermal time-temperature transformation (TTT) diagram. A typical curing cycle for the foam is used to describe the evolution of the material parameters during the curing process. The fully cured foam is then characterized using optical and laser microscopy in order to identify its cell size distribution and density. Quasi-static and dynamic machines are used to evaluate its mechanical and dynamical properties. The time-temperature equivalence is finally used to plot the master's curves of the material, representing the evolution of the material viscoelastic properties as a function of the frequency.

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Mechanical behavior of 3D printed syntactic foam composites

Cited by 32 publications

References 67 publications

Dynamic response of 3D printed functionally graded sandwich foams

Dynamic response of 3D printed functionally graded sandwich foams

Research progress of 3D printing combined with thermoplastic foaming

Experimental characterization and numerical modeling of a viscoelastic expandable epoxy foam: Time–temperature transformation and time–temperature equivalence diagrams

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