Studies on Hybrid Bio-Nanocomposites for Structural Applications

Nimbagal, Vijayakumar; Banapurmath, N.R.; Sajjan, Ashok M.; Patil, Arun Y.; Ganachari, Sharanabasava V.

doi:10.1007/s11665-021-05843-9

Cited by 29 publications

(13 citation statements)

References 60 publications

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“…Compared with the analysis results, it can be seen that during the simulation process, as the mesh is refined, the error decreases. Therefore, this finite element analysis method has good convergence and controllability [17]. The performance of convergence can be visualized by comparing the simulation results with the analysis results.…”

Section: Simulation Of Composite Reinforced Concrete Structurementioning

confidence: 97%

Automatic Identification Method of Defects in Concrete Structures Strengthened with Composite Materials Based on a Multi-Scale Model

Lu,

Lin

2023

Coatings

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Due to the inconsistent geometric characteristics of reinforced concrete structures with composite materials, some echo signals have a lower degree of clarity, resulting in problems such as long time, small range, and low accuracy in identifying structural defects. Therefore, in order to improve the accuracy and efficiency of defect identification in composite material reinforced concrete structures, a multi-scale model based on the automatic defect identification method for composite material reinforced concrete structures is proposed. Using the interface connection method, based on continuous distribution coupling and the uniform weighting coefficient calculation method to weigh the interface nodes, we determined the interface connection mode and analyzed the stress–strain relationship. The impact echo method was used to analyze the degree of high-frequency stress wave scattering caused by internal non-uniformity in composite reinforced concrete, and the fast Fourier transform conversion algorithm was used to generate amplitude–frequency curves and resolved thickness or defect depth. The experimental results show that the multi-scale finite element simulation structure of this method is clear and accurate, and although there are errors, they do not affect the simulation results of the structure. The impact echo detection effect is obvious; it can automatically identify defects in composite reinforced concrete structures and quickly and accurately identify defects in different states and positions of composite reinforced concrete, with a recognition accuracy of 98%.

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Section: Simulation Of Composite Reinforced Concrete Structurementioning

confidence: 97%

Automatic Identification Method of Defects in Concrete Structures Strengthened with Composite Materials Based on a Multi-Scale Model

Lu,

Lin

2023

Coatings

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“…The manufacturing process of PLA/sisal composites involves blending PLA resin with sisal fibres, followed by processing through techniques like compression moulding or extrusion. Compared to traditional composite manufacturing processes that may involve higher energy consumption and complex procedures, the production of PLA/sisal composites can be more straightforward and energy-efficient [60,61,62,64].…”

Section: Cost-effectiveness Of Pla/sisal Composites Vs Traditional Ma...mentioning

confidence: 99%

Development of Green Composite Utilizing Sisal Strands and Sustainable 3-D Printed PLA Layers

Ramaiah,

Tilahun,

Negawo

et al. 2024

Text Leather Rev

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PLA/Sisal hybrid composites have been used in cars and technical textile applications. When utilized in composites, 3-D-printed PLA layers can improve performance and homogeneity. The primary goal of this research was to use sisal and 3-D-printed polylactic acid (PLA) layers to develop a sustainable bio-composite. To enhance the bonding of sisal fibres with the PLA matrix, sisal fibres were given a sodium hydroxide treatment. This would improve the mechanical and thermal properties of composites. Sisal fibre (between 4 wt% and 8 wt%), epoxy concentration (between 85 wt% and 90 wt%), and PLA 3-D printing infilling percentage (between 90 wt% and 100 wt%) were the independent parameters. The Taguchi L8 orthogonal array design was used to make the composite samples. The changes in the amounts of PLA infill, epoxy matrix concentration, and sisal fibre content were considered for test sample development. The optimal settings for improving their tensile, flexural, and impact capabilities were determined by analyzing their signal-to-noise ratio (S/N). The PLA/sisal fibre composite showed a remarkable level of mechanical properties in Sample 8, surpassing those of the other samples. To improve mechanical and thermal properties, the appropriate values for sisal fibre composition, PLA infilling percentage, and epoxy concentration percentage were 8 per cent, 95 per cent, and 85 per cent, respectively. After testing, the tensile (293–295.4 Megapascal) (Mpa), impact (2.73–4.84 Mpa), and flexural strength (188.5–270.4 Mpa) results show that the new composite has better mechanical behaviour properties. Additionally, FTIR, SEM, and DSC experiments were run to examine the composite's structural characteristics. Using less volatile epoxy resin, a sustainable 3-D-printed PLA layer and Sisal fibre bio-composite were developed.

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“…Various techniques are employed to determine the inclination of MWCNTs with respect to the abscissa. Figure 15 illustrates a specimen with dimensions of 80 mm × 20 mm × 20 mm, wherein MWCNTs of 0.3 nm diameter and 5 mm length are generated using ANSYS Design Modeler [48]. During the alignment of MWCNTs, a uniform direction with dispersion conditions is considered, as depicted in Figure 16, showing a unidirectional pattern of MWCNTs of consistent size.…”

Section: Materials Properties Tablementioning

confidence: 99%

Study on Nanomaterials Coated Natural Coir Fibers as Crack Arrestor in Cement Composite

Musale,

Hunashyal,

Patil

et al. 2024

Advances in Civil Engineering

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The process of inclusion of carbon nanotubes as fibers in cement paste has been proved to have optimistic effect as it enhances the tensile property of cement paste composite. Coir fibers have exceptional mechanical qualities and are thus employed as reinforcement in cement composites. Epoxy resin, which has a high Young’s modulus, is an ideal component for bonding carbon nanotubes (CNTs) to coir fiber. This paper describes a novel kind of nanocomposite made of L-12 epoxy resin and CNTs at the nanolevel, along with coir fibers at the microlevel which operate as crack arrestors. To remove surface contaminants, coir fibers are first treated with sodium hydroxide (NaOH). Epoxy/CNTs polymer coatings were developed at varying CNTs fractions (0.05, 0.1, 0.15, and 0.2 wt.% of cement). Multiwalled CNTs were combined in distilled water, followed by epoxy resin and hardener (9 : 1 v/v) polymer in an ultrasonic sonicator for 90 min to ensure full dispersion of CNTs within the epoxy polymer. This blend is now coated on the treated clustered coir fiber (length 10 cm, 10 strands) and reinforced along the length of a cement composite beam 20 mm × 20 mm × 80 mm in size. Tensile and three-point tests were performed to evaluate the mechanical characteristics of the hybrid composite. The linear elastic finite element analysis is employed to distinguish their failure phenomena via fatigue or fracture behavior. The microstructure behavior and the effect of coating material on the coir fibers were investigated using scanning electron microscope and EDX analysis. The reinforcing impact of nanopolymer coated coir fiber in cement composite diminished the tensile and flexural strength after 0.1 wt.% of CNT fraction but increased the composite’s durability and Young’s modulus. Fourier transform infrared spectroscopy analysis was carried out to assess the chemical interaction between the epoxy/CNTs and the coir fibers. The simulation was performed using ANSYS workbench, and the modeling results were within an acceptable 10% range of the experimental data. Nevertheless, it can be concluded that the hybrid composite is capable of enhancing the composite’s stress and strain capacity by regulating the fracture propagation process at the crack’s end.

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Studies on Hybrid Bio-Nanocomposites for Structural Applications

Cited by 29 publications

References 60 publications

Automatic Identification Method of Defects in Concrete Structures Strengthened with Composite Materials Based on a Multi-Scale Model

Automatic Identification Method of Defects in Concrete Structures Strengthened with Composite Materials Based on a Multi-Scale Model

Development of Green Composite Utilizing Sisal Strands and Sustainable 3-D Printed PLA Layers

Study on Nanomaterials Coated Natural Coir Fibers as Crack Arrestor in Cement Composite

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