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Recent advances in natural fiber reinforced metal/ceramic/polymer composites: An overview of the structure-property relationship for engineering applications

Hybrid Advances

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Hybrid Advances 2025年 8卷

作者： Olanrewaju, Olajesu Oladele, Isiaka Oluwole Adelani, Samson Oluwagbenga Department of Materials Science and Engineering Iowa State University Ames IA United States Department of Metallurgical and Materials Engineering Federal University of Technology PMB Akure 704 Nigeria Centre for Nanomechanics and Tribocorrosion School of Metallurgy Chemical and Mining Engineering University of Johannesburg Johannesburg South Africa Materials Science and Engineering Program University of Colorado Boulder 80303 CO United States

Advances in the material science world drive the birth of a new generation of sustainable materials. Natural fiber (NFs) biocomposites are emerging as valuable alternatives to conventional materials for engineering applications such as construction, automobiles, and aerospace due to their exceptional mechanical properties, lightweight, low carbon footprint, energy efficiency, and cost-effectiveness. These outstanding properties have made them more desirable for engineering applications. However, the focus has been on lignocellulosic fibers, neglecting other sources, such as keratinous, fibrinous, and microorganism fibers. Only a few reviews have considered the structure-property relationship of all classes of natural fibers, such as lignocellulosic (plant), keratinous and fibrinous (animal), and microorganism (mycelium) fibers. Although NFs have outstanding potential from an economic, technical, environmental, and green credentials perspective, they have limitations, such as fiber-matrix incompatibility and moisture damage. These limitations make using NFs as reinforcement for different material systems challenging. Surface alterations are usually necessary to improve the adherence between fiber and matrix. With the upgrade, NFs have the potential as sustainable replacement for conventional materials for engineering applications. Future research should aim at reconciling the mechanical properties of NFs to improve composite quality and fiber-matrix adherence and performance. © 2025 The Authors

关键词： Biocomposites Fibrinous Keratinous Lignocellulosic Microorganism Natural fiber

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A Comprehensive Review on plant and animal fiber reinforced composites: Experimental and theoretical approaches to interfacial strength optimization and potential applications

Hybrid Advances

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Hybrid Advances 2025年 10卷

Natural fiber-reinforced composites (NFRCs) have become vital in various engineering applications due to their exceptional properties and ease of manufacturing. Properties such as lightweight, sustainability, design flexibility, microstructure, durability, and advanced fabrication techniques have expanded their use across industries. Also, NFRCs are preferred because the extensive reliance on synthetic fibers presents significant challenges in recycling and waste management. Despite their excellent properties, NFRCs have three main challenges: fiber degradation, water degradation, and weak interfacial strength (incompatibility of fibers with the matrix). Consequently, research efforts have been directed at combating these challenges using different surface treatment techniques. However, research has been skewed towards experimental approaches for improving the interfacial strength in plant fiber polymer matrix composites (PMCs). Hence, there exists a dearth of information on the computational approaches for optimizing the interfacial properties of NFRCs. Hence, this review provides experimental and computational approaches (machine learning) for comprehensive optimizing strategies for different natural fibers (plant, animal, and microorganism) and matrices (polymers, metals, and ceramics). This review also highlights the importance of theoretical approaches and numerical modeling in analyzing and optimizing NFRCs. Finally, the review highlights recent advancements in NFRCs, their mechanical properties, potential applications, and future directions. © 2025 The Authors

关键词： Animal fiber Interfacial shear strength Machine-learning Natural fiber-reinforced composites Plant fiber

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Dynamic stability of mine slopes due to bench blasting 14th

Dynamic stability of mine slopes due to bench blasting

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14th International Congress on Rock Mechanics and Rock engineering, ISRM 2019

作者： Prassetyo, S.H. Simangunsong, G.M. Sadikin, A. Mining Engineering Program Institut Teknologi Bandung Bandung Indonesia Adimitra Baratama Nusantara East Borneo Indonesia

ISBN: (纸本)9780367422844

In this paper, analysis of dynamic stability is carried out for highwall and lowwall slopes in an open cut coal mine in Indonesia. An explicit-based finite difference program called Fast Lagrangian Analysis of Continua (FLAC) is used to perform the static and dynamic simulations of the mine slopes to monitor various problems during the seismic excitation from the blast wave, including the maximum permanent deformation, the peak particle acceleration (PPA), and the peak particle velocity (PPV). Two stability criteria are used to evaluate the dynamic stability of the slopes due to blasting: (1) the maximum permanent deformation and (2) the dynamic factor of safety (FoS). The results of dynamic simulations in FLAC suggest that the blast pattern should be designed so that it will not exceed the predicted PPV = 18 mm/s and PPA = 0.04 g for the highwall slope and the predicted PPV = 34 mm/s and PPA = 0.08 g for the lowwall slope. In addition, unlike the PPA, the maximum permanent displacement is not that sensitive to the stability of the mine slopes under dynamic loading. © 2020 ISRM.

关键词： Coal mines

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Updated Conceptual Model and Resource Assessment using Numerical Reservoir Simulation of Danau Ranau Geothermal Field Indonesia 9

Updated Conceptual Model and Resource Assessment using Numer...

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9th ITB International Geothermal Workshop 2020, IIGW 2020

作者： Afiat Idianto, Onny Rera, Gladiez Florista Wardoyo, Galih Kusumo Sutopo Pratama, Heru Berian Hamdani, Muhammad Ridwan Geothermal Engineering Master's Program Faculty of Mining and Petroleum Engineering Institut Teknologi Bandung Jl. Ganesha 10 Bandung40132 Indonesia Jl. Ganesha No.10 Lb. Siliwangi Coblong West Java Bandung40132 Indonesia

Danau Ranau geothermal field is located in Lampung and South Sumatra province, Indonesia. It is classified as a high terrain volcanic hydrothermal system controlled by the Sumatran fault as the permeability zone. The study aims to characterize the Danau Ranau reservoir, update the conceptual model, and assess the geothermal power capacity coupled with Monte Carlo simulation. Therefore, the numerical reservoir simulation is performed using TOUGH2 software to achieve a natural state model based on geoscience interpretation data. The numerical reservoir models' output matches the geological, geochemical, and geophysical interpretation, thus becoming important information (3D pressure and temperature, heat and mass flow, location of heat source, boundary condition, reservoir geometry) in the updated conceptual model. The probabilistic heat stored method results based on the natural state model's output show that Danau Ranau geothermal field can generate up to 30 MW. © Published under licence by IOP Publishing Ltd.

关键词： Monte Carlo methods

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Resonance-based Radar Target Classification using the Matrix Pencil Method and the Cauchy Method

Resonance-based Radar Target Classification using the Matrix...

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2021 IEEE International Symposium on Antennas and Propagation and North American Radio Science Meeting, APS/URSI 2021

作者： Li, Siyuan Hargrave, Chad Owen Lui, Hoi-Shun University of Queensland St. LuciaQLD4072 Australia Sustainable Mining Research Program PullenvaleQLD4069 Australia School of Electrical and Data Engineering University of Technology Sydney UltimoNSW2007 Australia

ISBN: (纸本)9781728146706

A comparison of the Matrix Pencil Method and the Cauchy Method is studied. The two methods both serve as natural resonant frequency extraction algorithm but is based on information in different domains. Their performances are analyzed using synthesized data and full-wave simulated data. Both methods present the capability to extract NRFs from targets. Numerical results are presented to show the similarity and differences between the two methods. © 2021 IEEE.

关键词： Natural frequencies

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Effects of silver doping in the structural and optical properties of hematite (α-fe2o3) synthesized via chemical precipitation method 11th

Effects of silver doping in the structural and optical prope...

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11th International Conference on Key engineering Materials, ICKEM 2021

作者： Tan, Aldrin A. Lacuesta, Aldwin Christian T. Gili, Mon Bryan Z. Cervera, Rinlee Butch M. Materials Science and Engineering Program College of Science University of the Philippines Diliman Quezon City1101 Philippines Department of Mining Metallurgical and Materials Engineering University of the Philippines Diliman Quezon City1101 Philippines Philippine Nuclear Research Institute Department of Science and Technology Philippines

ISBN: (纸本)9783035738872

Hematite (α-Fe2O3) is a low-cost n-type semiconductor with significant absorption of visible light owing to its low bandgap energy of 2.1 eV. The wide applications of hematite in renewable energy and environmental remediation continuously entice more studies. However, the low absorbance of solar energy in the UV-range significantly limits the efficiency of many photocatalytic materials. In this study, we tried to dope α-Fe2O3 with silver via chemical precipitation method to lower the bandgap energy and widen its absorbance. The effects of doping hematite with Ag on the structure, morphology, elemental composition, and optical absorbance were determined by characterizing the samples via X-ray diffractometry (XRD), scanning electron microscopy (SEM), energy dispersive X-ray (EDX) analysis, and UV-Vis spectroscopy, respectively. It was observed from the XRD patterns that the α-Fe2O3 crystallizes in hexagonal structure with lattice parameters a = 5.0380 Å and c = 13.7720 Å for the pure α-Fe2O3. Doping with 0.1M and 0.2M AgNO3 leads to a greater value of the lattice parameters indicating successful doping. SEM images show that the hematite formed was composed of particles with irregular shapes that have sizes in the range 0.865-0.883 μm. Excess silver particles were deposited on the surface of hematite. UV-Vis spectra show that there is a red-shift in the absorption band of the Ag-doped hematite. A notable decrease in the bandgap energy of the undoped α-Fe2O3 was observed from ~2.2eV to ~2.0eV with the increase in the amount of the dopant in the hematite as determined using Tauc’s plot. © 2021 Trans Tech Publications Ltd, Switzerland.

关键词： Hematite

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Geological Controls on Thermal Manifestation Occurences in Batu Gede and Batu Kapur, Subang Regency: A Preliminary Result 9

Geological Controls on Thermal Manifestation Occurences in B...

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9th ITB International Geothermal Workshop 2020, IIGW 2020

作者： Sibarani, Betseba Br. Sianipar, Juni Yesy Daniel, Danny Apriani, Lestari Danakusumah, Grandy Suryantini Geothermal Research Group Geothermal Master Program ITB FTTM Bandung Indonesia Geothermal Engineering Master's Program Faculty of Mining and Petroleum Engineering Institut Teknologi Bandung Jl. Ganesha 10 Bandung40132 Indonesia Geology Padjajaran University Bandung Indonesia Applied Geology Research Group Faculty of Earth Science and Technology Bandung Indonesia

Batu Gede and Batu Kapur are administratively located in Subang Regency, West Java, precisely in the northern part of Tangkuban Perahu Geothermal Working Area. Characteristics of the manifestations in Batu Gede and Batu Kapur are generally bicarbonate neutral pH warm springs and their location exposed in the foot of Tangkuban Perahu Volcano. Despite the similar chemical characteristic of those two manifestations, there is a significant characteristic difference between them. Spring with low pH with the pungent smell emerges in the Batu Gede not far from neutral pH bicarbonate warm spring. The aim of this research is to determine control of the occurrence and relationship of manifestation in both areas by conducting geological mapping. Surface manifestations are controlled by a geological process associated with primary and secondary permeability. Both manifestations emerge dominantly in the control of fault as a secondary permeability. Primary permeability also controls the occurrence of manifestations but not significant. Batu Gede manifestations are dominantly controlled by overstepping structure, while Batu Kapur are dominantly controlled by intersections between structures. Based on high content of SO4-2, acid pH, and the presence of sulfur, the acid manifestation might be correlated with magmatic activity beneath Batu Gede's manifestation. © Published under licence by IOP Publishing Ltd.

关键词： Geology

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Thermal Stability of Copper Processed by Multidirectional Forging Effect of Deformation Amplitude and Cumulative Strain

SSRN

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SSRN 2022年

作者： Flausino, Paula Cibely Alves Corrêa, Elaine Carballo Siqueira Pereira, Pedro Henrique Rodrigues Aguilar, Maria Teresa Paulino Cetlin, Paulo Roberto Graduate Program in Metallurgical Materials and Mining Engineering UFMG Brazil Dept of Metallurgical and Materials Engineering UFOP Brazil Department of Materials Engineering CEFET-MG Brazil Dept of Metallurgical and Materials Engineering UFMG Brazil Dept of Construction and Materials UFMG Brazil Dept of Mechanical Engineering UFMG Brazil

Experiments were performed in order to evaluate the effect of deformation amplitude (∆Ε) and cumulative strain (Ε) on the thermal stability of Copper 99.8% pure, after processing with 8 and 48 Multidirectional forging (MDF) cycles at room temperature with ∆Ε ≈ 0.075 (MDF0.075) or 2 and 12 MDF cycles with ∆Ε ≈ 0.30 (MDF0.30), leading to cumulative deformations of Ε ≈ 1.8 and 10.8. The microstructural stability at elevated temperatures was evaluated through Differential Scanning Calorimetry (DSC) and heat treatments, combined with Vickers microhardness measurements and Electron Backscattered Diffraction (EBSD). Further analyses were carried out through thermodynamic considerations about the stored energy and driving pressures for boundary migration. The results showed that the thermal stability associated with static recrystallization decreases as Ε and ΔΕ in MDF increase, due to the presence of finer grain structures and higher dislocation density in the as-deformed material. In addition, the MDF-processed specimens deformed with high Ε and ΔΕ exhibited finer recrystallized grains than those processed with low Ε and ΔΕ as a result of their increased number of nucleation sites. Thermal stability increases in the following order: 12C-MDF0.30, 2C-MDF0.30, 48C-MDF0.075 and 8C-MDF0.075 © 2022, The Authors. All rights reserved.

关键词： Copper

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Geothermal Prospect Review in the Western Part of Salak Volcano, West Java, Indonesia 9

Geothermal Prospect Review in the Western Part of Salak Volc...

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9th ITB International Geothermal Workshop 2020, IIGW 2020

作者： Aprilina, Nur Vita Golla, Glenn U. Kusumah, Yudi Indra Suryantini Star Energy Geothermal Salak Sentral Senayan II Office Tower Jalan Asia Afrika No. 8 Jakarta10270 Indonesia Geothermal Engineering Master's Program Faculty of Mining and Petroleum Engineering Institut Teknologi Bandung Jl. Ganesha 10 Bandung40132 Indonesia

The Ertankian Geothermal Prospect is located in the southern area of Bogor District, West Java, Indonesia. From 1982 through the end of 1983, Unocal Geothermal of Indonesia, Ltd. (UGI) conducted extensive geological, geochemical, and geophysical surveys that outlined Ertankian as a potential geothermal field on the flanks of the Salak Volcano. This volcano forms the north-eastern part of the Salak-Perbakti-Gagak Volcanic Massif, which consists of Upper Pleistocene to Recent stratovolcanoes, parasitic vents, and phreatomagmatic craters. The exploration survey included, magnetotelluric and gravity surveys, water geochemistry, thermal manifestation gas, ion, and isotope analyses, and geological, photo-geological interpretation, and photogrammetry interpretation. Kawah Ertankian is a vigorous fumarole area with numerous superheated and boiling steam vents, boiling acid sulfate hot springs, and large areas of acid-altered ground. Elemental sulfur is common around many of the vents. Steam from the Ertankian Fumaroles contains 7 mol% H2S and the maximum reservoir temperature obtained from the NAH-CO2 gas geothermometer was 525°F. The Ertankian Hot Springs have acid sulfate character and yield little information about the underlying hydrothermal system. Bicarbonate chloride warm springs occur on the northern flanks of the Salak Volcano at northwest and northeast locations and interpreted as the outflow product of Ertankian Geothermal System. Extensive areas of low resistivity are distributed across most of the Ertankian Geothermal Prospects. Low resistivity zones are observed around the Kawah Ertankian thermal manifestation complex and broaden to the far northwestern warm spring and Gunung Perbakti in the southwest. The shallowest base of the conductor is observed in the area near Kawah Ertankian and probably extends towards the northwest in the Alpha-19 well area. Towards the south and southwest, a significant deepening of base of the clay cap is observed. The observed res

关键词： Volcanoes

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Magnetotelluric Data Analysis Using Phase Tensor and Tipper Strike to Determine Geoelectrical Strike in "dKH" Geothermal Field 9

Magnetotelluric Data Analysis Using Phase Tensor and Tipper ...

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9th ITB International Geothermal Workshop 2020, IIGW 2020

作者： Maswah, Fauziah Suryantini Srigutomo, Wahyu Fajri, Reza Jamil Pratama, Angga Bakti Pratomo, Prihandhanu M. Geothermal Engineering Master's Program Faculty of Mining and Petroleum Engineering Institut Teknologi Bandung Jl. Ganesha 10 Bandung40132 Indonesia Jalan Ganesha no. 10 West Java Bandung40132 Indonesia Jalan Warung Buncit Raya No. 75 South Jakarta Indonesia

The magnetotelluric (MT) method is passive geophysical method that measures natural electromagnetic field to estimate the subsurface resistivity structure. Before conducting 2D MT data inversion, data analysis, dimensionality, including determining the direction of the geoelectrical strike must be performed. It is needed to fulfill the assumption of 2D MT modeling. 2D modeling of magnetotelluric data is an important part because the results can determine the quality of the subsurface interpretation. Therefore, this paper describes the determination of the dimensonality and geoelectrical strike using the phase tensor and tipper strike parameters. The invariant parameters of phase tensor including skew angle (β) and ellipticity are used to get the information about the dimensionality and geoelectrical strike. The results from the phase tensor are plotted in a rose diagram to determine the main direction of the geoelectrical strike. The phase tensor analysis contains ambiguity 90°, therefore tipper strike used to validate the analysis. From the analysis, the result shows the 1D or 2D structures of the MT data in high frequency, meanwhile the lower frequency, the majority of the data show 3D structures. The dominant geoelectrical strike is around N15°E and it is confirmed with the regional structure of the area. Determination of dimensionality and geoelectrical strike are applied to MT data from the geothermal field. © Published under licence by IOP Publishing Ltd.

关键词： Tensors

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