Toughening Behavior in Natural Fiber-reinforced Earth-based Composites

MRS Advances ◽  
2016 ◽  
Vol 1 (12) ◽  
pp. 791-797
Author(s):  
Kabiru Mustapha ◽  
Martiale G. Zebaze Kana ◽  
Winston O. Soboyejo
Keyword(s):  
Building Materials ◽  
Natural Fiber ◽  
Crack Tip ◽  
High Strength ◽  
Analytical Investigation ◽  
Ex Situ ◽  
Interface Debonding ◽  
Frictional Stress ◽  
Fiber Reinforced ◽  
Reinforced Earth

ABSTRACTThis study presents a combine experimental and analytical investigation of the toughening behavior in natural fiber-reinforced earth-based composites. A specially designed single fiber pullout apparatus was used to provide a quantitative determination of interfacial properties that are relevant to toughening brittle materials through fiber reinforcement. The parameters investigated included a specially designed high strength earth-based matrix comprising of 60% laterite, 20% clay and 20% cement. The toughening behavior of whisker-reinforced earth-based matrix is analyzed in terms of a whisker bridging zone immediately behind the crack tip and interface strength. This approach is consistent with microscopy observations which reveal that intact bridging whiskers exist behind the crack tip as a result of debonding of the whisker-matrix interface. Debonding with constant frictional stress was obtained and this formed the basis for the analytical model considered and the underlying crack-microstructure interactions associated with Resistance-curve behavior was studied using in situ/ex situ optical microscopy to account for the bridging contribution to fracture toughness. The effect of multiple toughening mechanisms (debonding and crack bridging) was elucidated and the implications of the results are considered for potential applications in the design of robust earth-based building materials for sustainable eco-friendly homes.

INTERFACIAL AND TENSILE PROPERTIES OF HYBRID FRP COMPOSITES USING DNN STRUCTURE WITH OPTIMIZATION MODEL

2019 ◽  
Vol 27 (02) ◽  
pp. 1950099 ◽  
Author(s):  
AHMED ABDUL BASEER ◽  
D. V. RAVI SHANKAR ◽  
M. MANZOOR HUSSAIN
Keyword(s):  
Tensile Properties ◽  
Natural Fiber ◽  
Hybrid Composites ◽  
Research Work ◽  
Composite Plates ◽  
High Strength ◽  
Fiber Reinforced ◽  
Reinforced Concrete Structure ◽  
Shear Strengthening ◽  
Frp Composites

Fiber reinforced polymer (FRP) composites are appealing for use in structural building applications because of their high strength-to-weight and stiffness-to-weight proportions, corrosion resistance, lightweight, possibly high durability, along with free design characteristics. The aim of this research work was to develop high strength natural fiber-based composite plates for the possible application in the shear strengthening of the reinforced concrete structure. In the experimental modeling, the composites were fabricated using glass, flax and kenaf fibers in treated and untreated conditions. This paper studied and analyzed the interfacial and tensile properties of fiber reinforced hybrid composites such as flax/glass and kenaf/glass by using the simulation approach, i.e. Deep Neural Network (DNN) with weight optimization. For optimizing the weights in DNN, Oppositional based FireFly Optimization (OFFO) is proposed. All the optimal results exhibit in the way that the accomplished error values between the output of the experimental values and the predicted qualities are firmly equivalent to zero in the designed system.

scholarly journals AN EXPERIMENTAL EVALUATION OF FIBER REINFORCED POLYPROPYLENE THERMOPLASTICS FOR AEROSPACE APPLICATIONS

2014 ◽  
Vol 43 (2) ◽  
pp. 92-97 ◽  
Author(s):  
K. Vijaya Kumar ◽  
Mir Safiulla ◽  
A.N. Khaleel Ahmed
Keyword(s):  
Epoxy Matrix ◽  
Natural Fiber ◽  
High Strength ◽  
Polyphenylene Sulfide ◽  
Environmental Stability ◽  
Fiber Reinforced ◽  
Aerospace Applications ◽  
Thermosetting Polymers ◽  
Reinforced Thermoplastics ◽  
Fiber Reinforced Thermoplastics

Fiber reinforced thermosetting composites have wide scope in the field of Aerospace and MilitaryApplications. These materials exhibit high strength and high stiffness, besides these composites have long fatiguelife, corrosion resistance, environmental stability, thermal insulation and conductivity. Researchers areexploring possibilities to use natural fiber reinforced polymer composites (NFRPCs) in response to the increasingdemand for environmentally friendly materials and also to develop reusable fiber reinforced thermoplastics withthe desire to reduce the cost and to promote the replacement of thermosetting composites.In this work efforts are put to fabricate fiber thermoplastics made of jute, glass and carbon with (PP)polypropylene as the matrix. The mechanical strength of these fiber reinforced thermoplastics was evaluated andcompared with that of fiber reinforced thermosetting polymers made of same fibers along with epoxy matrix. Thetests clearly indicate that the laminates made of fiber reinforced polypropylene have 7 to 8 times less strengthcompared to thermosetting polymers made of fiber epoxy and it is found that for achieving better strength of thematerial, the polypropylene layers should be more than that of the epoxy matrix or to use alternative thermoplasticmaterials like polyphenylene sulfide (PPS), polyetherimide (PEI) and polyetheretherketone (PEEK). Hence thesematerials are feasible for fabricating low load bearing aircraft interior cabin parts and automobile interiorswhich can be reused or reshaped making them easy to re-work and repair.DOI: http://dx.doi.org/10.3329/jme.v43i2.17832

scholarly journals High-strength cellulose nanofiber/graphene oxide hybrid filament made by continuous processing and its humidity monitoring

2021 ◽  
Vol 11 (1) ◽  
Author(s):  
Hyun Chan Kim ◽  
Pooja S. Panicker ◽  
Debora Kim ◽  
Samia Adil ◽  
Jaehwan Kim
Keyword(s):  
Graphene Oxide ◽  
Natural Fiber ◽  
High Strength ◽  
Cellulose Nanofiber ◽  
Fiber Reinforced Polymer ◽  
Synthesis Process ◽  
Fiber Reinforced ◽  
Humidity Sensing ◽  
Reinforced Polymer ◽  
Humidity Monitoring

AbstractHuman-made natural-fiber-based filaments are attractive for natural fiber-reinforced polymer (NFRP) composites. However, the composites' moisture distribution is critical, and humidity monitoring in the NFRP composites is essential to secure stability and keep their life span. In this research, high strength and humidity sensing filament was developed by blending cellulose nanofiber (CNF) and graphene oxide (GO), wet-spinning, coagulating, and drying, which can overcome the heterogeneous mechanical properties between embedded-type humidity sensors and NFRP composites. The stabilized synthesis process of the CNF-GO hybrid filament demonstrated the maximum Young's modulus of 23.9 GPa and the maximum tensile strength of 439.4 MPa. Furthermore, the achieved properties were successfully transferred to a continuous fabrication process with an additional stretching process. Furthermore, its humidity sensing behavior is shown by resistivity changes in various temperature and humidity levels. Therefore, this hybrid filament has excellent potential for in-situ humidity monitoring by embedding in smart wearable devices, natural fiber-reinforced polymer composites, and environmental sensing devices.

scholarly journals Nano/Micro Hybrid Bamboo Fibrous Preforms for Robust Biodegradable Fiber Reinforced Plastics

Polymers ◽  
2021 ◽  
Vol 13 (4) ◽  
pp. 636
Author(s):  
Junsik Bang ◽  
Hyunju Lee ◽  
Yemi Yang ◽  
Jung-Kwon Oh ◽  
Hyo Won Kwak
Keyword(s):  
Mechanical Properties ◽  
Natural Fiber ◽  
Fibrous Composite ◽  
Cellulose Nanofibers ◽  
Fiber Surface ◽  
High Strength ◽  
Fiber Reinforced ◽  
Reinforced Plastics ◽  
Reinforced Plastic ◽  
Industry Applications

The focus on high-strength and functional natural fiber-based composite materials is growing as interest in developing eco-friendly plastics and sustainable materials increases. An eco-friendly fibrous composite with excellent mechanical properties was prepared by applying the bamboo-derived nano and microfiber multiscale hybridization phenomenon. As a result, the cellulose nanofibers simultaneously coated the micro-bamboo fiber surface and adhered between them. The multiscale hybrid phenomenon implemented between bamboo nano and microfibers improved the tensile strength, elongation, Young’s modulus, and toughness of the fibrous composite. The enhancement of the fibrous preform mechanical properties also affected the reinforcement of biodegradable fiber-reinforced plastic (FRP). This eco-friendly nano/micro fibrous preform can be extensively utilized in reinforced preforms for FRPs and other green plastic industry applications.

NATURAL FIBER REINFORCED COMPOSITES FOR FEMORAL COMPONENT OF TOTAL HIP ARTHROPLASTY

2005 ◽  
Vol 05 (03) ◽  
pp. 443-454
Author(s):  
S. A. ASGARI ◽  
A. M. HAMOUDA ◽  
S. B. MANSOR ◽  
E. MAHDI ◽  
R. WIRZA ◽  
...  
Keyword(s):  
Femoral Component ◽  
Carbon Fibers ◽  
Natural Fiber ◽  
Promising Result ◽  
Natural Fibers ◽  
Stress Shielding ◽  
Interface Debonding ◽  
Fiber Reinforced ◽  
Fiber Reinforced Composite ◽  
Reinforced Composite

This paper describes a theoretical approach to compare two types of fiber reinforced composite materials for femoral component of hip implants. The natural fiber reinforced composite implant is compared with carbon fiber reinforced composite and the results are evaluated against the control solution of a metallic implant made of titanium alloy. With identical geometry and loading condition, the composite implants assumed lower stresses, thus induced more loads to the bone and consequently reduced the risk of stress shielding, whilst the natural fiber reinforced composite showed promising result compared with carbon fibers. However, natural fibers, as well as carbon fibers, lack the power to improve interface debonding due to excessive loads in interface. Nevertheless, natural fiber reinforced composite could be an appropriate alternative given its capability of tailoring and achieving the optimal fiber orientation and robust design.

scholarly journals Curved Foldable Tailored Fiber Reinforcements for Moldless Customized Bio-Composite Structures. Proof of Concept: Biomimetic NFRP Stools

Polymers ◽  
2020 ◽  
Vol 12 (9) ◽  
pp. 2000 ◽  
Author(s):  
Gabriel Rihaczek ◽  
Maximilian Klammer ◽  
Okan Başnak ◽  
Jan Petrš ◽  
Benjamin Grisin ◽  
...  
Keyword(s):  
Composite Structures ◽  
Role Model ◽  
Building Materials ◽  
Natural Fiber ◽  
Weight Ratio ◽  
Design Tool ◽  
Fiber Reinforced Polymers ◽  
Fiber Reinforced ◽  
Resource Saving ◽  
Fiber Placement

Fiber Reinforced Polymers (FRPs) are increasingly popular building materials, mainly because of their high strength to weight ratio. Despite these beneficial properties, these composites are often fabricated in standardized mass production. This research aims to eliminate costly molds in order to simplify the fabrication and allow for a higher degree of customization. Complex three-dimensional shapes were instead achieved by a flat reinforcement, which was resin infused and curved folded into a spatial object before hardening. Structural stability was gained through geometries with closed cross-sections. To enable this, the resource-saving additive fabrication technique of tailored fiber placement (TFP) was chosen. This method allowed for precise fibers’ deposition, making a programmed anisotropic behavior of the material possible. Principles regarding the fiber placement were transferred from a biological role-model. Five functional stools were produced as demonstrators to prove the functionality and advantages of the explained system. Partially bio-based materials were applied to fabricate the stool models of natural fiber-reinforced polymer composites (NFRP). A parametric design tool for the global design and fiber layout generation was developed. As a result, varieties of customized components can be produced without increasing the design and manufacturing effort.

scholarly journals The Hardness Analysis of Epoxy Composite Reinforced with Glass Fiber Compared to Nettle Fibers

2020 ◽  
Vol 5 (1) ◽  
pp. 1
Author(s):  
I Gede Putu Agus Suryawan ◽  
NPG Suardana ◽  
IN Suprapta Winaya ◽  
IWB Suyasa
Keyword(s):  
Composite Materials ◽  
Glass Fiber ◽  
Natural Fiber ◽  
Fiber Strength ◽  
High Strength ◽  
Weight Fraction ◽  
Fiber Composites ◽  
Fiber Reinforced ◽  
Fiber Reinforced Composite ◽  
Reinforced Composite

The purpose of this study is to compare the hardness of glass fiber reinforced composite materials with the hardness of netted fiber-reinforced composite materials. Glass fiber is a commercial fiber that has been used in various industries while nettle fiber is a natural fiber that is more environmentally friendly. Composite material has several advantages, namely the form that can be adjusted, high strength, lightweight and resistant to corrosion. Nettle plants are plants that have strong fibers in the bark. In this study, nettle composites were made with variations in the weight fractions of 10%, 15%, and 20%. Hardness testing used the Shore D Durometer. The results of the hardness value of glass fiber composites with weight fractions of 10%, 15%, and 20% are 82.4 Shore D, 84.5 Shore D, and 86.5 Shore D, show an increase in stable hardness because the glass fiber factor is already commercial, the fiber strength is evenly distributed. The hardness values of nettle fiber composites with fractions of 10%, 15%, and 20% are 81.6 Shore D, 85 Shore D, and 86.6 Shore D, the hardness value of each nettle composite increases with the addition of fiber weight fraction but is unstable due to the strength factor of each nettle single fiber uneven. Furthermore, with the right treatment, nettle fiber can replace glass fiber.

scholarly journals Maintenance and Inspection of Fiber-Reinforced Polymer (FRP) Bridges: A Review of Methods

Materials ◽  
2021 ◽  
Vol 14 (24) ◽  
pp. 7826
Author(s):  
Long Tang
Keyword(s):  
Building Materials ◽  
High Strength ◽  
Fiber Reinforced Polymers ◽  
Fiber Reinforced ◽  
Reinforced Polymers ◽  
Reinforced Polymer ◽  
Static And Dynamic Loads ◽  
Potential Damage ◽  
Maintenance And Inspection

Fiber-reinforced polymers (FRPs) are materials that comprise high-strength continuous fibers and resin polymer, and the resins comprise a matrix in which the fibers are embedded. As the technique of FRP production has advanced, FRPs have attained many incomparable advantages over traditional building materials such as concrete and steel, and thus they play a significant role in the strengthening and retrofitting of concrete structures. Bridges that are built out of FRPs have been widely used in overpasses of highways, railways and streets. However, damages in FRP bridges are inevitable due to long-term static and dynamic loads. The health of these bridges is important. Here, we review the maintenance and inspection methods for FRP structures of bridges and analyze the advantages, shortcomings and costs of these methods. The results show that two categories of methods should be used sequentially. First, simple methods such as visual inspection, knock and dragging-chain methods are used to determine the potential damage, and then radiation, modal analysis and load experiments are used to determine the damage mode and degree. The application of FRP is far beyond the refurbishment, consolidation and construction of bridges, and these methods should be effective to maintain and inspect the other FRP structures.

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