Improved properties of corn fiber-reinforced polylactide composites by incorporating silica nanoparticles at interfaces

2019 ◽  
Vol 28 (3) ◽  
pp. 170-179 ◽  
Author(s):  
Honglin Luo ◽  
Zhiwei Yang ◽  
Fanglian Yao ◽  
Wei Li ◽  
Yizao Wan
Keyword(s):  
Mechanical Properties ◽  
Surface Roughness ◽  
Crack Propagation ◽  
Silica Nanoparticles ◽  
Industrial Applications ◽  
Corn Fiber ◽  
Great Promise ◽  
Fiber Reinforced ◽  
Novel Strategy

In this work, we report a novel strategy for improving the interfacial nature in corn fiber/polylactide (CRF/PLA) composites by directly applying a sizing containing silica nanoparticles on the surface of CRFs. This results in enhanced mechanical properties of the CRF/PLA composites. These improvements can be mainly attributed to the presence of silica nanoparticles on CRF-PLA interfaces, which act to resist the crack propagation. The increased surface roughness of CRFs from incorporated silica nanoparticles may also contribute to the enhanced mechanical properties. This simple methodology can be easily scaled up and thus shows great promise in industrial applications.

Interfacial stability and mechanical properties of Al2O3 fiber reinforced Ti matrix composites

1994 ◽  
Vol 9 (2) ◽  
pp. 498-503 ◽  
Author(s):  
Hsin-Fu Wang ◽  
John C. Nelson ◽  
Chien-Li Lin ◽  
William W. Gerberich
Keyword(s):  
Mechanical Properties ◽  
Surface Roughness ◽  
Refractory Metal ◽  
Frictional Coefficient ◽  
Frictional Stress ◽  
Matrix Composites ◽  
Interfacial Stability ◽  
Fiber Reinforced ◽  
Atomic Force ◽  
Al2o3 Fiber

The mechanical properties of the interfaces in an Al2O3 fiber reinforced β-21S Ti alloy have been evaluated by using fiber pushout tests. The Al2O3 fibers were coated with a refractory metal and Y2O3 which served as a diffusion barrier during the HIPing used to produce the metal matrix composites. By doing fiber pushout tests, the interfacial fracture was found to occur at the interface between the refractory metal and the Y2O3. The interfacial shear strength and interfacial frictional stress were measured to be 323 and 312 ± 2 MPa, respectively. The interfacial frictional stress, which is due to asperity interlocking during the fiber sliding, was correlated to the surface roughness of the coated Al2O3 fiber obtained with the aid of an atomic force microscope. The measured surface roughness of 18.8 ± 2.2 nm was related to the frictional stress through Hutchinson's model.9 The frictional coefficient between the Al2O3 fiber and the Ti matrix is calculated to be 0.32 ± 0.02.

Mechanical properties of corn fiber reinforced polypropylene composites using Taguchi method

2015 ◽  
Vol 2 (4-5) ◽  
pp. 3084-3092 ◽  
Author(s):  
N. Ravi Kumar ◽  
CH. Ranga Rao ◽  
P. Srikant ◽  
B. Raghava Rao
Keyword(s):  
Mechanical Properties ◽  
Taguchi Method ◽  
Corn Fiber ◽  
Fiber Reinforced ◽  
Polypropylene Composites

scholarly journals Tensile and Flexural Properties of Silica Nanoparticles Modified Unidirectional Kenaf and Hybrid Glass/Kenaf Epoxy Composites

Polymers ◽  
2020 ◽  
Vol 12 (11) ◽  
pp. 2733 ◽  
Author(s):  
Napisah Sapiai ◽  
Aidah Jumahat ◽  
Mohammad Jawaid ◽  
Mohamad Midani ◽  
Anish Khan
Keyword(s):  
Mechanical Properties ◽  
Silica Nanoparticles ◽  
Polymer Composites ◽  
Fiber Reinforced Polymer ◽  
Flexural Properties ◽  
Fiber Reinforced ◽  
Kenaf Fiber ◽  
Composite Systems ◽  
Reinforced Polymer ◽  
Fiber Reinforced Polymer Composites

This paper investigates the influence of silica nanoparticles on the mechanical properties of a unidirectional (UD) kenaf fiber reinforced polymer (KFRP) and hybrid woven glass/UD kenaf fiber reinforced polymer (GKFRP) composites. In this study, three different nanosilica loadings, i.e., 5, 13 and 25 wt %, and untreated kenaf fiber yarns were used. The untreated long kenaf fiber yarn was wound onto metal frames to produce UD kenaf dry mat layers. The silane-surface-treated nanosilica was initially dispersed into epoxy resin using a high-vacuum mechanical stirrer before being incorporated into the UD untreated kenaf and hybrid woven glass/UD kenaf fiber layers. Eight different composite systems were made, namely KFRP, 5 wt % nanosilica in UD kenaf fiber reinforced polymer composites (5NS-KFRP), 13% nanosilica in UD kenaf fiber reinforced polymer composites (13NS-KFRP), 25 wt % nanosilica in UD kenaf fiber reinforced polymer composites (25NS-KFRP), GKFRP, 5 wt % nanosilica in hybrid woven glass/UD kenaf fiber reinforced polymer composites (5NS-GKFRP), 13 wt % nanosilica in hybrid woven glass/UD kenaf fiber reinforced polymer composites (13NS-GKFRP) and 25 wt % nanosilica in hybrid woven glass/UD kenaf fiber reinforced polymer composites (25NS-GKFRP). All composite systems were tested in tension and bending in accordance with ASTM standards D3039 and D7264, respectively. Based on the results, it was found that the incorporation of homogeneously dispersed nanosilica significantly improved the tensile and flexural properties of KFRP and hybrid GKFRP composites even at the highest loading of 25 wt % nanosilica. Based on the scanning electron microscopy (SEM) examination of the fractured surfaces, it is suggested that the silane-treated nanosilica exhibits good interactions with epoxy and the kenaf and glass fibers. Therefore, the presence of nanosilica in an epoxy polymer contributes to a stiffer matrix that, effectively, enhances the capability of transferring a load to the fibers. Thus, this supports greater loads and improves the mechanical properties of the kenaf and hybrid composites.

Recent Studies of Surface Self-Nanocrystallization (SSNC) of Metallic Materials

2019 ◽  
Vol 956 ◽  
pp. 160-168 ◽  
Author(s):  
Fa Lin Yang ◽  
Dan Song ◽  
Ai Bin Ma ◽  
Jing Hua Jiang ◽  
Zhao Jun Cheng
Keyword(s):  
Mechanical Properties ◽  
Surface Roughness ◽  
Corrosion Resistance ◽  
Surface Modification ◽  
Industrial Applications ◽  
Metallic Materials ◽  
New Materials ◽  
Preparation Methods ◽  
Nanostructured Layers ◽  
Microstructural Mechanism

Surface self-nanocrystallization (SSNC) is a new surface modification technology to develop new materials, which can obtain nanostructured layers with nanograins on the metals surface without changing the chemical composition of the metals. In this study, SSNC was introduced from the aspects of the preparation methods, microstructural mechanism, mechanical properties, surface roughness, corrosion resistance and applications. This paper will provide experience and reference for further comprehensive researches and industrial applications of SSNC.

Characterization of interfaces in CVD-coated nicalon fiber-reinforced SiC

1989 ◽  
Vol 47 ◽  
pp. 556-557
Author(s):  
K.L. More ◽  
R.A. Lowden
Keyword(s):  
Mechanical Properties ◽  
Fracture Toughness ◽  
Chemical Vapor ◽  
Chemical Vapor Infiltration ◽  
Frictional Stress ◽  
Fiber Reinforced ◽  
Pull Out ◽  
Carbon Coated ◽  
Fiber Matrix

The mechanical properties of fiber-reinforced composites are directly related to the nature of the fiber-matrix bond. Fracture toughness is improved when debonding, crack deflection, and fiber pull-out occur which in turn depend on a weak interfacial bond. The interfacial characteristics of fiber-reinforced ceramics can be altered by applying thin coatings to the fibers prior to composite fabrication. In a previous study, Lowden and co-workers coated Nicalon fibers (Nippon Carbon Company) with silicon and carbon prior to chemical vapor infiltration with SiC and determined the influence of interfacial frictional stress on fracture phenomena. They found that the silicon-coated Nicalon fiber-reinforced SiC had low flexure strengths and brittle fracture whereas the composites containing carbon coated fibers exhibited improved strength and fracture toughness. In this study, coatings of boron or BN were applied to Nicalon fibers via chemical vapor deposition (CVD) and the fibers were subsequently incorporated in a SiC matrix. The fiber-matrix interfaces were characterized using transmission and scanning electron microscopy (TEM and SEM). Mechanical properties were determined and compared to those obtained for uncoated Nicalon fiber-reinforced SiC.

INFLUENCE THE QUENCHING AND TEMPERING ON THE MICROSTRUCTURE, MECHANICAL PROPERTIES AND SURFACE ROUGHNESS, OF MEDIUM CARBON STEEL

2018 ◽  
Vol 18 (1) ◽  
pp. 125-135
Author(s):  
Sattar H A Alfatlawi
Keyword(s):  
Mechanical Properties ◽  
Heat Treatment ◽  
Surface Roughness ◽  
Carbon Steel ◽  
Cold Water ◽  
Medium Carbon Steel ◽  
Medium Carbon ◽  
Heating And Cooling ◽  
Treatment Processes ◽  
Quenching And Tempering

One of ways to improve properties of materials without changing the product shape toobtain the desired engineering applications is heating and cooling under effect of controlledsequence of heat treatment. The main aim of this study was to investigate the effect ofheating and cooling on the surface roughness, microstructure and some selected propertiessuch as the hardness and impact strength of Medium Carbon Steel which treated at differenttypes of heat treatment processes. Heat treatment achieved in this work was respectively,heating, quenching and tempering. The specimens were heated to 850°C and left for 45minutes inside the furnace as a holding time at that temperature, then quenching process wasperformed in four types of quenching media (still air, cold water (2°C), oil and polymersolution), respectively. Thereafter, the samples were tempered at 200°C, 400°C, and 600°Cwith one hour as a soaking time for each temperature, then were all cooled by still air. Whenthe heat treatment process was completed, the surface roughness, hardness, impact strengthand microstructure tests were performed. The results showed a change and clearimprovement of surface roughness, mechanical properties and microstructure afterquenching was achieved, as well as the change that took place due to the increasingtoughness and ductility by reducing of brittleness of samples.

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