scholarly journals Flexural Properties and Microstructure Mechanisms of Renewable Coir-Fiber-Reinforced Magnesium Phosphate Cement-Based Composite Considering Curing Ages

Polymers ◽  
2020 ◽  
Vol 12 (11) ◽  
pp. 2556
Author(s):  
Liwen Zhang ◽  
Zuqian Jiang ◽  
Wenhua Zhang ◽  
Sixue Peng ◽  
Pengfei Chen
Keyword(s):  
Flexural Strength ◽  
Waste Treatment ◽  
Bending Test ◽  
Magnesium Phosphate ◽  
Flexural Properties ◽  
Coir Fiber ◽  
X Ray ◽  
Flexural Toughness ◽  
Three Point Bending ◽  
Curing Age

As a renewable natural plant fiber, Coir fiber (CF) can be used to as an alternative to improve poor toughness and crack resistance of magnesium phosphate cement (MPC), replacing such artificial fibers as steel fiber and glass fiber and thereby reducing huge energy consumptions and large costs in artificial fibers’ production and waste treatment. Aiming at examining the effects of CF volume concentrations on MPC flexural properties, this study employed a typical three-point bending test, including thirty cuboid specimens, to investigate the flexural strength, load-deflection behavior, and flexural toughness of MPC with different CF volume concentrations from 0% to 4% at the curing age of seven days and 28 days. Results demonstrated that CF presented similar effects on MPC’s properties at two curing ages. At both curing ages, as CF grew, flexural strength increased first and then decreased; specimen stiffness, i.e., MPC elastic modulus, displayed a decreasing trend; and flexural toughness was improved continuously. Additionally, modern microtesting techniques, such as, scanning electron microscopy (SEM) and energy dispersive X-ray detection (EDX), were adopted to analyze the microstructure and compositions of CF and specimens for explaining the properties microscopically.

scholarly journals Flexural Properties of Renewable Coir Fiber Reinforced Magnesium Phosphate Cement, Considering Fiber Length

Materials ◽  
2020 ◽  
Vol 13 (17) ◽  
pp. 3692 ◽  
Author(s):  
Liwen Zhang ◽  
Zuqian Jiang ◽  
Hui Wu ◽  
Wenhua Zhang ◽  
Yushan Lai ◽  
...  
Keyword(s):  
Flexural Strength ◽  
Waste Treatment ◽  
Bending Test ◽  
Magnesium Phosphate ◽  
Flexural Properties ◽  
Coir Fiber ◽  
X Ray Diffraction ◽  
Flexural Toughness ◽  
Three Point Bending ◽  
Curing Age

Coir fiber (CF), a renewable natural plant fiber, is more competitive in improving poor toughness and crack resistance of magnesium phosphate cement (MPC) than artificial fibers, due to its slight energy consumptions and low costs in production and waste treatment. In this paper, a typical three-point bending test was carried out to study the effects of CF length on MPC flexural properties. A total of forty-two cuboid specimens were employed to investigate the flexural strength, load-deflection behavior, and flexural toughness of MPC, with CF lengths varying from 0 to 30 mm at the curing age of 7 days and 28 days. Results showed that, at both two curing ages, MPC flexural strength first increased with CF length increasing, and then deceased when CF length exceeded the threshold. However, with the increase of CF length, MPC flexural toughness increased continuously, while MPC elastic modulus displayed a decreasing trend. Additionally, Modern micro testing techniques, such as scanning electron microscope (SEM) and X-ray diffraction (XRD), were also used to study the microstructure and phase compositions of specimens for further explaining the themicroscopic mechanism.

scholarly journals Experimentation with Flexural Properties of the Carbon Fiber Graphite Fiber and Glass Fiber Composites

2019 ◽  
Vol 8 (4) ◽  
pp. 4272-4277
Keyword(s):  
Silicon Carbide ◽  
Carbon Fiber ◽  
Flexural Strength ◽  
Glass Fiber ◽  
Composite Plates ◽  
Bending Test ◽  
Filler Material ◽  
Flexural Properties ◽  
Graphite Fiber ◽  
Three Point Bending

In the present work the flexural properties of selected composite plates are examined. The three point bending test happens to be widely acceptable method for the evaluation of flexural properties of the composite plates because of its simple geometry and structure. In this paper the influence of filler material and thickness of laminates under three point bending load on simply supported pins are reported for selected filler material combination. Filler materials used here are Glass fiber epoxy with silicon carbide, Graphite fiber epoxy with silicon carbide and Carbon fiber epoxy with silicon carbide. Investigation is carried out as per ASTM D790 standard. The mechanical properties such as flexural strength, flexural stiffness of the composite plates were investigated and reported. This work broadly points out that the flexural strength is dependent on the thickness of the laminates and amount of the filler material of the laminated composites. It was found that Carbon fiber composite shows the superior flexural strength with 6 wt% of SiC among the specimens under study.

scholarly journals Effect of Coconut Fiber Dosage on Flexural Performances of Magnesium Phosphate Cement

2021 ◽  
Vol 8 ◽  
Author(s):  
Zuqian Jiang ◽  
Liwen Zhang ◽  
Junping Zhang ◽  
Zhuo Sun ◽  
Jing Li
Keyword(s):  
Flexural Strength ◽  
Cementitious Materials ◽  
Cementitious Material ◽  
Bending Test ◽  
Magnesium Phosphate ◽  
Mechanical Behaviors ◽  
Coconut Fiber ◽  
Plant Fiber ◽  
Three Point Bending ◽  
New Type

Magnesium phosphate cement (MPC), as a new type of inorganic cementitious material, has the advantages of fast curing speed and high early strength. However, MPC still exhibits poor toughness similar to other cementitious materials. Coconut fiber (CF), a renewable plant fiber, was found to have the potential to improve the toughness of MPC in our previous research. As a result, further research should be completed to investigate the mechanical behaviors of MPC mixed with CF. This paper focused on the effect of CF volume dosage on MPC’s flexural performances. Flexural strength, load-deflection (L-D) relationship, fractural patterns, and flexural toughness were obtained by carrying out a three-point bending test. The results showed that flexural strength first increased and then decreased with increasing CF dosage, and the optimal CF dosage for flexural strength was 3%. Besides, it could be observed from the L-D relationship that the toughness increased continuously with increasing CF dosage. Additionally, the technique of scanning electron microscopy (SEM) was employed to analyze the microstructure of MPC mixed with different CF dosages.

Preparation and Research on the Lateral Elastic Modulus of the MnO2 Nanowires

2013 ◽  
Vol 662 ◽  
pp. 84-87
Author(s):  
Yong Jiang ◽  
Jian Cheng Deng ◽  
Yan Huai Ding ◽  
Jiu Ren Yin ◽  
Ping Zhang
Keyword(s):  
Elastic Modulus ◽  
Crystal Form ◽  
Bending Test ◽  
X Ray Diffraction ◽  
Nanowire Diameter ◽  
X Ray ◽  
Three Point Bending ◽  
Force Microscopy ◽  
Atomic Force ◽  
Mno2 Nanowires

MnO2 nanowires with large aspect ratio were successfully synthesized via a hydrothermal method. In this method, Mn(NO3)2 was as a source of manganese and NH4NO3 as an oxidant. The structure and morphology of the MnO2 nanowires were characterized by X ray diffraction (XRD) and scanning electron microscope (SEM). Their lateral elastic modulus was characterized via a nanoscale three-point bending test by atomic force microscopy (AFM) equipped with picoforce. The results indicate that the crystal form of MnO2 was β-MnO2. The elastic modulus of the nanowires decreased with the increase in nanowire diameter. This elastic modulus was in the range of 33.36-77.84GPa as the diameter ranged from 240 to 185nm.

Correlation between Process Parameters with Flexural Properties of Hybrid Glass/Jute Fibre Reinforced Epoxy Composite Fabricated via Vacuum Infusion Technique

2015 ◽  
Vol 761 ◽  
pp. 531-535
Author(s):  
Noraiham Mohamad ◽  
Mohd Fadli Hassan ◽  
Siang Yee Chang ◽  
Qumrul Ahsan ◽  
Yuhazri Yaakob ◽  
...  
Keyword(s):  
Epoxy Composite ◽  
Processing Parameters ◽  
Bending Test ◽  
Flexural Properties ◽  
Jute Fibre ◽  
Soaking Time ◽  
Three Point Bending ◽  
Vacuum Infusion ◽  
Supply Pressure ◽  
Infusion Technique

Flexural properties of hybrid glass/jute fibre reinforced epoxy composites were optimised by response surface methodology. The processing parameters of vacuum infusion technique such as supply pressure, soaking time and use of flow media were investigated. The flexural properties of the resulting composites were evaluated using three-point bending test in accordance with the ASTM D790-03 standard. The flexural strength of ~195 MPa and elastic modulus of ~13412 MPa were achieved at optimum parameter of 100 kPa pressure, 120 minutes soaking time with the utilization of flow media during vacuum infusion process.

THE INFLUENCE OF SiC COATING PROCESS ON THE PROPERTIES OF C/C COMPOSITES

2007 ◽  
Vol 14 (04) ◽  
pp. 817-820
Author(s):  
MIN HUANG ◽  
KE-ZHI LI ◽  
HE-JUN LI ◽  
QIAN-GANG FU ◽  
GUO-DONG SUN
Keyword(s):  
Mechanical Properties ◽  
Flexural Strength ◽  
Failure Mode ◽  
Flexural Modulus ◽  
Pack Cementation ◽  
Bending Test ◽  
Carbon Composites ◽  
Coating Process ◽  
Three Point Bending ◽  
Coated Carbon

SiC coating for carbon/carbon composites was prepared by pack cementation method. The effects of coating process on the microstructure and the mechanical properties of C / C composites were analyzed by SEM and three-point bending test, respectively. As the infiltrated Si improved the interfaces bonding during the coating process, the flexural strength and flexural modulus of SiC -coated carbon/carbon composites were both increased by about 10% than the naked C / C composites. In addition, the mechanism of the change of failure mode of SiC coated C / C composites and naked C / C composites was addressed.

scholarly journals Influence of a Repeated Preheating Procedure on Mechanical Properties of Three Resin Composites

2015 ◽  
Vol 40 (2) ◽  
pp. 181-189 ◽  
Author(s):  
M D'Amario ◽  
F De Angelis ◽  
M Vadini ◽  
N Marchili ◽  
S Mummolo ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Flexural Strength ◽  
Vickers Microhardness ◽  
Flexural Modulus ◽  
Bending Test ◽  
Resin Composites ◽  
Three Point Bending ◽  
Main Effect ◽  
Dependent Variables ◽  
Marginal Means

SUMMARY The aim of this study was to assess the flexural strength, flexural elastic modulus and Vickers microhardness of three resin composites prepared at room temperature or cured after one or repeated preheating cycles to a temperature of 39°C. Three resin composites were evaluated: Enamel Plus HFO (Micerium), Opallis (FGM), and Ceram X Duo (Dentsply DeTrey). For each trial, one group of specimens of each material was fabricated under ambient laboratory conditions, whereas in the other groups, the composites were cured after 1, 10, 20, 30, or 40 preheating cycles to a temperature of 39°C in a preheating device. Ten rectangular prismatic specimens (25 × 2 × 2 mm) were prepared for each group (N=180; n=10) and subjected to a three-point bending test for flexural strength and flexural modulus evaluation. Vickers microhardness was assessed on 10 cylindrical specimens from each group (N=180; n=10). Statistical analysis showed that, regardless of the material, the number of heating cycles was not a significant factor and was unable to influence the three mechanical properties tested. However, a significant main effect of the employed material on the marginal means of the three dependent variables was detected.

Verification of Numerical Model for Trabecular Tissue Using Compression Test and Time-Lapse X-Ray Radiography Based on Material Model Determined from Three-Point Bending Test of Single Trabecula

2013 ◽  
Vol 586 ◽  
pp. 265-269 ◽  
Author(s):  
Petr Zlámal ◽  
Tomáš Doktor ◽  
Ondřej Jiroušek ◽  
Ivan Jandejsek
Keyword(s):  
Compression Test ◽  
Plastic Material ◽  
Material Model ◽  
Cylindrical Sample ◽  
Bending Test ◽  
Micro Computed Tomography ◽  
Fe Method ◽  
X Ray ◽  
Three Point Bending ◽  
Complex Sample

The aim of this study is to determine constitutive constants for elasto-plastic material model with damage for single trabecula based on the indirect simulation of micromechanical testing and its verification at macro level using compression test of the cylindrical sample of the trabecular tissue. Three-point bending test of isolated trabeculae was performed in a shielding box and deflection of the sample was acquired using X-ray microradiography. Measured values (displacements of markers) were used for indirect identification of the material model for single trabecula using finite element (FE) method. The bending test was simulated and results were fitted to experimentally obtained values and the appropriate set of material constants was determined. To verify the applicability of the identified material model the compression test of the complex sample was carried out. Cylindrical sample was incrementally loaded and each loading state was captured using the micro-computed tomography. Material model identified from three-point bending test was applied to the model of complex sample and the simulation of the compression test was performed.

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