scholarly journals Mechanical Properties of Short and Continuous Kenaf/Pet Fibre Reinforced Polyoxymethylene Composite

2015 ◽  
Vol 24 (4) ◽  
pp. 096369351502400 ◽  
Author(s):  
Yakubu Dan-mallam ◽  
Mohamad Zaki Abdullah ◽  
Puteri Sri Melor Megat Yusoff
Keyword(s):  
Mechanical Properties ◽  
Tensile Strength ◽  
Hybrid Composite ◽  
Positive Impact ◽  
Natural Fibers ◽  
Fibre Length ◽  
Primary Objective ◽  
Impact Properties ◽  
Kenaf Composites ◽  
The Impact

The challenges of improving the mechanical properties of natural fibre composites cannot be over emphasized due to fibre geometry, poor fiber distribution in the matrix, the hydrophilic nature of natural fibers and poor fibre–matrix interfacial adhesion. The primary objective of this research is to study the influence of fibre length on mechanical properties of kenaf/PET fibre reinforced POM and to study the effect of hybridization on mechanical properties of the composites. The composites were produced by compression molding and subsequently subjected to tensile, flexural and impact tests according to their respective ASTM standards. The tensile strength of short POM/kenaf/PET (80/10/10) hybrid composite dropped by approximately 33% from 61.8 MPa to 41.3 MPa compared to neat POM. However, the tensile strength of continuous POM/kenaf composites increased significantly by approximately 127% and 107% for 70/30 and 80/20 compositions compared to neat POM. The flexural moduli of short POM/kenaf/PET (70/15/15) hybrid composite and continuous POM/kenaf (70/30) composite improved by approximately 41% and 29%, respectively. The impact strength substantially increased by nearly 161% in continuous POM/kenaf/PET (70/15/15) hybrid composite and 30% in POM/kenaf (80/20) composite. The results show that tensile, flexural and impact properties of the continuous POM/kenaf composites are superior to the short fiber composites, and the influence of hybridization, made a positive impact by enhancing the flexural and impact properties of the composites.

Investigation of Heat Treatment on Mechanical Properties of SAE4320 and SAE8620 Alloys

2013 ◽  
Vol 834-836 ◽  
pp. 816-819 ◽  
Author(s):  
Li Jun Tan ◽  
Jun Qiao Wang ◽  
Qing Qun Wang ◽  
Xin Long Chen ◽  
Si Zhu Zhou
Keyword(s):  
Mechanical Properties ◽  
Heat Treatment ◽  
Tensile Strength ◽  
Impact Toughness ◽  
Deformation Property ◽  
New Product ◽  
Heat Treatments ◽  
Impact Properties ◽  
The Impact

The tensile and impact properties of SAE4320 and SAE8620 alloys were investigated. Various heat treatments were applied to these two alloys, including different pre-heat treatment. The results shown that after Carburizing and Quenching, both SAE4320 and SAE8620 alloys were highly sensitively to V-notches for their impact samples. In any case, SAE4320 alloy revealed higher tensile strength, better impact toughness and deformation property. Previous work shown that after Carburizing and Quenching, the impact toughness of SAE8620 alloy was too low, the products made of it was very dangerous. Based on the results, a new advanced product was made of SAE4320 alloy instead of SAE8620 alloy. And the new product exhibited good properties. The impact value of the new product far exceeded the older products.

scholarly journals Fabrication of Epoxy Composites Reinforced with Bamboo Fibers

2020 ◽  
pp. 1-7
Author(s):  
Mohammed Khazal ◽  
Salman H. Abbas ◽  
Younis M. Younis ◽  
Thabit Jamel
Keyword(s):  
Mechanical Properties ◽  
Tensile Strength ◽  
Impact Strength ◽  
Bending Strength ◽  
Natural Fiber ◽  
Natural Fibers ◽  
Percentage Increase ◽  
High Mechanical Strength ◽  
Bamboo Fibers ◽  
The Impact

This study aims to enhance the mechanical properties of polymer material using type of natural fiber. Bamboo fiber considered the strongest between the natural fibers group, it have low density, high mechanical strength in addition to its availability makes it economically viable and have potential for used as engineering material. The study is concerned with evaluate some of the mechanical properties (Tensile strength, Bending strength, Impact strength) for the resultant composite reinforced with 10, 20 and 30 vol.% of bamboo fibers, as compared with received material. With the natural reinforcement, the optimum mechanical properties in comparison with the as received epoxy were achieved. The results indicated that the tensile strength increased from 13.51 MPa to 33.50 MPa (that is a percentage increase of 150 %), also the bending strength increased from 24.25 MPa to 44.5 MPa (that is a percentage increase about 83 %), as well as, the increase of the impact strength from 41 kJ/m2 to 69 kJ/m2 (that is a percentage increase about 68 %).

Processing and Evaluation of Mechanical Properties of Coconut Coir and Rice Husk Reinforced Natural Hybrid Composites

2019 ◽  
Vol 895 ◽  
pp. 176-180
Author(s):  
C.K. Yogish ◽  
S. Pradeep ◽  
B. Kuldeep ◽  
K.P. Ravikumar ◽  
Rao R. Raghavendra
Keyword(s):  
Mechanical Properties ◽  
Tensile Strength ◽  
Composite Materials ◽  
Flexural Strength ◽  
Rice Husk ◽  
Hybrid Composites ◽  
Natural Fibers ◽  
Coir Fiber ◽  
Coconut Coir ◽  
The Impact

Over the last decades composite materials, plastics and ceramics have been the dominant emerging materials. The volume and number of applications of composite materials have grown steadily, penetrating and conquering new markets relentlessly. So everybody is concentrating on new materials which will be strong enough, less weight, recyclable with reduced cost. Hence all the researchers are concentrated on the composite materials which have all the above properties. The present work is concentrated on coconut coir fiber and Rice husk reinforced polyester hybrid composites. The composites specimen was fabricated with various weight percentages of natural fibers namely coconut coir (20%, 15%, 10%, and 5%) and Rice husk (15%, 10%, and 5%) combined with CamElect 3321 resin using hand lay-up method. So to obtain new composite materials different proportions of coconut coir and Rice husk is added and the mechanical properties such as Tensile strength, Flexural Strength and Impact test were carried out for the samples cut from the fabricated composites specimen to the dimensions as per ASTM standard. With the increasing percentage of the reinforcements the performance of the material is improving. The tensile strength increases with the increase in coir reinforcement percentage and flexural strength increases with the increasing in percentage of the rice husk and the impact strength of the material gets boost with equal proportional percentage of coconut coir and rice husk reinforcement.

Effect of surface treatment on moisture absorption, thermal, and mechanical properties of sisal fiber

2020 ◽  
pp. 152808372092477 ◽  
Author(s):  
Adane Dagnaw Gudayu ◽  
Leif Steuernagel ◽  
Dieter Meiners ◽  
Rotich Gideon
Keyword(s):  
Mechanical Properties ◽  
Thermal Stability ◽  
Tensile Strength ◽  
Moisture Absorption ◽  
Natural Fibers ◽  
Alkaline Treatment ◽  
Automotive Application ◽  
Sisal Fiber ◽  
Thermal And Mechanical Properties ◽  
The Impact

Natural fibers are increasingly being used as composite reinforcement for both thermoplastic and thermoset resin, mainly for automotive application. Due to their hydrophilic nature, natural fibers have certain limitations during composite manufacture especially owing to their poor resin wettability, weak fiber–polymer interface, high moisture absorption, and being affected by high temperature in case of thermoplastic resin. This work investigates the impact of sisal fiber modification techniques on moisture absorption, thermal, and mechanical properties of the fiber. Four sisal fiber samples were prepared; untreated, alkaline treated, acetylated, and a combined alkaline-treated/acetylation samples. The samples were evaluated for their hygroscopic nature, thermal stability, and tensile properties. It is found that acetylation resulted in a reduction of moisture absorption of sisal fiber as the acetylated and alkaline-treated/acetylated samples recorded a decrease of 42% and 28%, respectively. Alkaline treatment increased the absorbency owing to the removal of hemicellulose and lignin. The thermogravimetric result revealed that alkaline treatment improved the thermal stability as the alkali-treated and alkali-treated/acetylated samples showed improvement in thermal properties. The acetylated sample resulted in a significant reduction in tensile strength. But, the results from tensile tests of the alkaline-treated samples showed an insignificant decrease in tensile strength and improvement in the modulus for all treated samples. Fourier-transform infrared and scanning electron microscopic analysis were included in the study to supplement the results with structural and microstructural changes. The effect of those treatments on the sisal–PET composite properties was studied and will be submitted in part 2 of the study.

Mechanical Properties and Failure Analysis of Short Kenaf Fibre Reinforced Composites Processed by Resin Casting and Vacuum Infusion Methods

2018 ◽  
Vol 26 (2) ◽  
pp. 189-204 ◽  
Author(s):  
T.P. Mohan ◽  
K. Kanny
Keyword(s):  
Mechanical Properties ◽  
Fibre Length ◽  
Barrier Properties ◽  
Short Fibre ◽  
Impact Properties ◽  
Kenaf Fibre ◽  
Banana Fibre ◽  
The Impact ◽  
Properties Of Composites ◽  
Kenaf Fibres

Modified and unmodified short kenaf fibre reinforced epoxy composites were processed with different short fibre lengths and fibre concentrations by resin casting (RC) and vacuum-assisted resin infusion (VARIM) methods. Three types of kenaf fibres were reinforced in epoxy polymer, namely, untreated kenaf fibre, mercerised and nanoclay-infused kenaf fibres. The mechanical properties such as tensile, flexural and impact properties of composites were studied. Nanoclay infused kenaf fibres have shown better tensile, flexural and impact properties than those of untreated and mercerised fibres. The composites processed by VARIM possess improved tensile and flexural properties when compared with RC composites, whereas the impact properties were better in RC composites than those of VARIM processed composites. The results showed that the mechanical properties of composites depend on the short fibre length and fibre concentration, irrespective of the processing conditions. Improved water barrier properties were also obtained in nanoclay-treated banana fibre composites.

scholarly journals Studies on Mechanical Properties of Kevlar/Napier Grass Fibers Reinforced with Polymer Matrix Hybrid Composite

2021 ◽  
Vol 2021 ◽  
pp. 1-9
Author(s):  
R. Ganesamoorthy ◽  
R. Meenakshi Reddy ◽  
T. Raja ◽  
Pradeep Kumar Panda ◽  
Sneha H. Dhoria ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Compression Strength ◽  
Hybrid Composite ◽  
Hybrid Composites ◽  
Matrix Material ◽  
Natural Fibers ◽  
Negative Influence ◽  
Napier Grass ◽  
Synthetic Fibers ◽  
The Impact

A percentage of natural fibers is used for developing a composite, the materials are quite increasing in recent trends, and they can be a potential replacement of synthetic fibers in the reinforcement phase of hybrid composite. In this research, the combination of natural fibers and synthetic fibers can be used as reinforcement, and epoxy polymer can be used as matrix material. The fibers of Kevlar and Napier grass are reinforced with epoxy matrix to develop a new composite by using conventional hand layup fabrication process and to quantify the effect of this hybrid composite laminate, with five different sequences following. To identify the mechanical properties of this hybrid composite through tensile, flexural, compression strength, impact strength, and hardness tests, among all five samples, sample A was given the maximum mechanical strength, such that the tensile strength is 210 MPa, flexural strength is 165 MPa, the impact energy absorption is 23 J, the average is 40% over the other samples, and, at the same time, the compression strength of sample E is 19 MPa, revealing the negative influence of hybrid composite. The SEM morphology was carried out to identify the failure mode of the hybrid composites.

A novel method of increasing ceramic shell permeability and optimizing casting shrinkage and tensile strength of the investment cast parts

2016 ◽  
Vol 231 (3) ◽  
pp. 377-388 ◽  
Author(s):  
Sarojrani Pattnaik ◽  
Pradeep K Jha ◽  
D Benny Karunakar
Keyword(s):  
Mechanical Properties ◽  
Tensile Strength ◽  
Positive Impact ◽  
Research Work ◽  
Casting Process ◽  
Electromagnetic Stirring ◽  
Cast Part ◽  
Investment Cast ◽  
Novel Method ◽  
The Impact

This study explores about enhancing the permeability of the ceramic shells used in the investment casting process using cheaply available sawdust particles. An increase in shell’s permeability augments the cooling rate of the casting which enhances its mechanical properties. It was found that the inclusion of sawdust particles into the ceramic slurries exhibited positive impact on the shell’s permeability. It is a well-known fact that electromagnetic stirring process increases the mechanical properties of the castings, but its effect on casting shrinkage has never been realized. Thus, this study further throws light on the impact of electromagnetic stirring in reducing the shrinkage and improving the tensile strength of the casting. In a nutshell, it was found that the final product quality of the investment cast part improved by the combinational treatments adopted in this research work.

Effect of combined drink cans and steel fibers on the impact resistance and mechanical properties of concrete

2020 ◽  
Vol 14 (2) ◽  
pp. 6734-6742
Author(s):  
A. Syamsir ◽  
S. M. Mubin ◽  
N. M. Nor ◽  
V. Anggraini ◽  
S. Nagappan ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Tensile Strength ◽  
Compressive Strength ◽  
Reinforced Concrete ◽  
Impact Resistance ◽  
Fiber Reinforced Concrete ◽  
Steel Fibers ◽  
Fiber Reinforced ◽  
Indirect Tensile ◽  
The Impact

This study investigated the combine effect of 0.2 % drink cans and steel fibers with volume fractions of 0%, 0.5%, 1%, 1.5%, 2%, 2.5% and 3% to the mechanical properties and impact resistance of concrete. Hooked-end steel fiber with 30 mm and 0.75 mm length and diameter, respectively was selected for this study.  The drinks cans fiber were twisted manually in order to increase friction between fiber and concrete. The results of the experiment showed that the combination of steel fibers and drink cans fibers improved the strength performance of concrete, especially the compressive strength, flexural strength and indirect tensile strength. The results of the experiment showed that the combination of steel fibers and drink cans fibers improved the compressive strength, flexural strength and indirect tensile strength by 2.3, 7, and 2 times as compare to batch 1, respectively. Moreover, the impact resistance of fiber reinforced concrete has increase by 7 times as compared to non-fiber concretes. Moreover, the impact resistance of fiber reinforced concrete consistently gave better results as compared to non-fiber concretes. The fiber reinforced concrete turned more ductile as the dosage of fibers was increased and ductility started to decrease slightly after optimum fiber dosage was reached. It was found that concrete with combination of 2% steel and 0.2% drink cans fibers showed the highest compressive, split tensile, flexural as well as impact strength.    

scholarly journals Damage Evolution of Granodiorite after Heating and Cooling Treatments

Minerals ◽  
2021 ◽  
Vol 11 (7) ◽  
pp. 779
Author(s):  
Mohamed Gomah ◽  
Guichen Li ◽  
Salah Bader ◽  
Mohamed Elkarmoty ◽  
Mohamed Ismael
Keyword(s):  
Mechanical Properties ◽  
Tensile Strength ◽  
Failure Mode ◽  
Physical And Mechanical Properties ◽  
P Wave ◽  
Physical Parameters ◽  
Slow Cooling ◽  
Heating And Cooling ◽  
Natural Rock ◽  
The Impact

The awareness of the impact of high temperatures on rock properties is essential to the design of deep geotechnical applications. The purpose of this research is to assess the influence of heating and cooling treatments on the physical and mechanical properties of Egyptian granodiorite as a degrading factor. The samples were heated to various temperatures (200, 400, 600, and 800 °C) and then cooled at different rates, either slowly cooled in the oven and air or quickly cooled in water. The porosity, water absorption, P-wave velocity, tensile strength, failure mode, and associated microstructural alterations due to thermal effect have been studied. The study revealed that the granodiorite has a slight drop in tensile strength, up to 400 °C, for slow cooling routes and that most of the physical attributes are comparable to natural rock. Despite this, granodiorite thermal deterioration is substantially higher for quick cooling than for slow cooling. Between 400:600 °C is ‘the transitional stage’, where the physical and mechanical characteristics degraded exponentially for all cooling pathways. Independent of the cooling method, the granodiorite showed a ductile failure mode associated with reduced peak tensile strengths. Additionally, the microstructure altered from predominantly intergranular cracking to more trans-granular cracking at 600 °C. The integrity of the granodiorite structure was compromised at 800 °C, the physical parameters deteriorated, and the rock tensile strength was negligible. In this research, the temperatures of 400, 600, and 800 °C were remarked to be typical of three divergent phases of granodiorite mechanical and physical properties evolution. Furthermore, 400 °C could be considered as the threshold limit for Egyptian granodiorite physical and mechanical properties for typical thermal underground applications.

scholarly journals The Structure and Mechanical Properties of Hemp Fibers-Reinforced Poly(ε-Caprolactone) Composites Modified by Electron Beam Irradiation

2021 ◽  
Vol 11 (12) ◽  
pp. 5317
Author(s):  
Rafał Malinowski ◽  
Aneta Raszkowska-Kaczor ◽  
Krzysztof Moraczewski ◽  
Wojciech Głuszewski ◽  
Volodymyr Krasinskyi ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Tensile Strength ◽  
Electron Beam ◽  
Impact Strength ◽  
Flexural Modulus ◽  
Natural Fibers ◽  
High Energy ◽  
Electron Radiation ◽  
Elongation At Break ◽  
Hemp Fibers

The need for the development of new biodegradable materials and modification of the properties the current ones possess has essentially increased in recent years. The aim of this study was the comparison of changes occurring in poly(ε-caprolactone) (PCL) due to its modification by high-energy electron beam derived from a linear electron accelerator, as well as the addition of natural fibers in the form of cut hemp fibers. Changes to the fibers structure in the obtained composites and the geometrical surface structure of sample fractures with the use of scanning electron microscopy were investigated. Moreover, the mechanical properties were examined, including tensile strength, elongation at break, flexural modulus and impact strength of the modified PCL. It was found that PCL, modified with hemp fibers and/or electron radiation, exhibited enhanced flexural modulus but the elongation at break and impact strength decreased. Depending on the electron radiation dose and the hemp fibers content, tensile strength decreased or increased. It was also found that hemp fibers caused greater changes to the mechanical properties of PCL than electron radiation. The prepared composites exhibited uniform distribution of the dispersed phase in the polymer matrix and adequate adhesion at the interface between the two components.

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