scholarly journals Effect of Curing on the Tensile and Flexural Performance of Fully Biodegradable Corn Starch/Areca Frond Composites

2015 ◽  
Vol 2015 ◽  
pp. 1-7 ◽  
Author(s):  
Srinivas Shenoy Heckadka ◽  
Suhas Yeshwant Nayak ◽  
Manjeshwar Vijaya Kini ◽  
Revati Chowgule ◽  
Pranay Jain
Keyword(s):  
Flexural Strength ◽  
Corn Starch ◽  
Weight Ratio ◽  
High Strength ◽  
Surface Characteristics ◽  
Compression Moulding ◽  
Flexural Performance ◽  
Hot Air ◽  
Structural Applications ◽  
Unidirectional Fibre

Composites have monopolized the automotive, construction, and packaging industry. Their high strength to weight ratio has made them an integral part of numerous engineering applications. In this study biodegradable matrix is combined with areca frond fibres for developing composites for low strength structural applications. Areca frond fibres were extracted and treated with sodium bicarbonate to improve the surface characteristics. Hand lay-up and compression moulding techniques were used to fabricate composites having unidirectional fibre orientation. The specimens prepared were exposed to varied environments, namely, sunlight, OTG oven, steam oven, and hot air oven, for curing and the results were analyzed to best suit the implicated requirements. Scanning electron microscopy was used to observe the changes in surface characteristics of the frond fibres after treatment. Tensile and flexural strength of starch based/areca frond reinforced composites were evaluated according to ASTM standards. Test results revealed that composites cured in a steam oven resulted in improved tensile and flexural strength compared to other curing environments.

ADDITIVE MANUFACTURING PARAMETERS OPTIMIZATION OF Ti6AL4V ELI FOR MEDICAL IMPLANTS

2022 ◽  
Author(s):  
VIJAY KUMAR MEENA ◽  
PARVEEN KALRA ◽  
RAVINDRA KUMAR SINHA
Keyword(s):  
Surface Roughness ◽  
Additive Manufacturing ◽  
Weight Ratio ◽  
High Strength ◽  
Surface Characteristics ◽  
Parameters Optimization ◽  
Medical Implants ◽  
Scan Speed ◽  
Grey Relational ◽  
Manufacturing Parameters

Additive manufacturing (AM) of titanium (Ti) alloys has always fascinated researchers owing to its high strength to weight ratio, biocompatibility, and anticorrosive properties, making Ti alloy an ideal candidate for medical applications. The aim of this paper is to optimize the AM parameters, such as Laser Power (LP), Laser Scan Speed (LSS), and Hatch Space (HS), using Analysis of Variance (ANOVA) and Grey Relational analysis (GRA) for mechanical and surface characteristics like hardness, surface roughness, and contact angle, of Ti6Al4V ELI considering medical implant applications. The input parameters are optimized to have optimum hardness, surface roughness and hydrophilicity required for medical implants.

Fatigue in Ti-6Al-4V at Very High Cycles

2007 ◽  
Vol 561-565 ◽  
pp. 259-262 ◽  
Author(s):  
X.J. Cao ◽  
M.R. Sriraman ◽  
Qing Yuan Wang
Keyword(s):  
Fatigue Testing ◽  
Fatigue Behavior ◽  
Weight Ratio ◽  
High Strength ◽  
Ambient Air ◽  
Ti Alloys ◽  
Structural Applications ◽  
Ultrasonic Fatigue ◽  
Reversed Loading ◽  
Very High

The importance of determining and understanding the very high cycle fatigue behaviors of materials has gained strength in recent years. Ti-alloys, in view of their high strength-to-weight ratio, have a range of structural applications. Of these, Ti-6Al-4V, belonging to the alpha-beta type is the most widely used. The present paper deals with investigations on the fatigue behavior of TC4, the Chinese equivalent to Ti-6Al-4V, up to very high cycles. Fatigue testing was carried out on a piezoelectric ultrasonic fatigue machine operating at 20 kHz frequency. Hourglass shaped resonant specimens were tested in ambient air at room temperature under completely reversed loading conditions (R = -1). Failure in the alloy was seen to occur right up to the gigacycle regime, with the fractures being found to initiate from the surface unlike in steels. The fracture surfaces exhibit brittle characteristics containing river patterns and cleavage facets, as well as striations.

Evaluation of Mechanical Properties of Acacia-Jute-Sisal-Glassfibrereinforced Composite

2015 ◽  
Vol 813-814 ◽  
pp. 51-56 ◽  
Author(s):  
C. Elanchezhian ◽  
B. Vijaya Ramnath ◽  
V. Ramanan ◽  
R. Saisundararam ◽  
C.S. Siddarth
Keyword(s):  
Impact Test ◽  
Weight Ratio ◽  
High Strength ◽  
Light Weight ◽  
Compression Moulding ◽  
Environment Friendly ◽  
Two Samples ◽  
Automobile Components ◽  
Maximum Content ◽  
Composite Samples

Now-a-days traditional materials are replacing the natural fibres in automobile components like dashboards, seat-backs and interior trims due to its properties like light weight, environment friendly, good stiffness and high strength to weight ratio . In the study three different continuous fibres, Acacia, Jute and Sisal were mixed in varying proportion with GFRP and epoxy resin on a determined ratio basis to get three different composite samples. These fibres were alkaline treated and moulded using compression moulding and hand lay-up technique. These samples were tested for their Tensile and Impact strengths to find the specimen with higher strength. Scanning Electron Microscope (SEM) test was also conducted to study the structure of all three specimens after tensile test. The study concludes that the sample ‘A’ which has maximum content of sisal has higher tensile strength than other two samples. Similarly impact test concludes that specimen ‘B’ and ‘C’ which has maximum content of Jute and Acacia has equal and higher strength.

Design, Fabrication and Experimental Analysis of Pandanus Fibre Reinforced Polyester Composite

2014 ◽  
Vol 984-985 ◽  
pp. 253-256
Author(s):  
G. Veerakumar Vigneshwaran ◽  
Iyyadurai Jenish ◽  
Rajeshwaran Sivasubramanian
Keyword(s):  
Weight Ratio ◽  
Composite Plates ◽  
High Strength ◽  
Natural Fibre ◽  
Compression Moulding ◽  
Weight Percentage ◽  
Pine Tree ◽  
Water Treatment Process ◽  
Polyester Composite ◽  
Screw Pine

Due to the light weight, high strength to weight ratio, corrosion resistance and other advantages, natural fibre based composites are becoming important composite materials in mechanical engineering fields. The current project emphasizes the newly identified Pandanus Fibre (Pandanus Fascicularis) which is extracted from the stem of screw pine tree by the manual water treatment process. The mechanical properties of chopped Pandanus fibre by Polyester composites are investigated and compared with the similar natural fibres in the fibre reinforced composite material field. The composite plates were fabricated with raw pandanus fibres by compression moulding method with varying weight percentage and lengths of fibre.

scholarly journals A Design Comparison of Castellated Beam for Different Parameters

10.29007/cz65 ◽  
2018 ◽  
Author(s):  
Vimlesh Agrawal ◽  
Darshana Bhatt
Keyword(s):  
Parametric Study ◽  
Weight Ratio ◽  
High Strength ◽  
Moment Of Inertia ◽  
High Moment ◽  
Length Ratio ◽  
Geometric Condition ◽  
Structural Applications ◽  
Castellated Beam ◽  
Design Comparison

Castellated Beams made from steel I Sections are being extensively used in structural applications because it has high moment of inertia and high strength to weight ratio. This paper is concerned with the comparison of castellated beam with solid beam, also carried out for same loading and geometric condition. Parametric study is done by changing various parameters of castellated beam like shape of opening, welded length, ratio of depth of opening to total depth and angle of cut. By comparing castellated beam with solid beam it is concluded that solid beam required higher section.

Carbon/Carbon Composites: Fabrication and Properties and Selected Experiences

1988 ◽  
Vol 125 ◽  
Author(s):  
Richard C. Dickinson
Keyword(s):  
Mechanical Properties ◽  
Oxidation Rate ◽  
Elevated Temperatures ◽  
Weight Ratio ◽  
Physical And Mechanical Properties ◽  
High Strength ◽  
Carbon Composites ◽  
Oxidation Protection ◽  
Structural Applications ◽  
Protection Systems

ABSTRACTCarbon/Carbon is a highly desirable material for use at elevated temperatures in structural applications due to its high strength-to-weight ratio and increasing strength with increasing temperatures.This presentation will survey the general methods used to fabricate and apply oxidation protection systems to these composites. This will be followed by an overview of typical physical and mechanical properties and selected results from oxidation rate studies.

scholarly journals The Efficiency of Utilisation of High-strength Steel in Tubular Profiles

Materials ◽  
2020 ◽  
Vol 13 (5) ◽  
pp. 1193 ◽  
Author(s):  
Ieva Misiūnaitė ◽  
Viktor Gribniak ◽  
Arvydas Rimkus ◽  
Ronaldas Jakubovskis
Keyword(s):  
Bearing Capacity ◽  
Cross Section ◽  
High Strength Steel ◽  
Current Trend ◽  
Weight Ratio ◽  
High Strength ◽  
Beam Specimen ◽  
Load Bearing Capacity ◽  
Load Bearing ◽  
Structural Applications

The use of high-strength steel (HSS) is a current trend of the construction industry. Tubular profiles are widely used in various structural applications because of their high stiffness-to-weight ratio, exceptional resistance to torsion, and aesthetic appearance. However, the increase of the strength for the same elastic modulus of the material and geometry of tubular profiles is often not proportional to the rise of the load-bearing capacity of the structural element. The obtained experimental results support the above inference. The study was based on the flexural test results of two groups of HSS and normal-strength steel (NSS) tubular specimens with a 100 × 100 × 4 mm (height × width × thickness) cross-section. Numerical (finite element) simulation results demonstrated that the shape of the cross-section influenced the efficiency of utilisation of HSS. The relationship between the relative increase of the load-bearing capacity of the beam specimen and the corresponding change of the steel strength determined the utilisation efficiency.

Analysis of Mechanical Properties on Roselle Fibre with Polymer Matrix Reinforced Composite

2016 ◽  
Vol 16 ◽  
pp. 1-6 ◽  
Author(s):  
S. Nallusamy
Keyword(s):  
Mechanical Properties ◽  
Composite Materials ◽  
Matrix Composite ◽  
Polymer Matrix ◽  
Weight Ratio ◽  
High Strength ◽  
Strength Properties ◽  
Reinforced Composite ◽  
Composite Field ◽  
Structural Applications

Over the past two decades it has been established that composite materials are the leading emerging materials. The natural fibres present a number of advantages over traditional synthetic fibres because of their better corrosion resistance, excellent thermo-mechanical properties and high strength to weight ratio. Also the composite materials play an important role in maintaining the eco-friendly design requirements. Among this, polymer matrix composite is one of the recent developing sectors on the composite field, because it has high strength with less density as compared to the metal matrix composite. Depending on the applications, the properties of the polymer reinforced composite are improved by modifying compositions, process of fabrication and direction of fibre etc. In this analysis the Roselle Fibre (Hibiscus Sabdariffa) is reinforced with polymer composite by wt % in the mode of compression molding. The mechanical properties of the above fabricated material were analyzed by ASTM Standards and also the characterization of polymer composites were analysed using SEM. The compressive strength and the hardness value were high as compared to other strength properties; hence it is more suitable for compressive and structural applications. The results concluded that the treated fibre with chemical reveals better compatibility with polymer matrix than that of untreated fibre.

scholarly journals Effect of Cryogenic Treatment on Bisphenol Based Polymer Composite on Mechanical Properties

2019 ◽  
Vol 8 (3) ◽  
pp. 2416-2420
Keyword(s):  
Tensile Strength ◽  
Composite Materials ◽  
Flexural Strength ◽  
Cryogenic Treatment ◽  
Specific Property ◽  
Weight Ratio ◽  
High Strength ◽  
Cost Effective ◽  
Basic Part ◽  
Weight Percentage

Presently there are lot of materials that can be used in the fabrication of any item, so choosing a material is a major criteria. So the materials are chosen depending on the properties desired by the resulting item. The composite materials have better properties when compared with its individual components, metals and ceramics. The overall appeal of the product depends mainly on its durability, aesthetics and its final cost. Composite materials are cost effective and significantly satisfy the needs of the clients. By utilizing composite materials we can obtain high strength to weight ratio at a relatively economical cost. Moreover, they can be produced easily by basic part forming. Hybrid polymer composites have been studied of late which improves a specific property of the composite that is under question. Here a hybrid composite made of laminate of Nomex and HS glass sheets with varying percentage (1% - 2.5 %) of bisphenol dispersed in resin is prepared. The same samples were subjected to cryogenic treatment (24 hrs and 72 hrs). The results of tensile strength, flexural strength and hardness were compared for all the specimens 24 hrs cryogenic, 72hrs cryogenic and non-treated specimens. The results showed that the hardness of the cryogenic treated bisphenol based PMCs has increased with the weight percentage of Bisphenol indicating the fact that the laminates can withstand more loads at subzero temperatures The increase observed was about 3 – 4 % more in terms of BHN number. At the same time the tensile and flexural strengths have considerably reduced after treating the PMC cryogenically as the laminates becomes more brittle when treated. The tensile strength increased by about 10% approximately and the flexural strength reduced by 300%.

scholarly journals Fiber Reinforced Compressed Earth Blocks: Evaluating Flexural Strength Characteristics Using Short Flexural Beams

Materials ◽  
2021 ◽  
Vol 14 (22) ◽  
pp. 6906
Author(s):  
Peter Donkor ◽  
Esther Obonyo ◽  
Christopher Ferraro
Keyword(s):  
Flexural Strength ◽  
Fiber Reinforced Concrete ◽  
Test Method ◽  
Peak Strength ◽  
Fiber Reinforced ◽  
Ongoing Research ◽  
Flexural Performance ◽  
Structural Applications ◽  
Compressed Earth Blocks ◽  
Earth Blocks

There are ongoing research efforts directed at addressing strength limitations of compressed earth blocks (CEB) that inhibit their deployment for structural applications, particularly in areas where masonry systems are regularly subjected to lateral loads from high winds. In this paper, the authors focus specifically on the extent to which polypropylene (PP) fibers can be used to enhance the flexural performance of CEB. Cementitious matrices used for CEB production exhibit low tensile and flexural strength (brittle) properties. This work investigates plain (unreinforced) and fiber-reinforced specimens (short flexural beams) with fiber mass content of 0.2, 0.4, 0.6, 0.8, and 1.0% and ordinary Portland cement (OPC) content of 8%. The influence of the inclusion of fiber was based on tests conducted using the Standard Test Method for Flexural Performance of Fiber-Reinforced Concrete (ASTM C1609). Material properties that were quantified included first-peak strength, peak strength, equivalent flexural strength, residual strength, and flexural toughness. There was an observed improvement in the performance of the soil-fiber matrixes based on these results of these tests. It was also observed that when the fiber content exceeded 0.6% and above, specimens exhibited a deflection- hardening behavior; an indication of improvement in ductility. An equivalent flexural strength predictive model is proposed.

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