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Venkatesha B K ¹, Deepak Kumar T ², B S Shivashankara ³, Sanman S ⁴

Affiliations
1 School of Mechanical Engineering, REVA University, IN
2 Department of Mechanical Engineering, UVCE, Bangalore University, IN
3 Department of Automobile Engineering, AIT, Bengaluru 560107, IN
4 Department of Mechanical Engineering, UVCE, Bangalore University, IN

Abstract

This paper presents the moisture absorption behaviour and its influence on mechanical properties of cenosphere filled hybrid bamboo-glass fiber reinforced epoxy composites (BGFRECs). The hand lay-up technique has been adopted with various weight percentages (0.5, 1.0, 1.5, and 2.0) of cenosphere as a filler content. The moisture absorption tests conducted in distilled-water, and saline-water for 10 days at room temperature. With the help of ASTM standards, the moisture absorption and mechanical properties of these composites have been estimated. The tensile and flexural strengths found to increase when filler percentage increases in different environmental treatments. The obtained results revealed that the cenosphere filler loading has a great impact on the moisture absorption and mechanical properties of the hybrid BGFRECs. However, the influence of moisture absorption presented a substantial drop in the mechanical properties of all the hybrid composites.

Keywords

Bamboo and glass fiber, cenosphere filler, hand lay-up, mechanical properties, moisture absorption

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Sanman S ¹, Prashanth K P ², Venkatesha B K ³, Yuvaraj L ²

Affiliations
1 Department of Mechanical Engineering, Acharya Institute of Technology, Bengaluru, IN
2 Department of Automobile Engineering, Acharya Institute of Technology, Bengaluru, IN
3 Department of Mechanical Engineering, Alva’s Institute of Engineering and Technology, Moodabidire, REVA University, Bangalore, IN

Abstract

Aluminum based composites are generally used to build marine structures and liquid cargo containers because of its high strength and low weight. In the present investigation, the corrosion behaviour of B₄C particle reinforced Al-6061 alloy has been studied. The aluminumboron carbide composite were prepared using stir casting method by varying percentage of reinforcement from 6 to 12% in steps of 2%. Salt spray method was adopted to investigate the corrosion behaviour of the composite. The test was conducted for a period of 240 hours and for every 48 hours the weight loss of the specimens was measured. The extent of corrosion was measured by using weight loss method. The results showed that the corrosion resistance of the composite decreases with the increase in the percentage of boron carbide particulates. The optical microscope was used to analyze the corroded surfaces and corrosion mechanism. The pit initiation side tends to the possibility of the accuracy corrosion on the interface between the hard reinforced particles and matrix alloy.

Keywords

Corrosive, stir casting, aluminum alloy, boron carbide, metal matrix composites.

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Prashanth K P ¹, Venkatesha B K ², Sanman S ³, Venkatesh N ⁴

Affiliations
1 Department of Automobile Engineering, Acharya Institute of Technology, Bengaluru, IN
2 School of Mechanical Engineering, REVA University, Bengaluru, IN
3 Department of Mechanical Engineering, Acharya Institute of Technology,Bengaluru, IN
4 Department of Mechanical Engineering, University Visvesvaraya College of Engineering, Bangalore University, Bengaluru, IN

Abstract

Developing a biodegradable polymer composite by using chitosan as matrix and natural fiber as reinforcement plays a vital role in order to increase mechanical properties. Chitosan has been exploited for its mucoadhesvie property which has tremendous biomedical applications in order to explore the mechanical and thermal capability. This study initialized with manufacturing of chitosan-based composite with three different natural fibers namely banana, coir, and sisal. The results of the incorporation of natural fibers with chitosan on the strength of composite blends were investigated. Further the prepared sample undergone Thermo gravimetric analysis and peel test to evaluate their thermal stability and adhesive property. The results indicate that the chitosan improves the thermal property of composites, whereas the increasing percentage of chitosan in peel test sample gets saturated hence the adhesive property gets deteriorate.

Keywords

Chitosan, TGA, peel test, biodegradable polymer, natural fibers.

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Praveen B B ¹, Sanman S ¹, Anil K C ², Prashanth K P ¹, Lava Kumar K S ¹

Affiliations
1 Department of Mechanical Engineering, Acharya Institute of Technology, Bengaluru, India., IN
2 Department of Industrial Engineering & Management, Siddaganga Institute of Technology, Tumakuru, Karnataka, India 572104., IN

Abstract

The Mechanical properties of composites are fundamental for the design of fiber composite structures. A new finite element analysis (FEA) technique is established to determine the effective properties of composite materials. The technique involves finite element analysis of Representative Volume Element (RVE). The boundary condition plays an important role in the analysis of composite RVE. It is important to predict the correct boundary conditions (BCs) to be applied on RVE before the analysis of composite RVE. In order for the deformation in RVE to accurately reflect the deformation within the composite structure, the BCs must be suitable. The appropriate boundary conditions to be applied are determined in this study using FE analysis of isotropic RVE. The composite RVE is subjected to the thusly acquired boundary conditions, and the resulting material property along that direction is given a unit displacement along the necessary direction. Averaging the stress -strain fields generated from the analysis yields the effective properties of unidirectional fibre reinforced composite material.

Keywords

Representative Volume Element, Finite Element Analysis, Isotropic, Composites; Stress.

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