L. Prabhu ¹, V. Krishnaraj ², S. Sathish ¹, V. Sathyamoorthy ¹

Affiliations
1 Department of Mechanical Engineering, KPR Institute of Engineering and Technology, Coimbatore – 641407, Tamil Nadu, IN
2 Department of Production Engineering, PSG College of Technology, Coimbatore – 641004, Tamil Nadu, IN

Abstract

The scope this research work is to develop and study the finite element analysis of GFRP composite laminates with combined bolted and bonded joint. Polymer matrix composite materials are widely used due to the reason of high strength to weight ratio. Design techniques for fastened joints have received valuable attention due to the different nature of the stress field in the proximity of the joint, the different of failure modes that can occur. A foremost goal of bolted joint research is to limit the effect of several bolting parameters on the bearing strength of the joints. These parameters such as: (a) joint geometry (b) joint configuration (c) loading condition (d) fastening parameters and (e) material parameters. The scope of the project is to examine the influence of certain factors on the strength of bolted joints in [0/90]4s GFRP composites. These features include the tightening torque (T= 15, 20, 25 & 30 Nm). The mechanical properties (Tensile & Compressive) of GFRP laminates have been examined experimentally and theoretically. From the investigational study, it is found that bolted joint and bolted - bonded joint with 6 mm diameter, 25 Nm tightening torque has the extreme strength. Most of the test specimens failed in (a) Bearing failure (b) Net tension failure (c) Shear out failure (d) Cleavage tension failure.

Keywords

Epoxy Resin, Failure Modes, Glass Fibre, Tightening Torque, Washer Size

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V. Sathyamoorthy ¹, S. Deepan ¹, S. P. Sathya Prasanth ¹, L. Prabhu ¹

Affiliations
1 Department of Mechanical Engineering, KPR Institute of Engineering and Technology, Coimbatore – 641 407, Tamil Nadu, IN

Abstract

Objective: The present work is aimed to find an optimum combination of cutting parameters to achieve low surface roughness in end milling of magnesium AM60 with TiN coated carbide tool under dry conditions. Methods: Design of Experiments (DOE) with Response Surface Methodology (RSM) using Box-Behnken design and the regression equations are used to find the optimal combinations of cutting parameters to achieve low surface roughness. The developed RSM model was experienced through Analysis of Variance (ANOVA). An ANOVA analysis was performed to indicate the control of three machining parameters on the surface roughness. Findings: The cutting parameters assessed were spindle speed, depth of cut and feed rate have the greatest effect on the success of the milling operation. Confirmation experiments with the optimum combinations of cutting parameters were carried out in order to explain the efficiency of the response surface design concepts. From ANOVA results, the feed rate was found to be most significant factor affects surface roughness of milled surface. Feed rate, depth of cut and spindle speed affects the surface roughness by 76.18%, 2.94% and 1.99% respectively. It can be fulfilled that RSM method is effective and efficient method to optimize milling parameters for low surface roughness. Applications: Magnesium (Mg) is now emerging as a popular metal for replacing Aluminum (Al) and finding applications in automobile and aerospace industries where fine finishing of the machined component is ultimate requirements to achieve a product quality.

Keywords

End Milling, Magnesium, Response Surface Methodology, Surface Roughness

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S. Sathish ¹, K. Kumaresan ², L. Prabhu ¹, S. Gokulkumar ¹, S. Dinesh ³, N. Karthi ¹

Affiliations
1 Department of Mechanical Engineering, KPR Institute of Engineering and Technology, Coimbatore – 641407, Tamil Nadu, IN
2 Park College of Engineering and Technology, Coimbatore – 641659, Tamil Nadu, IN
3 SRM University, Chennai – 600089, Tamil Nadu, IN

Abstract

Objectives: The purpose of this study was to investigate the mechanical and morphological characteristics of various bio fibers reinforced epoxy hybrid composites. Various bio fibers such as snake grass, hemp, banana, bamboo, sansevieria, ramie, sisal, jute, flax, pineapple and kenaf fibers are used as reinforcements in polymer composites and appear more attractive due to their bio degradability, low density, recyclability, easily availability and less CO₂ emission. Methods: The hybrid composites reinforced with flax, kenaf, pineapple and sisal fibers were fabricated using a compression molding technique with weight ratio of fiber to resign as 40 : 60 and tested for mechanical properties such as tensile, flexural and impact strength. Findings: Among the different hybrid composites, flax/kenaf/epoxy composite produced better tensile, impact and flexural strength. SEM analysis of the fracture surface indicated that flax/kenaf/epoxy was produced without creating porosity which showed homogeneous distribution of fibers and matrix with better bonding which play an important role in improving the mechanical properties of composites.

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