Informatics Publishing Limited

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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R. Raja ¹, V. Krishnaraj ², Sabitha Jannet ¹

Affiliations
1 Department of Mechanical Engineering, Karunya University, Coimbatore − 641114, Tamil Nadu, IN
2 Department of Production Engineering, PSG College of Technology, Coimbatore − 641004, Tamil Nadu, IN

Abstract

Objectives: Experimental investigation of the influence of machine tool parameterson the drilling multi material Glass Fiber Reinforced Plastic (GFRP) along with Al 2024. Drilling process issues of GFRP such as: fiber pull-out, poor axial straightness, fuzziness and delamination of GFRP demand this investigation towards the fine tuning and refinement of the existing process. Methods/Statistical Analysis: In this work GFRP laminate was prepared by using compression moulding process and Al 2024 purchased from an industrial supplier. GFRP placed over Al 2024 during the drilling process. Makino S33Vertical machining center was used for conducting the experiment. Syscon dynamometer was used to measure the thrust force and metzer profile projector was used to measure the delamination .Response Surface methodology was used to conduct the experiments. ANalysis Of VAriance (ANOVA) was conducted to find the statistical significance of the process parameters on the responses such as thrust force and delamination. Findings: From the analysis of the findings, certain conclusions could be drawn such as feed (mm/rev) as the most statistically significant process parameter compared to the spindle speed (rpm) and drill bit diameter (mm).Lower feed, higher spindle speed and smaller diameter drill bits are favorable conditions for delamination free holes. Application/ Improvements: These multi material systems are replacing mono (single) material as structural members in aerospace and other similar defense application. These findings could be adopted in fabrication and repair works of above such application.

Keywords

Delamination factor, Drill Bit Diameter, RSM and Drill Diameter, Spindle Speed, Feed, Thrust Force

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