i-manager's Journal on Mechanical Engineering (JME)


Volume 8 Issue 1 November - January 2018

Research Paper

Statistical Investigations into the Erosion of Material from the Tool in Micro-Electrical Discharge

Govindan Puthumana*
*Post-Doctoral Researcher, Department of Mechanical Engineering, Technical University of Denmark, Lyngby, Denmark.
Govindan, P. (2018). Statistical Investigations into the Erosion of Material from the Tool in Micro-Electrical Discharge. i-manager’s Journal on Mechanical Engineering, 8(1), 1-7. https://doi.org/10.26634/jme.8.1.13820

Abstract

This paper presents a statistical study of the erosion of material from the tool electrode in a micro-electrical discharge machining process. The work involves analysis of variance and analysis of means approaches on the results of the tool electrode wear rate obtained based on design of experiments approach. The input factors used in the experiments are discharge current (Id), discharge frequency (fp), and pulse width (wp). The individual effects as well as interactions among the input factors have been considered for the analysis. The results of this investigation show that discharge current (Id) and discharge frequency (fd) control the erosion of material from the tool electrode. The material erosion from the tool electrode (Me) increases linearly with the discharge frequency. As the current index increases from 20 to 35, the Mdecreases linearly by e e 29%, and then increases by of 36%. The current index of 35 gives the minimum material erosion from the tool. It is observed that none of the two-factor interactions are significant in controlling the erosion of the material from the tool.

Research Paper

Study on the Effect of Workpiece Hardness and Tool-Nose on Cutting Force and Chip-Tool Interface Temperature during Dry Hard Turning of AISI 4340 Steel

Sanjeev Kumar* , Dilbag Singh**, Nirmal Singh Kalsi***
*-*** Associate Professor, Department of Mechanical Engineering, Beant College of Engineering and Technology Gurdaspur, Punjab, India.
Kumar, S., Singh, D., and Kalsi, N. S. (2018). Statistical Investigations into the Erosion of Material from the Tool in Micro-Electrical Discharge. i-manager’s Journal on Mechanical Engineering, 8(1), 8-19. https://doi.org/10.26634/jme.8.1.13821

Abstract

The selection of process parameters during hard turning is critical deciding the performance of hard turning. In this research work, an attempt has been made to analyze the influence of tool nose radius and workpiece hardness on cutting force and chip-tool interface temperature during hard turning of AISI 4340 steel. The experiments were performed as per layout design with the central composite design. The mathematical models of cutting force and chiptool interface temperature were developed using second order regression analysis. The adequacies of the developed models are analyzed by performing confirmation runs. The significance of the models and influence of the process parameters have been carried out based on Analysis of Variance (ANOVA) technique. The optimal values of the process parameters which provide maximum machining performance are predicted. The results show that workpiece hardness is the significant parameter which affects the performance of hard turning

Research Paper

Enhancing the Functioning of the Composite Leaf Spring using Helping Spring

V. Sai Suresh* , A. Swarna Kumari**
* M.Tech Graduate, Department of Mechanical Engineering, University College of Engineering, Jawaharlal Nehru Technological University, Kakinada, Andhra Pradesh, India.
** Professor, Department of Mechanical Engineering, University College of Engineering Kakinada, Jawaharlal Nehru Technological University, Kakinada, Andhra Pradesh, India.
Suresh, V. S., and Kumari, A. S. (2018). Enhancing the Functioning of the Composite Leaf Spring using Helping Spring. i-manager’s Journal on Mechanical Engineering, 8(1), 20-25. https://doi.org/10.26634/jme.8.1.13822

Abstract

In every automobile, i.e., four wheelers and heavy trucks, leaf spring is one of the main components as it provides a good suspension and plays a vital role in automobile application. In general, suspension systems are used to carry transverse loads to minimize vibrations and for better steering capability of the vehicle. In order to improve working of leaf spring, helping spring is used, i.e. progressive leaf spring. Modeling of progressive leaf spring is done in CATIA V5. This 3D model is imported to ANSYS and analysis is carried out. The strength and deflection of the progressive leaf spring under static loading conditions are determined. Also, Fatigue analysis and model analysis are carried out using ANSYS Workbench so that natural frequencies of the progressive leaf spring can be found. Generally, leaf springs of heavy vehicles are remade of material, EN47. Here, an attempt has been made to replace the EN47 steel leaf spring assembly with GFRP (Glass Fiber Reinforced Polymer) so that functioning can be improved.

Research Paper

Comparative Study of Tensile Strength Properties of Fiber Reinforced Composite Laminates with Different Orientations of Fibers

H. Saidulu* , M. Manzoor Husain**
* Research Scholar, Department of Mechanical Engineering, Jawaharlal Nehru Technological University, Ananthapuramu, India.
** Professor, Department of Mechanical Engineering and Director of Admissions, Jawaharlal Nehru Technological University, Hyderabad, India.
Saidulu,H., and Hussain,M.M. (2018). Comparative Study of Tensile Strength Properties of Fiber Reinforced Composite Laminates with Different Orientations of Fibers. i-manager’s Journal on Mechanical Engineering, 8(1), 26-30. https://doi.org/10.26634/jme.8.1.13823

Abstract

In the recent years, the application of laminated composite materials is growing in all domains of engineering owing to its high strength and stiffness. Consequently, the quality of the fiber reinforced composite materials based on the tensile strength is considered for critical applications. To overcome these challenges, this paper proposed a technique to conduct a critical analysis of reinforced composite laminates. In this approach, laminates are produced using the process subsequently; the tensile strength test is performed for analysing the reinforced composite materials at 0o /90o and 45o angle orientation. The experimental results illustrate an increase in the number of layers that improves the strength to a greater extent. Moreover, fiber reinforced composite laminates with 0o /90o orientation of fibers exhibit o higher tensile strength properties when compared to the laminates with 45o orientation of fibers.

Review Paper

A Review on Mechanical and Tribological Characteristics of Hybrid Composites

Pavankumar* , Sukanth Roga**
* M.Tech Student, SJB Institute of Technology, Bengaluru, India.
** Associate Professor, SJB Institute of Technology, Bengaluru, India.
Pavankumar., and Roga,S. (2018). A Review on Mechanical and Tribological Characteristics of Hybrid Composites. i-manager’s Journal on Mechanical Engineering, 8(1), 31-43. https://doi.org/10.26634/jme.8.1.13824

Abstract

Since thirty years, composite materials are developing day-by-day as human beings are in need. Natural fiber reinforced polymer matrix composites are taking additional advantage in this modern technology as they are ecofriendly and readily available in nature. Natural fibers are advantageous as they are biodegradable in nature. Hybrid composites are combination of different reinforcement materials to the matrix combination, sometimes may be filler or fiber or both. Mechanical properties like tensile strength, impact strength, flexural strength, hardness, etc., are essential parameters to be considered for the selection of a good composite material. Other characters like tribological properties are to be taken into account as important factors in the selection of composite materials. This review paper includes the characterization of mechanical and tribological characteristics of different hybrid composites combinations. The main objective of this review is to select a compatible hybrid composite combination as per required application and requirements; like selection of glass fiber for different applications with compatible fillers, that too based on the mechanical and tribological factors. Different kinds of combinations are discussed based on different research citations and concluded based on which one shows good mechanical and tribological properties and such materials can be used for further research works.