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


Volume 7 Issue 4 August - October 2017

Research Paper

An FEA Study on Impact Resistance of Bio-Inspired CAD Models

Tom Page* , Gisli Thorsteinsson**
* Senior Lecturer, Loughborough Design School, United Kingdom.
** Professor, Department of Design and Craft Education, Iceland University of Education, Iceland.
Page, T., and Thorsteinsson, G. (2017). An FEA Study on Impact Resistance of Bio-Inspired CAD Models. i-manager’s Journal on Mechanical Engineering, 7(4), 1-15. https://doi.org/10.26634/jme.7.4.13708

Abstract

The purpose of this paper is to explore the use of biomimetic methods in the design of armour systems. It focusses on biological structures found in nature that feature both rigid and flexible armours, analysing their structures and determining which are the most widely successful. A study was conducted on three bio-inspired structures built in Creo Parametric and tested using Finite Element Analysis (FEA) software to determine which structure had the best impact resistance. The study was conducted based on parameters from a study conducted on impact testing biological materials (Lee et al., 2011). The aim of the study was to discover if a bio-inspired model built using ABS (Acrylonitrile Butadiene Styrene) and silicone, based on the structure of an osteoderm would perform well under impact.

Research Paper

Optimization and Modeling of Cutting Force and Chip-Tool Interface Temperature during Hard Turning of AISI 4340 Steel under Wet Condition

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. (2017). Optimization and Modeling of Cutting Force and Chip-Tool Interface Temperature during Hard Turning of AISI 4340 Steel under Wet Condition. i-manager’s Journal on Mechanical Engineering, 7(4), 16-26. https://doi.org/10.26634/jme.7.4.13709

Abstract

Hard turned materials are widely used in manufacturing industries. However during hard turning high heat is generated at the cutting zone, that causes the earlier tool wear, which tends to decrease the machining performance. The heat generation during hard turning can be controlled by using cutting fluids during the machining. Therefore an attempt has been made in this research work to optimize the process parameters during hard turning of AISI 4340 steel with CBN (Cubic Boron Nitride) inserts under wet condition of machining. The cutting speed, feed rate, workpiece hardness, and tool nose radius were selected as process parameters. The cutting force and chip-tool interface temperature were chosen as performance parameters. The central composite design was selected to perform the experiments. The analysis of variance (ANOVA) was carried out to analyze the significance of the process parameters. The second order mathematical models for cutting force and chip-tool interface temperature were prepared. The optimal values of the process parameters which provide minimum values of cutting force and chip-tool interface temperature are suggested.

Research Paper

Effect of Cutting Conditions on Chip-Tool Interface Temperature Using Numerical Methods

Dr.M. Sivarama* , P. Nanda Kumar**, G. Ranga Janardhana***
* Assistant Professor, Department of Mechanical Engineering, Sri Venkateswara College of Engineering and Technology, Andhra Pradesh, India.
** Professor, Department of Mechanical Engineering, N.B.K.R Institute of Science and Technology, Vidyanagar, Andhra Pradesh, India.
*** Professor, Department of Mechanical Engineering, and Member - Andhra Pradesh Public Service Commission, India.
Sivaramakrishnaiah, M., Kumar, P. N., and Janardhana, G. R. (2017). Effect of Cutting Conditions on Chip-Tool Interface Temperature Using Numerical Methods. i-manager’s Journal on Mechanical Engineering, 7(4), 27-32. https://doi.org/10.26634/jme.7.4.13710

Abstract

In this present research work, finite element models of cutting simulations including residual stresses and temperatures are developed to explore tool flank face on carbide tool stress growth from depositions to machining. For research, tungsten carbide tool performance in machining EN24T alloys with various cutting conditions was employed. A cohesive zone interface in a carbide tool for two dimensional cutting simulations was performed. The measurement of interface zone temperatures on workpiece was performed using infrared thermal camera. The cutting, feed, thrust forces were measured using Kristler dynamometer. The surface roughness was measured by using Taylor Hobson surface roughness tester and temperature was measured by using Infrared camera. Measurement of chip tool interface temperature is very difficult. In this work presented, the temperature and heat flux at the chip tool interface was found using heat conduction problem. The research methods employed include thermo mechanically coupled Finite Element Method (FEM) of cutting simulations, including the residual stress and temperature, tool simulation performance analysis and tool stress growth. Machining of EN24T alloy workpiece was done with a force and temperature sensor, and tool wear progress at different variable conditions in the FE cutting simulations were employed for coating analysis. The major result in cutting stresses and temperature remained dominant, compared with 2D finite element method simulations results and experimental results; both differences are satisfactory.

Research Paper

Natural Fiber Reinforced Polymer Composite Used for Automotives and its Mechanical Properties Analysis

R Suresh* , 0**, B. Sankar Reddy***
* Assistant Professor, Department of Mechanical Engineering, Siddartha Institute of Science and Technology, Puttur, Andhra Pradesh, India.
** Assistant Professor, Department of Mechanical Engineering, Sri Venkateswara College of Engineering & Technology, (Autonomous), Chittoor, Andhra Pradesh, India.
*** Student, Siddartha Institute of Science and Technology, Puttur, Andhra Pradesh, India.
Suresh,R., Sivaramakrishnaiah, M., and Reddy,B. S. (2017). Natural Fiber Reinforced Polymer Composite Used for Automotives and its Mechanical Properties Analysis. i-manager’s Journal on Mechanical Engineering, 7(4), 33-41. https://doi.org/10.26634/jme.7.4.13711

Abstract

Nowadays natural fibers are used in Automobile industries and Aircraft bodies for outside and inside parts manufacturing. The reason is because the natural fibers are available in cheap and processing of the fibers will be simple and renewable. The composites are made by using the natural fiber reinforcements as they are of low cost and density as well as exhibit better mechanical properties. They are also effective due to easy availability of raw materials and simplicity of manufacturing. In this research paper, the manufacturing of natural fiber (like banana, coir, jute, hemp, etc.) reinforced plastic polymer composites is discussed. The pure glass fiber epoxy polymer composite is tested and compared with sandwiched glass fiber and banana fiber epoxy polymer composite. The important variables that can be required for making automobile parts are taken for this purpose, and the Tensile, Flexural, Impact tests, etc., are tested. In that tests, different strengths were collected. Finally it is concluded that compared with other fibers, sandwiched fibers are in good condition in terms of strength, and their application are also brought into consideration.

Research Paper

Effect of Injector Opening Pressure on Performance Characteristics of CI Engine with Safflower Oil

A. Swarna Kumari* , CH. Penchalayya**, A.V. Sita Rama Raju***
* Professor, Department of Mechanical Engineering, Jawaharlal Nehru Technology University, Kakinada, India.
** Professor (Rtd.), Department of Mechanical Engineering, Jawaharlal Nehru Technology University, Kakinada, India.
*** Professor, Department of Mechanical Engineering, Jawaharlal Nehru Technological University Hyderabad, Andhra Pradesh, India.
Kumari, A. S., Penchalayya, Ch., and Raju, A. V. S. R. (2017). Effect of Injector Opening Pressure on Performance Characteristics of CI Engine with Safflower Oil. i-manager’s Journal on Mechanical Engineering, 7(4), 42-49. https://doi.org/10.26634/jme.7.4.13712

Abstract

For the last two decades the search for alternate fuels for diesel engines has been intensified to substitute fossil fuels. This is mainly due to the depletion of fossil fuels and environmental pollution. Among many different types of alternate fuels available, vegetable oils and their blends have come across the world as alternative fuels. In the present paper, experimental investigation for the performance and emissions of a direct injection diesel engine with Safflower oil and Safflower diesel blends at three injector opening pressures 200, 220, and 240 bar are carried and compared with standard data of diesel fuel. It has been observed that safflower oil blend B20 can be used successfully with three pressures in place of diesel fuel with lower exhaust emissions and better performance.