Abstract
This study aims to select optimum materials for particular spur gear designs. An advanced material selection technique called Ashby’s method was used to determine suitable materials according to their material index. The method requires objective function, constraint and free variables. Objective function was set to minimizing mass based on the bending strength whereas the bending fatigue failure criteria is the constraint. All the input parameters and modification factors during the design process were taken as free variables. The suitable materials were ranked according to their index value then subjected to gear designs. A number of gear designs were performed with different types of materials to show the differences between weights of the parts. Module and face width results were also compared between each other. Lightweight and high strength materials suitable for spur gear designs were found out. And up to 63% weight reduction was achieved compared to conventional gear materials.
Highlights
Gears are defined as toothed members transmitting rotary motion from one shaft to another shaft
This paper investigates lightweight materials for the particular gear designs by using the Ashby’s method
The different type of material selection methods are available in the literature such as decision matrix, pugh method, analytic hierarchy process (AHP), and etc
Summary
Gears are defined as toothed members transmitting rotary motion from one shaft to another shaft. They are commonly used in all type of applications where power transfer is required such as automobiles, industrial equipment, airplanes, helicopters, and marine vessels [1]. A spur gear has teeth on the outside of a cylinder which are parallel to the axis of the cylinder. Many researchers have still carried out studies to determine the gear stresses called as bending stress and surface contact stress by making tooth profile modifications [3,4,5], using computer aided engineering tools [6,7,8]. The material selections were made from a very narrow perspective
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