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Material SelectionBy UsingTOPSIS MethodProject Guide : Dr. Rakesh KumarBY :Zakhir Hussain FA/6316/06Abhijit Chowka FA/6317/06Sukanya Kumari FA/6323/06Kumari Pallavi FA/6341/06introduction Why there is a need for material selection?

Engineering design is increasingly driven by the objectives of performance, cost and environmental sensitivity which are limited by materials. One aspect of the optimized product design is that of selecting the materials that best meet the need of design, maximizing its performance and minimizing its cost.CLASSIFICATION OF MATERIAL CHOOSING METHODSMultiple Criteria Decision Making (MCDM)

Optimization Methods

Multiple criteria decision making( mcdm )A single decision making is to choose among a countable or uncountable set of alternatives using two or more (multiple) criteria.MCDM CONSISTS OF TWO RELATED PARADIGMS MADM - It stands for Multiple Attribute Decision Making . These problems are assumed to have a predetermined and limited number of decision alternatives . MODM It stands for Multiple Objective Decision Making . The decision alternatives are not given. instead the set of decision alternatives is explicitly defined by constraints using multiple objective programming. The number of potential decision alternatives may be large.TYPES OF MCDM techniques :

6SAW (Simple Additive Weighting)TOPSIS (Technique for Order Preference by Similarity to the Ideal Solution)ELECTRE (Elimination et Choice Translating Reality)BNBF (Bayesian Network Based Framework)AHP (The Analytical Hierarchy Process)SMART (The Simple Multi Attribute Rating Technique )ANP (Analytic network process)6OBJECTIVE :- To select the best available material in the market for Roll-Cage design of an All Terrain Vehicle using TOPSIS method.

CURRENT PROGRESS :- We are in the initial part of our project. We have read various articles and research of different people regarding our topic. Moreover we are in a position to apply the TOPSIS method on different attributes considered by us.TOPSIS METHODThe Technique for Order Preference by Similarity to Ideal Solution (TOPSIS) is a multi-criteria decision analysis method, which was originally developed by Hwang and Yoon in 1981.

TOPSIS is based on the concept that the chosen alternative should have the shortest geometric distance from the ideal solution. Why Topsis ? ?It applies easy decision making using both positive and negative criteria.

Number of criteria can be applied in this decision process.

Its simpler and faster than AHP and SAW. Some research on topsis Application areasNumber of attributesNumber of alternatives Proposed By :--1) Gear Material SelectionFive Attributes Nine Alternatives Milani et al [10]2) High-Speed Transport System Selection Fifteen Attributes Three Alternatives Janic [8]3) Manufacturing Plant Location AnalysisFive Major Attributes ( 16 Sub-Attributes) Five Alternatives Yoong and Hwang [13]4) Robot Selection Four Attributes Twenty Seven Alternatives Parkan and Wu [22]5) Solid Waste Management Twelve AttributesEleven Alternatives Cheng et al. [5]6) Water Management Six Attributes (with 3 demand points) Twelve Alternatives( or scenarios ) Srdjevic et al. [11]The topsis method is carried out as follows:STEP 1 : Create an evaluation matrix xij, consisting of m alternatives and n criteria. STEP 2 : Construct a normalized decision matrix.STEP 3 : Construct the weighted normalized matrix.STEP 4 : Determine the ideal solution and negative ideal solution.STEP 5 : Calculate the separation measures.

The distance between the ideal point and each alternative and the distance between non ideal point and each alternative can be calculated using following equation :

where, vij = weighted standardized criterian value vj+ = ideal value vj- = negative ideal value12STEP 6 : Calculate the relative closeness to the ideal point and this is given by the following equation:-

Select the option with Ci closest to 1. Why ATV AND ITS ROLL CAGE ? ?Apart from racing and sports sector, this vehicle find its use in many areas like in Agriculture, military services , emergency medical services , border patrol, forestry etc. Roll Cage acts a good protection to the driver safety in case of accident and it enforce the chassis giving it a more rigid base reducing the amount of suspension geometry changeIt also imparts aesthetically pleasing look to an ATV. Why Steel for roll Cage dEsIgn? ? Cheap.

Better weld ability.

Formability is good.

No extra fabrication panel cost.

On average it is 2x times more stronger than its rival-aluminum.

Attributes selected for these materialImportant attribute of the material considered in this project are:- 1.) Tensile strength. 2.) Yield Strength. 3.) Density. 4.) Carbon Content. 5.) Chromium Content. 6.) Cost.

MATERIAL SELECTED FOR ROLLCAGE DESIGNBest Steel grade material available for Roll Cage are as follows:- 1.) AISI 1018 2.) AISI 1026 3.) AISI 4130 4.) ASTM A 106 grade B Steel. THANK YOU