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1、UNCORRECTED PROOF12A decision support system for coating selection based on fuzzy logic3and multi-criteria decision making4Georgios Athanasopoulosa,*,Carles Riba Romevab,15aDepartment of Project Engineering,Technical University of Catalonia,Spain6bCentre de Disseny dEquips Industrials(CDEI),Technica
2、l University of Catalonia,Spain79a r t i c l ei n f o1011Keywords:12Decision support13Coating selection14Qualitative and quantitative properties15Fuzzy sets16Multi-criteria171 8a b s t r a c t19Wear and corrosion are the most important factors that the surface of the engineering parts must con-20fro
3、nt.The need for protection and improvement of the mechanical characteristics of the surface of engi-21neering parts can be to some extent satisfied by coatings.Coatings are considered as an excellent solution22when resistance to corrosion,oxidation or low friction is demanded,but due the complexity
4、of selecting23the appropriate one,engineers often avoid them.The need for simultaneous consideration of qualitative24and quantitative properties,render the use of classic material selection theories inadequate.An expert25system for coating selection is presented in this paper,which can handle both q
5、ualitative and quantita-26tive variables.The mathematical model used combines the multi-criteria decision making theories27(MCDM)together with the fuzzy sets theory.The Max-Min set”method is applied to calculate the order-28ing value of the alternatives while the TOPSIS method is used to rank them.A
6、 numerical example is pro-29vided to illustrate the method.Finally,the process presented can be easily computerized,to create the30relative software.31?2009 Published by Elsevier Ltd.3233341.Introduction35Mechanical parts in engineering applications usually have to36endure more than a single load,to
7、 serve a single purpose or to have37only one characteristic.Frequently a material has to successfully38withstand a combination of mechanical and chemical loads and39serve different purposes.The various characteristics required can40be divided into two categories,the substrate requirements and41the s
8、urface requirements.42Wear and corrosion are the most important factors that the sur-43face of the engineering parts must confront.Davis(2001)Q1states44that economical reports for the US market,refer almost 300 bil-45lion$annual losses due to corrosion of metals,while scientists46support that 40%of
9、the cost could be avoided by proper corrosion47prevention methods.The need for protection and improvement of48the mechanical characteristics of the surface of engineering parts49can be to some extent satisfied by coatings.50A coating is considered to be a thin layer of a material which is51deposited
10、 over the surface of another material in order to prevent52or decrease the rhythm of the chemical and physical interaction53between the substrate and the environment.Resuming in a few54lines the attributes of coatings,it can be said that they can provide55resistance against corrosion,oxidation,wear
11、and also provide ther-56mal insulation.Moreover,they can improve the mechanical prop-57erties of the surface and change the electronic ones.Even more,58improve the appearance and the optical properties of the surface59and protect the substrate from microbes(ASM Handbook,1994).60By using coatings,the
12、 engineer can choose a simple material as61a base to fabricate a mechanical part and then coat it with a differ-62ent and better material to meet the service criteria.The profits of63that are tremendous and actually the invention of high technology64coatings opened new paths in fabrication design.Gr
13、ainer and Blunt65(1998)present a thorough analysis of the properties and the appli-66cations of the commercial coatings and propose further uses.By67using a simpler material for the substrate,the engineer can dimin-68ish the cost of purchase.Moreover,during forming the tool wear69and the use of lubr
14、icants are diminished as well as the energy con-70sumption.Furthermore,high dimensional accuracy can be easier71achieved.Concerning the use of the part,the wear and corrosion72are diminished,thus the service life increased.These are some of73the characteristics of coatings and how they can be exploi
15、ted.74Not every coating can provide protection against everything.75Each type of coating has its own properties,which can change radi-76cally by changing the process details,like the temperature or depo-77sition time.On the other hand,a material will have different78chemical and mechanical propertie
16、s,depending on the coating0957-4174/$-see front matter?2009 Published by Elsevier Ltd.doi:10.1016/j.eswa.2009.01.016*Corresponding author.Address:Av.Diagonal,647 Edificio H,Planta 10,08028Barcelona,Spain.Tel.:+34 652675912.E-mail addresses:georgios.athanasopoulosupc.edu(G.Athanasopoulos),car-les.rib
17、aupc.edu(C.R.Romeva).1Address:c/Llorens Artigues,46,Edificio U,Planta 0,08028 Barcelona,Spain.Tel.:+34 93 401 08 34;fax:+34 93 401 19 89.Expert Systems with Applications xxx(2009)xxxxxxContents lists available at ScienceDirectExpert Systems with Applicationsjournal homepage: 3430No.of Pages 6,Model
18、5G6 February 2009 Disk UsedARTICLE IN PRESSPlease cite this article in press as:Athanasopoulos,G.,&Romeva,C.R.A decision support system for coating selection based on fuzzy logic.Expert Systems with Applications(2009),doi:10.1016/j.eswa.2009.01.016UNCORRECTED PROOF79deposition method.Combining the a
19、vailable deposition techniques80with different materials,one can get finally the desired coating81properties.82The selection of the appropriate coating is a complicated pro-83cess.Service conditions(load type,chemically aggressive environ-84ment,temperature,etc.),compatibility of the materials,objec
20、ts85shape and deposition parameters are some of the variables that86need to be considered.The final problem results to be multi-87dimensional and classic material selection theories cannot cover88it in full length(Wang&Chang,1995).89The selection of the right coating type and its deposition param-90
21、eters is a process that undertakes a lot of time and experience.On91the other hand,the benefits that can be gained by the use of coat-92ings compensate the dedicated time.Nevertheless,the complexity93and the difficulty of selecting the suitable coating,call for the cre-94ation of a customized select
22、ion strategy.95The purpose of this paper is to present an expert system for96material selection adapted for coatings.The mathematical model97used,combinesthemulti-criteriadecisionmakingtheories98(MCDM)together with the fuzzy sets theory.A modified TOPSIS99method is applied(Triantaphyllou,2000),which
23、 includes a new100definition for the ideal solution”,while the fuzzy data are rated101with the Max-Min set”theory(Chen,1985).A numerical example102is provided to illustrate the method.Finally,the process presented103can be easily computerized,to create the relative software.1042.Material selection a
24、nd decision making105Selecting the best material for a part involves more than select-106ing a material that has the properties that provide the necessary107service performance;it is also intimately connected with the pro-108cessing of the material into a finished part.Thus,a poorly chosen109materia
25、l can add to manufacturing cost and unnecessarily increase110the cost of the part.Also,the properties of the part may be changed111by processing,and that may affect the service performance of the112part(Dieter,2000).113Naturally,material selection has been a case of study for many114researchers and
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