1329 KB25 KB199920252015Bingöl, SedatMisiolek, Wojciechštevilka:10letnik:61str. 610-617, SI 109ISSN:0039-2480COBISSID:14258715URN:URN:NBN:SI:doc-QXFORQWYenZveza strojnih inženirjev in tehnikov Slovenije et al.Strojniški vestnikdejanske napetostimagnezijnapovedovanjetlakPrediction of the true stress of ZE20 magnesium alloy at different temperatures and strain rates|Compression tests were performed to obtain flow stress curves of a newly developed magnesium ZE20 alloy for automobile applications. The experiments were performed in a temperature range from 200 °C to 425 °C and the strain rates from 0.01 to 15 s -1 to examine the material responses at various processing conditions. Artificial neural network (ANN) and gene expressing programming (GEP) were used for the estimation of the true stress curves obtained from the experimental tests. Recently, a few studies were performed to estimate the true stress of different magnesium alloys by using ANN modelling method. However, this method has not yet been applied for the ZE20 alloy; therefore, it was the subject in this study. Furthermore, this study is the first attempt of using a GEP model to predict the true stress of a magnesium alloy. Both developed ANN and GEP models successfully predicted the true stress of ZE20 alloyVečina magnezijevih izdelkov v avtomobilski industriji se izdeluje z visokotlačnim litjem (HPDC), med njimi pa so bloki in glave motorjev, ohišja menjalnikov in druge manjše komponente. Konstruktorji iščejo nove načine za gradnjo avtomobilov, ki bi manj obremenjevali okolje. Zmanjšanje mase avtomobilov je pomembna priložnost za zmanjšanje porabe goriva. Delež kovanih magnezijevih zlitin bi se moral še povečati zaradi visokega razmerja med trdnostjo in maso. Trenutni projekti raziskav in razvoja magnezijevih zlitin in njihove uporabe v avtomobilski industriji so osredotočeni predvsem na kovane magnezijeve zlitine. Predstavljena študija preučuje preoblikovalnost magnezijeve zlitine ZE20, ki jo je razvilo podjetje General Motors. Študije so bile opravljene v dveh fazah: najprej so bili narejeni termomehanski preizkusi za pridobivanje krivulj napetosti pri preoblikovanju magnezijeve zlitine ZE20 pri različnih hitrostih deformacij in temperaturah, v drugi fazi pa so bili razviti modeli APP in GEP za napovedovanje dejanskih krivulj napetosti pri zlitini ZE20TEXTznanstveno časopisjejournalsSlovenian National E-content AggregatorNational and University Library of SloveniaUniverza v Ljubljani, Fakulteta za strojništvo