1190 KB34 KB199920252015Bolka, ŠpelaBoltežar, MihaSlavič, Jankoštevilka:4letnik:61str. 217-226, SI 43ISSN:0039-2480COBISSID:13950235URN:URN:NBN:SI:doc-7IZ5SP60enZveza strojnih inženirjev in tehnikov Slovenije et al.Strojniški vestnikeksperimentielasto-plastični materialikonstitutivne relacijemehanski testipreoblikovanjerezanježilavi lomIdentification of out-of-plane material characteristics through sheet-metal blanking|The mechanical characteristics of sheet metals are typically identified in the in-plane direction, although the sheet-metal forming processes (e.g., blanking, deep-drawing) are normally applied in the out-of-plane direction. As the mechanical characteristics are not necessarily constant, their direct experimental evaluation through the forming process would enable material monitoring and process optimization, and, additionally, material characterization in the out-of-plane direction. Full, partial (to a certain depth) and sequential (consecutive partial steps to full penetration) blanking experiments are performed on a laboratory blanking apparatus to correlate the out-of-plane material characteristics with the in-plane ones. The well-established in-plane approach to damage is introduced for the out-of-plane direction to determine the isotropic Lemaitre damage variable. Furthermore, yield and ultimate shear stresses are determined and correlated to their respective in-plane counterparts, offering a new insight in the sheet-metal blanking processKarakterizacija materialnih lastnosti pločevine se tipično izvaja v ravnini valjanja pločevine s pomočjo standardiziranih testov, denimo enoosnega nateznega ali strižnega preizkusa. Pločevino za različne aplikacije, na primer prebijanje ali globoki vlek, se praviloma dobavlja v večjih kolutih. Materialne lastnosti se spreminjajo že v posameznem kolutu, zagotovo pa med posameznimi koluti, kar otežuje tako proizvodnjo kvalitetnih izdelkov, kot tudi eksperimentalno karakterizacijo materiala. Poleg tega se preoblikovanje pločevine pretežno izvaja v prečni smeri glede na ravnino valjanja pločevine, zato bi bilo smotrno spreminjanje materialnih lastnosti spremljati v tej smeri, vrednosti identificiranih parametrov pa primerjati z vrednostmi, dobljenimi na podlagi standardnih enoosnih nateznih testov v ravnini valjanja pločevineTEXTznanstveno časopisjejournalsSlovenian National E-content AggregatorNational and University Library of SloveniaUniverza v Ljubljani, Fakulteta za strojništvo