82 KB544 KB88 KB199920252006Batista, MilanJakomin, MarkoKosel, FrancKosel, Tadejštevilka:1232 straniletnik:52str. 785-816ISSN:0039-2480COBISSID:9821211URN:URN:NBN:SI:doc-PA0GAWLWenslAssociation of Mechanical Engineers and Technicians of Slovenia et al.Zveza strojnih inženirjev in tehnikov Slovenije et al.Strojniški vestnikbimetalne lupinematematični modelimehanske lastnostitermične lastnostiPreskok sistema plitve osnosimetrične bimetalne lupine z uporabo nelinearne teorije| Snap-through of the system for a shallow axially symmetric bimetallic shell using non-linear theory|The paper deals with the stresses, strains and buckling conditions in thin, axially symmetric, shallow, bimetallic shells. Based on third-order theory, which takes into account the equilibrium state of the forces and moments that are acting on the deformed system, the paper presents a model with a mathematical description of the geometry of the system, the stresses, the thermoelastic strains and the displacements. The mathematical formulation is based on the theory of large displacements. As an example, the results for spherical, shallow shells are shown, approximated by a parabolic function. Besides simple roller-supported shells, also simple bearing-supported shells and clamped shells are discussed. The shells are loaded with temperature and/or a concentrated load acting at the top. The displacement state and the snap-through temperature are calculated numerically using a non-linear methodV prispevku obravnavamo napetostne, deformacijske in stabilnostne razmere pri tankih, osnosimetričnih plitvih bimetalnih lupinah. Po teoriji drugega reda, ki upošteva ravnotežje sil na deformiranem telesu, podajamo model z matematičnim opisom geometrije sistema, premikov, napetosti in termoelastičnih deformacij. Enačbe temeljijo na teoriji velikih premikov. Kot primer predstavljamo rezultate za krogelne lupine, ki jih aproksimiramo s parabolično funkcijo. Poleg prosto polozenih lupin obravnavamo tudi vrtljivo in konzolno vpete lupine ter lupine, ki so poleg segrevanja obremenjene tudi s silo v temenu. Deformacijsko krivuljo in temperaturo preskoka računamo numerično z nelinearno strelsko metodoTEXTznanstveno časopisjejournalsSlovenian National E-content AggregatorNational and University Library of SloveniaUniverza v Ljubljani, Fakulteta za strojništvo