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sisvu:academicYear 2006 (xsd:int)
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sisvu:description Historical overview of catastrophic structure fracture. Cyclic stress and fracture (Wöhler-SN curve). Smith i Haigh diagram. Stress spectrum, spectrum parameters. Linear damage accumulation hypothesis. Duration and working stress of structure. Geometry influence on strenght (stress concentration), calculation method. Cyclic stress-strain graph. Fatigue lines determintion: Collins and Juvinall-Shigley method. Examples in machine part design. Fracture mechanics introduction, stress intensity factor (SIF), COD, J-integral. Mid-term exam. Crack prapagation rate, Paris law and its corrections, life prediction of structure. Other influences: plastification, dimesions, environment. Structure life prediction based on crack propagation rate: crack influence on load capacity of structure. Methods for crack arrest. (en)
sisvu:description Povijesni pregled katastrofalnih lomova konstrukcija. Ciklička naprezanja i lom (Wöhlerovi dijagrami). Smithov i Haighov dijagram. Spektar naprezanja, parametri spektra, normirani spektri. Hipoteza linearnih akumulacija zamora. Palmgren-Minerov i njemu srodni postupci. Vijek trajanja i pogonska čvrstoća konstrukcija. Trajna čvrstoća strojnih dijelova. Utjecaj oblika na čvrstoću (koncentracija naprezanja), postupak računanja. Ciklički dijagrami naprezanja-deformacija. Određivanje linije zamora. Primjeri oblikovanja strojnih dijelova. Uvod u mehaniku loma, intenzivnost naprezanja, COD, J-integral. Prvi kolokvij. Brzina širenja pukotine, Paris-ov zakon. Korekcije Parisova zakona, vijek trajanja. Ostali utjecaji: plastifikacija, dimenzije uzorka, okolina. Vijek trajanja na temelju širenja pukotine: utjecaj pukotine na čvrstoću. Načini sprečavanja širenja pukotine. Reparacija pukotina. Drugi kolokvij. (hr)
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