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Lezenje pri večosnem napetostnem stanjuUle, Boris ; Šuštar, Tomaž ; Rodič, TomažLezneje kovin pri povišanih temperaturah je posledica zapletenih procesov na mikroskopskem in submikroskopskem nivoju. Ker so v različnih fazah lezenja dejavni različni mikromehanizmi, je ... konstitutivna enačba, ki zadovoljivo opisuje lezenje, dokaj zapletena. Takšna enačba, znana pod imenom ▫$\theta$▫-projekcija, povezuje deformacijo ▫$\epsilon$▫ s časom t na naslednji načim: ▫$\epsilon=\theta_1 [1-exp(-\theta_2 t)]+\theta+3[exp(\theta_4 t)-1]$▫ pri čemer so ▫$\theta_1, \theta_2, \theta_3 in \theta_4$▫ hitrostni parametri odvisni od remperature in natezne napetosti.Dobimo jih eksperimentalno iz rezultatov lezenja pri konstantni napetosti, le deloma tudi ia rezultatov lezenja pri konstantni obremenitvi. Žal pa s klasično ▫$\theta$▫-projekcijo ne moremo zadovoljivo opisati lezenja pri večosnem napetostnem stanju. Problem, ki je pomemben tako s teoretične kot praktične plati, smo rešili z modificiranjem ▫$\theta$▫-projekcije; parameter ▫$\theta_4$▫ smo preoblikovali tako, da je ta odvisen še od razmerja med hidrostatično in ekvivalentno napetostjo, ▫$\sigma_m / \bar{\sigma}$▫. V primeru enoosnega natezanja se nova enačba transformira nazaj v prvotno obliko▫$\theta$▫-projekcije, medtem, ko v primeru dodanih tlačnih napetosti pravilno popisuje upočasnevanje tercialne faze lezenja, zaradi zaviranja takoimenovanega creep cavitation procesa. Prikazana je praktična uporaba ▫$\theta$▫-projekcije pri analitični obravnavi rezultatov lezenja jekla 1/2Cr1/2Mo1/4v pri natezni napetosti 278 MPa in temperaturi 838 K. V modificirani obliki je ▫$\theta$▫-projekcija primerna tudi za modeliranje lezenja z metodo končnih elementov.Source: Program in povzetki = [Program and abstracts] (Str. 45)Type of material - conference contributionPublish date - 1996Language - slovenianCOBISS.SI-ID - 17309189
Author
Ule, Boris |
Šuštar, Tomaž |
Rodič, Tomaž
Topics
konstitutivni modeli |
lezenje |
preostala življenska doba |
constitutive models |
creep |
remanent life
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Database name | Field | Year |
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Ule, Boris | 04238 |
Rodič, Tomaž | 08302 |
Source: Personal bibliographies
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