Fem prediction of the influence of warm prestressing on fracture toughness of heat-resistant steel |
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Authors: | P V Yasnii Yu I Pyndus V B Glad’o I B Okipnyi I V Shul’gan |
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Affiliation: | 1.Ivan Pulyui Ternopil National Technical University,Ternopil,Ukraine |
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Abstract: | We present a procedure of prediction of the influence of warm prestressing combined with cycling on the brittle strength of
steel 15Kh2MFA. Using a finite-element method, the effect of the combined warm prestressing on the stress-strain state at
a fatigue crack tip is studied in an elastic-plastic statement. Electron microscopic observations of fracture surfaces have
revealed that fracture is initiated at some distance from the fatigue crack front. Based on the pattern of influence of the
plastic prestrain level on the cleavage stress of steel 15Kh2MFA and the experimental CID value, a method is put forward for
finite-element modeling of the stress-strain state at a crack tip during the specimen fracture. Using the results of the finite-element
modeling, the relevant curves have been plotted and an approximating formula has been proposed to represent the influence
of the combined warm prestress level on the fracture toughness of steel 15Kh2MFA. |
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