ISSN:
1013-9826
Source:
Scientific.Net: Materials Science & Technology / Trans Tech Publications Archiv 1984-2008
Topics:
Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
Notes:
This study gives the problem of a crack in the film oriented perpendicular to thefilm-substrate interface with the crack tip terminating at the interface. Based on Beuth’s theory,three-dimensional model is simplified to plane strain problems, which obtains fracture mechanismsof a cracked film-substrate medium by applying the boundary element method(BEM). The methodaptly resolves the problem involving stress concentration and, further, that this study develops themulti-region boundary element method and applies it to evaluate the cracked film-substratemedium. It shows that the stress intensity factor is affected by the different elastic mismatches andthe thickness ratio of the film and the substrate. These results indicate: 1) The stress intensity factorhas remarkable increased with the decrease of the thickness ratio of the film and the substrate. Theeffect of the fracture behavior of film is negligible when the thickness ratio of the film and thesubstrate is above 10, therefore, it is treated as thin film; 2) The stress intensity factor will decreasewith the increase of α ( −1 pα p +1) for β = 0 and β =α / 4 , where α and β are calledDundurs parameters. What’s more, this paper studies the special condition of the film-substratemedium, which is the analysis of the fracture of the absence of any elastic mismatch between thefilm and the substrate, i.e.α=β=0, and revision of the formula of Xia and Hutchinson is put forwardfor the stress intensity factor of the deep crack problems by comparing to the former conclusions ofY.Murakami
Type of Medium:
Electronic Resource
URL:
http://www.tib-hannover.de/fulltexts/2011/0528/01/52/transtech_doi~10.4028%252Fwww.scientific.net%252FKEM.324-325.903.pdf
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