Utjecaj sekundarnog savijanja na rast pukotina u orebrenim panelima

Božić, Željko and Vujica, Danijel and Braut, Sanjin (2010) Utjecaj sekundarnog savijanja na rast pukotina u orebrenim panelima. = Effect of secondary bending on fatigue crack growth in stiffened panels. Engineering review, 30 (1). pp. 13-21. ISSN 1330-9587. Vrsta rada: ["eprint_fieldopt_article_type_article" not defined]. . Točan broj autora: 3.

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Abstract (Croatian)

Eksperimentalni uzorci ploče i orebrenog panela sa središnjom pukotinom podvrgnuti su cikličkom vlačnom opterećenju. U orebrenim panelima opterećenima na vlak javljaju se izvan ravninske deformacije s lokalnim savijanjem, kao posljedica geometrijskoga ekscenctriciteta nastalog propagacijom pukotina. Faktor sekundarnog savijanja sbf definiran je kao odnos membranskog naprezanja i naprezanja uslijed savijanja u okolici vrha pukotine. Uveden je postupak za simulaciju životnog vijeka konstrukcije temeljen na integraciji Parisove jednadžbe, pri čemu se lokalno savijanje uzima u obzir. Vrijednost faktora intenzivnosti naprezanja, KI, na vanjskoj površini ploče, na kojoj se javlja pozitivno naprezanje uslijed savijanja, izračunava se na temelju membranske vrijednosti faktora intenzivnosti naprezanja utvrđenog metodom konačnih elemenata koristeći programski paket ANSYS i sbf-faktora. Simulirani životni vijek za orebreni panel nešto je kraći od eksperimentalno utvrđenoga životnog vijeka, što upućuje na konzervativnost simulacijske metode.

Abstract

Fatigue crack propagation tests with constant amplitude loading were carried out for a plate and a stiffened panel specimen with a central through crack. In damaged stiffened panels under tension out-of-plane displacements occur with local bending as a result, due to the geometric eccentricities introduced by the cracked cross-section. A secondary bending factor sbf is defined as the ratio of local bending and membrane stresses in the vicinity of a crack tip. Crack propagation simulation procedure based on numerical integration of the Paris equation, taking account of local bending, was introduced. The Mode I stress intensity factors (SIF), KI, associated with the plate free surface on which positive bending stresses occurs is determined from membrane SIF values calculated by ANSYS FE program and the sbf ratio. The introduced crack propagation simulations procedure which takes account of secondary bending proved to be conservative and gives slightly shorter crack propagation life, compared to experimental results.

Item Type:	Article (["eprint_fieldopt_article_type_article" not defined])
Uncontrolled Keywords:	zamor orebrenih panela; faktor intenzivnosti naprezanja; sekundarno savijanje
Keywords (Croatian):	Fatigue of stiffened panels; Stress intensity factor; Secondary bending
Subjects:	TECHNICAL SCIENCE > Mechanical Engineering TECHNICAL SCIENCE > Aviation, rocket and space technology
Divisions:	1300 Department of Aeronautical Engineering > 1310 Chair of Aerodynamics
Indexed in Web of Science:	No
Indexed in Current Contents:	No
Date Deposited:	30 Jun 2015 07:57
Last Modified:	26 Aug 2015 10:28
URI:	http://repozitorij.fsb.hr/id/eprint/4387

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