Crack tip shielding or anti-shielding due to smooth and discontinuous material inhomogeneitiesSimha, N.K. (Avtor) Fischer, Franz Dieter (Avtor) Kolednik, Otmar (Avtor) Predan, Jožef (Avtor) Shan, G.X. (Avtor) fracture mechanicsfracture toughnesscomposite materialslayered materialinhomogeneitycracksfinite element methodelastic bimaterialsThis paper describes a theoretical model and related computational methods forexamining the influence of inhomogeneous material properties on the crack driving force in elastic and elastic-plastic materials. Following the configurational forces approach, the crack tip shielding or anti-shielding dueto smooth (e.g. graded layer) and discontinuous (e.g. bimaterial interface)distributions in material properties are derived. Computational post-processing methods are described to evaluate these inhomogeneity effects.The utility of the theoretical model and computational methods is demonstrated by examining a bimaterial interface perpendicular to a crack in elastic and elastic-plastic compact tension specimens.20052012-06-01 09:50:41Neznano27121UDK: 539.3:519.61/.64COBISS_ID: 10400022ISSN pri članku: 0376-9429NUK URN: URN:SI:UM:DK:IFGIW0NNsl