By Hirakata, Hiroyuki; Kitamura, Takayuki; Shimada, Takahiro; Sumigawa, Takashi

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This can be applied in a creep/creep (or creep/elastic) bimaterial when the creep-dominated area expands far enough from the interface edge (LSC), and the result of elastic/plastic bimaterial can be used. , 2007, 2008), with the point made that the stress intensity factor decreases in proportion of t1/(n+1) , similar to Eq. 25. 1 Fracture Toughness Consider a material with a crack subjected to a monotonically increasing load. The (linear-elastic) stress intensity factor K (or the J-integral, J, if it is elastic-plastic), which characterizes the intensity of the singular stress field near the crack tip, increases with an increase of the applied load.

1, and that (K1 , K2 ) does not represent the intensity of the opening mode and the in-plane shear mode. Although we can have an arbitrary length for l that expresses oscillate singularity in a nondimensional form, the crack length is usually used for l for convenience. The effect of oscillation in the stress distribution, in general, is confined to a very tiny zone in the immediate neighborhood of the crack tip. In a real crack, because the plastic strain (or process zone) dominates there, the oscillation may not appear.

25. 1 Fracture Toughness Consider a material with a crack subjected to a monotonically increasing load. The (linear-elastic) stress intensity factor K (or the J-integral, J, if it is elastic-plastic), which characterizes the intensity of the singular stress field near the crack tip, increases with an increase of the applied load. This is the driving force for crack propagation, and the crack begins to propagate when the 31 October 21, 2015 11:49 PSP Book - 9in x 6in 02-Takayuki-Kitamura-c02 32 Fundamentals in Fracture Mechanics magnitude of K ( J or G) reaches the material’s inherent resistance to crack propagation, namely the fracture toughness, KC ( J C or GC ).

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