Abstract
The energy density criterion is employed to characterize the crack initiation of pre-cracked specimens. Three-point-bending specimens are used with normalized crack length varying from 0.1 to 0.5. The specimens are made of German steel StE690. The results show that the local energy density increases with almost the same rate with crack extension as the specimen geometry changes. This indicates that the strain energy density can be used to characterize the onset of crack initiation for pre-cracked specimens.
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