Case Study of Crack Initiation from Bi-material Notches

0354590 - ÚFM 2011 RIV CH eng J - Journal Article
Klusák, Jan - Knésl, Zdeněk
Case Study of Crack Initiation from Bi-material Notches.
Key Engineering Materials. Roč. 452-453, - (2011), s. 449-452. ISSN 1013-9826.
[Fracture and Damage Mechanics /9./. Nagasaki, 20.09.2010-22.09.2010]
R&D Projects: GA ČR GAP108/10/2049; GA ČR GA101/08/0994
Institutional research plan: CEZ:AV0Z20410507
Keywords : Crack initiation * bi-material notch * fracture mechanics
Subject RIV: JL - Materials Fatigue, Friction Mechanics

Conditions of damage initiation in bi-material structures are analysed in the paper. The considerations are derived from the knowledge of the stress state caused by the existence of the sharp notch and the bi-material interface. The step change of material properties and the geometrical discontinuity at the interface leads to a singular peak of stress that is similar to the stress singularity near the crack tip in homogeneous material. That fact urges to use generalized linear elastic fracture mechanics for assessment of conditions of crack initiation. In the paper crack initiation direction and quantification of the external load connected with crack initiation are discussed. Within the stability assessment, possible directions of crack initiation should be considered and tested in both material components and at their interface as well. Knowing the critical applied stresses, one can decide among the damage eventualities.
Permanent Link: http://hdl.handle.net/11104/0193560