Calculation of fracture parameters for the cracked bodies strengthened by circular patches

0177689 - UFM-A 20013193 RIV SIGLE CZ eng C - Conference Paper (international conference)
Gröger, Roman
Calculation of fracture parameters for the cracked bodies strengthened by circular patches.
Výpočtová mechanika 2001. Plzeň: Západočeská univerzita, 2001 - (Křen, J.), s. 69-78. ISBN 80-7082-780-7.
[Výpočtová mechanika /17./. Nečtiny (CZ), 29.10.2001-31.10.2001]
R&D Projects: GA ČR GA106/99/1173
Institutional research plan: CEZ:AV0Z2041904
Keywords : crack * patch * strengthen
Subject RIV: JL - Materials Fatigue, Friction Mechanics

The present article yields a quantitative characterization of the influence of geometry and material properties on the values of fracture parameters. Both the cracked sheets with single and double circular patches are used for the analysis. The desired value of elastic T stress is obtained using the conservation M integral resulting from the Eshelby integral concept. For the SIF calculation, the indirect method of J integral is used and the general concept for the SIF separation in case of a mixed mode of loading is discussed here. The reduction effect is specified by the ratios of SIF and T stress. The method of stiffening the region surrounding the crack tip can be used as an alternative method of the lifetime prolongation, but cannot be used in all cases. Sometimes the usual method of the crack tip singularity cancellation is the only one to repair the structure.
Permanent Link: http://hdl.handle.net/11104/0074608