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Does the cyclic J -integral Delta J describe the crack-tip opening displacement in the presence of crack closure?

: Metzger, M.; Seifert, T.; Schweizer, C.

Preprint urn:nbn:de:0011-n-3320648 (838 KByte PDF)
MD5 Fingerprint: 417015eb8c9b7978e37a92e13ce52d16
Created on: 01.08.2016

Engineering fracture mechanics 134 (2015), pp.459-473
ISSN: 0013-7944
Journal Article, Electronic Publication
Fraunhofer IWM ()
J-integral; cyclic J; fatigue crack growth; crack closure; finite-element analysis

In this paper, the correlation of the cyclic J-integral, Delta J, and the cyclic crack-tip opening displacement, Delta CTOD, is studied in the presence of crack closure to assess the question if Delta J describes the crack-tip opening displacement in this case. To this end, a method is developed to evaluate Delta J numerically within finite-element calculations. The method is validated for an elastic-plastic material that exhibits Masing behavior. Different strain ranges and strain ratios are considered under fully plastic cyclic conditions including crack closure. It is shown that the cyclic J-integral is the parameter to determine the cyclic crack-tip opening displacement even in cases where crack closure is present.