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  4. Does the cyclic J -integral Delta J describe the crack-tip opening displacement in the presence of crack closure?
 
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2015
Journal Article
Title

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

Abstract
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.
Author(s)
Metzger, M.
Seifert, T.
Schweizer, C.
Journal
Engineering fracture mechanics  
Open Access
DOI
10.24406/publica-r-239346
10.1016/j.engfracmech.2014.07.017
File(s)
N-332064.pdf (838.8 KB)
Language
English
Fraunhofer-Institut für Werkstoffmechanik IWM  
Keyword(s)
  • J-integral

  • cyclic J

  • fatigue crack growth

  • crack closure

  • finite-element analysis

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