Constitutive dependence in finite-element modelling of crack closure during fatigue
Författare
Summary, in English
The influence of choice of constitutive relation on the prediction of crack-opening stress for fatigue cracks using the finite-element method is investigated and compared with experimental results. Two different experimentally obtained stress–strain relations for IN718 at 550 °C were used for fitting material parameters to the linear kinematic and the Bodner–Partom viscoplastic constitutive models. In addition, one reference material description and one Bodner–Partom with parameters fitted to both types of experiment was used, i.e., in total six constitutive descriptions. Experimental values for crack-opening stress were found by the potential drop method for the two load cases analyzed. Two different load cases, load control and displacement control, have been examined. It turns out that the correlation between experimental and analytical crack-opening stress vary significantly with material description, opening criteria in the simulation and load case. The investigation shows that care must be taken when choosing material description and opening criteria for crack propagation simulations.
Avdelning/ar
Publiceringsår
2004
Språk
Engelska
Sidor
75-87
Publikation/Tidskrift/Serie
Fatigue & Fracture of Engineering Materials & Structures
Volym
27
Issue
2
Länkar
Dokumenttyp
Artikel i tidskrift
Förlag
Wiley-Blackwell
Ämne
- Materials Engineering
- Applied Mechanics
Nyckelord
- fatigue
- finite-element modelling
- Bodner-Partom
- crack closure
- material model
- IN718
Status
Published
ISBN/ISSN/Övrigt
- ISSN: 1460-2695