A combined critical plane and critical distance approach for predicting fatigue crack initiation in notched single-crystal superalloy components
2011 (English)In: International Journal of Fatigue, ISSN 0142-1123, E-ISSN 1879-3452, Vol. 33, no 10, 1351-1359 p.Article in journal (Refereed) Published
The fatigue crack initiation in notched single-crystal components of material MD2 is investigated and analysed. A critical plane approach in combination with a critical distance method has been adopted, in which the total shear strain ranges on the discrete crystallographic slip planes are evaluated. To determine the critical distance two approaches were evaluated, a mean value approach and a cycle dependent approach. Furthermore, a Coffin-Manson type of expression (derived from the results of a set of 12 smooth specimens) is used to predict the number of cycles to fatigue crack initiation. The numerical procedure is applied to a series of experiments, in which notched single-crystal components were exposed to uniaxial cyclic loading in the nominal  crystal direction at 500 degrees C with R(epsilon) = 0. A good correlation between the experimental results and the simulated results was found.
Place, publisher, year, edition, pages
Elsevier, 2011. Vol. 33, no 10, 1351-1359 p.
Single-crystal superalloy; Fatigue crack initiation; Critical plane approach; Notch correction; Critical distance theory
National CategoryEngineering and Technology
IdentifiersURN: urn:nbn:se:liu:diva-69763DOI: 10.1016/j.ijfatigue.2011.05.009ISI: 000292795100002OAI: oai:DiVA.org:liu-69763DiVA: diva2:433634