46855 2018 eng 45 64 198 article Elsevier 1 -- -- -- The so-called cyclic R curve, i.e. the crack size dependence of the fatigue crack propagation threshold in the physically short crack regime, is a key parameter for bringing together fatigue strength and fracture mechanics concepts. Its adequate determination is of paramount importance. However, notwithstanding this relevance, no test guideline is available by now and only very few institutions have spent research effort on cyclic R curves so far. The aim of the present paper is to give an overview on the state-of-the-art. Besides an introduction into the basic principles, the discussion will concentrate on the experimental determination on the one hand and questions of its application on the other hand. Engineering fracture mechanics 10.1016/j.engfracmech.2017.09.032 0013-7944 1873-7315 04.12.2018 Uwe Zerbst Mauro Madia J. Maierhofer S. Kolitsch H.-P. Gänser R. Pippan eng uncontrolled Cyclic R-curve eng uncontrolled Fatigue crack propagation threshold eng uncontrolled Crack closure mechanisms eng uncontrolled Cyclic R-curve analysis eng uncontrolled Kitagawa-Takahashi diagram Ingenieurwissenschaften und zugeordnete Tätigkeiten Verlagsliteratur Datei im Netzwerk der BAM verfügbar ("Closed Access")