Issue 35

A. Vshivkov et alii, Frattura ed Integrità Strutturale, 35 (2016) 57-63; DOI: 10.3221/IGF-ESIS.35.07 60 E XPERIMENTAL SETUP series of samples made from stainless steel AISE 304 and titanium alloy OT4-0 were tested in the developed device. The tests were carried out for samples of different sizes and with different types of stress concentrators. The geometry of the samples is shown in Fig. 4. During tests the samples were subjected to cyclic loading of 10 Hz with a constant amplitude and stress ratio R = -0.1. The crack length in the course of the experiment was measured by the potential drop method [4]. a) b) c) Figure 4 : Geometry of samples: a, b – steel, c – titanium. Contact heat flux sensors were made for each type of the sample. The sizes of sensor are shown in Fig. 5. a) b) c) Figure 5 : Sizes of sensors: a) – Peltier element 10x10 mm., b) – Peltier element 50x50 mm., c) – Peltier element 30x30 mm. (1 – plastic, 2 – copper plate, 3 – termocouple, 4 – Peltier elements). A