Data analysis of striation spacing, lifetime, and crack length in crankshaft ductile cast iron under cyclic bending loading through high-cycle fatigue regime

In this dataset, experimental results of high-cycle bending fatigue testing on crankshaft ductile cast irons were presented both in raw and analyzed data. For this objective, EN-GJS-700-2 standard samples were cut and machined from the crankshaft of a gasoline engine. Then, stress-controlled rotary fatigue experiments were done on cast iron specimens under cyclic four-point bending loads in a fully-reversed condition (zero mean stress). These tests were considered under different cases of the loading rate and the applied stress, for both smooth and notched samples. The loading frequency was set to 12.5, 33.3, 58.3, and 100.0 Hz. The nominal stress was 226.6, 340.0, and 415.5 MPa in unnotched specimens. These values became 310.9, 513.6, and 642.4 MPa, respectively, when a notch was made on the specimens. After testing, field-emission scanning electron microscopy (FESEM) was utilized from the fracture surface of all samples to find the striation spacing and the crack length plus the fatigue lifetime. Obtained results from the sensitivity analysis illustrated that striation spacing was significantly affected by all three inputs of the loading frequency, the maximum stress, and the stress intensity factor. However, the loading frequency and the stress intensity factor had no effects on the fatigue lifetime and the crack length.