The authors analyzed life of specimens with rectangular sections and with notches(crack initiators). The specimens were loaded by amplitudes of bending and torsionalmoments, Mg and Ms respectively. The analysis was performed with use of the finite elementmethod and the MSC Patran program using a modulus for fatigue calculations Fatigue. Theanalysis was done in order to select amplitudes of torsional and bending loading anddetermine fatigue life of the specimens made of 18G2A steel.
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