Abstract
The article addresses the results of the study of the examination of fatigue fracture in mixed and I + II and I + III modes in heat treated steel 42CrMo4. Three types of thermal treatments were performed, each caused various mechanical properties of the material. Tests were performed on two sample types: compact tension specimen (CTS) and rectangular cross-sectional samples for mixed mode and I + III. Mixed mode I + II tests were performed for 30 and 60° load angles while the mixed mode test I + III was carried out for 30 and 45°. In addition, the paper shows crack paths for all cases tested. Presented research aims to expand the knowledge of fatigue crack development under mixed mode while taking into consideration different mechanical properties of the same composition-wise material. The aforementioned knowledge is a significant contribution to defining the material fatigue under complex load, independently to sample geometry and number of other limitations.
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