Abstract
45CrMoVA steel bar specimens were pre-twisted at different angles (θpre) ranging from 8.3° to 16.3°. Torsion fatigue properties of the pre-torsion specimens were investigated. The results indicate that the torsion fatigue life of the specimens increases first, and then decreases with increasing θpre. A model was established to predict torsion fatigue life for the pre-torsion shaft components, and the desired θpre of 11.4° corresponding to the longest fatigue life for the pre-torsion 45CrMoVA steel bars was obtained. It is expected that the model may provide a guideline for the pre-torsion process of the steel shaft parts.
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