One of the determining factors regulating the time interval for drawing a vessel's tailshaft depends upon the design to reduce stress concentrations. Which of the following factors, in part, would be considered to meet this design criteria?
• Stress concentrations in rotating shafts and why smooth transitions are important • How keyways and grooves affect shaft strength and fatigue life • Which shaft features are designed to reduce vs. increase stress at changes in cross-section
• Look at each option and ask: does this feature tend to smooth out stress or create sharp corners where cracks can start? • Think about whether a sharp change in shape (like a corner) is good or bad for fatigue resistance in a tailshaft. • Which feature would classification societies and designers normally use to make the stress flow more gradual along the shaft?
• Identify which options involve sharp corners or sudden changes in geometry. • Consider which feature specifically aims to relieve or distribute stress rather than concentrate it. • Ask yourself: would this detail likely be recommended in shaft design rules to extend inspection intervals by lowering fatigue risk?
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