Nauticus Machinery Knowledge Centre Help library Tools and Calculations Crankshaft Fatigue Tool
Module Description
The Nauticus Crankshaft Fatigue tool evaluates the fatigue safety of crankshafts in marine engines by analyzing stresses in pin and journal fillets, oil bores, and semi-built crankshafts. It ensures compliance with DNV Class Guidelines 0037 and IACS UR M53 standards, helping engineers assess fatigue life and optimize crankshaft design for improved durability and reliability.
Key Features
- Fatigue safety evaluation for crankshaft pin fillets, journal fillets, and oil bores under cyclic loads.
- Safety against slippage for semi-built crankshafts.
- Compliance with Classification Rules based on DNV Class Guidelines 0037 and IACS UR M53.
- Multiple load input methods including theoretical cylinder pressure calculations, digitized cylinder pressure curves, and imported vibratory torques from Nauticus Torsional Vibration.
- Surface treatment consideration including induction hardening, nitriding, shot peening, and cold rolling.
- Subsurface strength evaluation for hardened crankshafts, ensuring durability at transition zones.
- User-Defined fatigue strength data allowing manual input of bending and torsional fatigue strength from testing.
- Automated report generation for compliance verification and crankshaft approval.
Workflow
- Define General Data by selecting calculation method (DNV/IACS), engine type (2-stroke/4-stroke), and cylinder configuration (inline/Vee engine).
- Input Load Data using theoretical cylinder pressure curves, digitized data imports, or direct user-defined forces.
- Specify Geometry Data including crankshaft dimensions and crank throw details.
- Assign Material Properties such as yield strength, tensile strength, production method, and surface treatment.
- Optional Input for custom fatigue strength values from experimental testing.
- Perform Calculations to determine stress levels, fatigue safety factors, and failure risks.
- Evaluate Results by verifying compliance with DNV and IACS fatigue safety criteria.
- Generate Reports including detailed stress analysis, safety margins, and crankshaft approval datasheets.