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The Horizontal Bending Moment at Crank-web Joint is the internal bending force acting in the horizontal plane at the juncture of crank-web and crankshaft due to tangential force applied on crank-pin. It represents the bending stress experienced by the crankshaft structure under maximum torque conditions.
The calculator uses the formula:
Where:
Explanation: The formula calculates the bending moment generated by the tangential force acting at a distance equal to 0.75 times the crankpin length plus the crank web thickness from the crank-web joint.
Details: Accurate calculation of horizontal bending moment is crucial for crankshaft design and analysis, ensuring structural integrity under maximum torque conditions and preventing mechanical failures in engine components.
Tips: Enter tangential force in Newtons, length of crankpin in meters, and thickness of crank web in meters. All values must be positive numbers.
Q1: Why is the factor 0.75 used in the formula?
A: The 0.75 factor accounts for the effective lever arm distance where the tangential force acts on the crankpin relative to the crank-web joint.
Q2: What are typical values for horizontal bending moment?
A: Typical values vary significantly based on engine size and design, ranging from a few N·m for small engines to thousands of N·m for large industrial engines.
Q3: How does this relate to crankshaft failure analysis?
A: Excessive horizontal bending moment can lead to fatigue failure at the crank-web joint, making this calculation essential for durability assessment.
Q4: Are there limitations to this calculation?
A: This formula provides a simplified calculation and may not account for all complex stress distributions in actual crankshaft designs.
Q5: Should this calculation be used for safety-critical applications?
A: For safety-critical applications, additional finite element analysis and experimental validation should be conducted alongside this calculation.