Thickness Of Crank Web Of Centre Crankshaft At TDC Position Given Bending Moment In Crank Pin Calculator

Formula Used:

\[ t = 0.7 \times \left( \frac{32 \times M_p}{\pi \times \sigma_p} \right)^{1/3} \]

Thickness of Crank Web (t):

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1. What is the Crank Web Thickness Formula?

The crank web thickness formula calculates the required thickness of the crank web in a center crankshaft at top dead center (TDC) position based on the bending moment and bending stress in the crankpin. This ensures structural integrity under operational loads.

2. How Does the Calculator Work?

The calculator uses the formula:

\[ t = 0.7 \times \left( \frac{32 \times M_p}{\pi \times \sigma_p} \right)^{1/3} \]

Where:

\( t \) — Thickness of crank web (m)
\( M_p \) — Bending moment at central plane of crankpin (N·m)
\( \sigma_p \) — Bending stress in crankpin (Pa)
\( \pi \) — Mathematical constant pi (≈3.1416)

Explanation: The formula derives from bending stress equations and ensures the crank web can withstand the bending moment without excessive stress.

3. Importance of Crank Web Thickness Calculation

Details: Proper crank web thickness is crucial for crankshaft durability, preventing fatigue failure, and maintaining engine performance under varying load conditions.

4. Using the Calculator

Tips: Enter bending moment in N·m and bending stress in Pa. Both values must be positive. The result provides the minimum required thickness in meters.

5. Frequently Asked Questions (FAQ)

Q1: Why is the constant 0.7 used in the formula?
A: The constant 0.7 is an empirical factor that accounts for stress distribution and safety margins in crank web design.

Q2: What are typical values for bending stress in crankpins?
A: Bending stress values vary by material and application but typically range from 50-150 MPa for steel crankshafts in automotive engines.

Q3: How does TDC position affect the calculation?
A: At TDC position, the crankpin experiences maximum bending moments, making this the critical design condition for thickness calculation.

Q4: Can this formula be used for other crankshaft types?
A: This specific formula is designed for center crankshafts. Other crankshaft types may require different calculations.

Q5: What material properties affect the bending stress value?
A: Yield strength, ultimate tensile strength, and fatigue limits of the crankshaft material determine the allowable bending stress.