Direct Compressive Stress In Central Plane Of Crankweb Of Side Crankshaft At TDC Position Calculator

Formula Used:

\[ \sigma_{dc} = \frac{P}{w \times t} \]

Direct Compressive Stress (σ_dc):

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1. What is Direct Compressive Stress in Crankweb?

Direct Compressive Stress in crankweb is the compressive stress in the crank web as a result of only the radial component of thrust force onto the connecting rod & crankpin. It occurs at the TDC (Top Dead Center) position in the central plane of the crankweb.

2. How Does the Calculator Work?

The calculator uses the formula:

\[ \sigma_{dc} = \frac{P}{w \times t} \]

Where:

\( \sigma_{dc} \) — Direct Compressive Stress in Crankweb (Pa)
\( P \) — Force on Crankweb (N)
\( w \) — Width of Crank Web (m)
\( t \) — Thickness of Crank Web (m)

Explanation: The formula calculates the compressive stress by dividing the applied force by the cross-sectional area of the crank web (width × thickness).

3. Importance of Direct Compressive Stress Calculation

Details: Accurate calculation of direct compressive stress is crucial for designing and analyzing crankshafts, ensuring structural integrity, and preventing failure under operational loads at the TDC position.

4. Using the Calculator

Tips: Enter force in Newtons, width and thickness in meters. All values must be positive and non-zero for accurate calculation.

5. Frequently Asked Questions (FAQ)

Q1: What is the significance of TDC position in this calculation?
A: At TDC position, the crankweb experiences maximum compressive stress due to the alignment of forces, making this the critical position for stress analysis.

Q2: How does this stress differ from other stresses in the crankshaft?
A: Direct compressive stress specifically refers to the stress caused by the radial component of force acting perpendicular to the crankweb surface, unlike bending or torsional stresses.

Q3: What are typical values for crank web dimensions?
A: Crank web dimensions vary based on engine size and application, but typically range from 20-100mm in width and 10-50mm in thickness for automotive engines.

Q4: How does material selection affect the maximum allowable stress?
A: Different materials have different yield strengths and safety factors. The calculated stress must be below the material's yield strength with an appropriate safety margin.

Q5: Are there other factors that should be considered in crankweb design?
A: Yes, designers should also consider fatigue loading, stress concentrations at fillets, thermal stresses, and combined loading conditions for comprehensive analysis.