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 is a critical parameter in crankshaft design and analysis.

2. How Does the Calculator Work?

The calculator uses the formula:

Where:

• \( \sigma_{cd} \) — Direct compressive stress in crankweb (Pa)
• \( P_r \) — Radial force at crank pin (N)
• \( w \) — Width of crank web (m)
• \( t \) — Thickness of crank web (m)

Explanation: The formula calculates the compressive stress by dividing the radial 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 ensuring the structural integrity of crankshafts, preventing failure under maximum torque conditions, and optimizing design for weight and performance.

4. Using the Calculator

Tips: Enter radial 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 radial force in crankshaft design?
A: Radial force represents the component of thrust force that acts perpendicular to the connecting rod, directly contributing to compressive stresses in the crank web.

Q2: How does crank web geometry affect compressive stress?
A: The width and thickness of the crank web directly determine the cross-sectional area that resists the compressive force. Larger dimensions reduce stress levels.

Q3: What are typical values for direct compressive stress in crankwebs?
A: Acceptable stress levels depend on the material properties of the crankshaft, but typically range from 50-200 MPa for steel crankshafts.

Q4: When is this calculation most critical?
A: This calculation is most important during maximum torque conditions when radial forces reach their peak values.

Q5: Are there other stress components to consider in crankshaft design?
A: Yes, crankshafts also experience bending stresses, torsional stresses, and fatigue stresses that must be considered in comprehensive design analysis.