Maximum Compressive Stress In Crankweb Of Centre Crankshaft For Max Torque Given Crankweb Dimensions Calculator

Maximum Compressive Stress in Crank Web Formula:

\[ \sigma_{cm} = \frac{6 \times M_{br}}{t^2 \times w} + \frac{6 \times M_{bt}}{t \times w^2} + \frac{P_r}{2 \times w \times t} \]

Bending Moment in Crankweb Due to Radial Force (Mbr):

N·m

Thickness of Crank Web (t):

Width of Crank Web (w):

Bending Moment in Crankweb Due to Tangential Force (Mbt):

N·m

Radial Force at Crank Pin (Pr):

Maximum Compressive Stress in Crank Web (σcm):

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1. What is Maximum Compressive Stress in Crank Web?

Maximum Compressive Stress in Crank Web is the stress in the crank web resulting from compressive stress caused by radial thrust on the connecting rod, and bending stress caused by tangential and radial components of thrust force. It's a critical parameter in crankshaft design for maximum torque conditions.

2. How Does the Calculator Work?

The calculator uses the formula:

\[ \sigma_{cm} = \frac{6 \times M_{br}}{t^2 \times w} + \frac{6 \times M_{bt}}{t \times w^2} + \frac{P_r}{2 \times w \times t} \]

Where:

\( \sigma_{cm} \) — Maximum compressive stress in crank web (Pa)
\( M_{br} \) — Bending moment in crankweb due to radial force (N·m)
\( t \) — Thickness of crank web (m)
\( w \) — Width of crank web (m)
\( M_{bt} \) — Bending moment in crankweb due to tangential force (N·m)
\( P_r \) — Radial force at crank pin (N)

Explanation: The formula combines the effects of bending moments from both radial and tangential forces, plus the direct compressive effect of the radial force on the crank web.

3. Importance of Maximum Compressive Stress Calculation

Details: Accurate calculation of maximum compressive stress is crucial for crankshaft design and failure analysis. It helps ensure the crankshaft can withstand the maximum torque conditions without failure, particularly in the critical crank web area.

4. Using the Calculator

Tips: Enter all values in the specified units. Bending moments should be in Newton-meters, dimensions in meters, and force in Newtons. All values must be positive and non-zero.

5. Frequently Asked Questions (FAQ)

Q1: Why is maximum compressive stress important in crankshaft design?
A: It helps determine if the crank web can withstand the combined stresses from bending moments and direct compression without failing, ensuring engine reliability.

Q2: What are typical values for crank web dimensions?
A: Dimensions vary by engine size, but typically thickness ranges from 10-40mm and width from 20-60mm for automotive applications.

Q3: How does this relate to maximum torque conditions?
A: Maximum torque produces the highest forces on the crankshaft, making this the critical condition for stress analysis.

Q4: What safety factors are typically used?
A: Safety factors vary by application but typically range from 2-4 for automotive crankshafts, considering fatigue and dynamic loading.

Q5: Can this calculator be used for all crankshaft types?
A: This formula is specifically designed for center crankshafts under maximum torque conditions with given crank web dimensions.