Bending Stress At Central Plane Of Crank Web Of Centre Crankshaft At TDC Position Calculator

Formula Used:

\[ \sigma_w = \frac{6 \times R_{v1} \times (b_1 - \frac{l_c}{2} - \frac{t}{2})}{w \times t^2} \]

Vertical Reaction at Bearing 1 (Rv1):

Centre Crankshaft Bearing1 Gap from CrankPinCentre (b1):

Length of Crank Pin (lc):

Thickness of Crank Web (t):

Width of Crank Web (w):

Bending Stress in Crankweb (σw):

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1. What is Bending Stress in Crankweb?

Bending Stress in Crankweb is the bending stress in the crank web due to the bending moment acting onto the crank web. It represents the internal resistance of the crank web material to bending deformation caused by external forces.

2. How Does the Calculator Work?

The calculator uses the bending stress formula:

\[ \sigma_w = \frac{6 \times R_{v1} \times (b_1 - \frac{l_c}{2} - \frac{t}{2})}{w \times t^2} \]

Where:

\( \sigma_w \) — Bending Stress in Crankweb (Pa)
\( R_{v1} \) — Vertical Reaction at Bearing 1 (N)
\( b_1 \) — Centre Crankshaft Bearing1 Gap from CrankPinCentre (m)
\( l_c \) — Length of Crank Pin (m)
\( t \) — Thickness of Crank Web (m)
\( w \) — Width of Crank Web (m)

Explanation: This formula calculates the bending stress at the central plane of the crank web in a centre crankshaft at TDC position, considering the geometric parameters and loading conditions.

3. Importance of Bending Stress Calculation

Details: Accurate calculation of bending stress in crankweb is crucial for designing reliable crankshafts, ensuring structural integrity, preventing fatigue failure, and optimizing material usage in engine design.

4. Using the Calculator

Tips: Enter all values in appropriate units (N for force, m for length dimensions). Ensure all values are positive and non-zero. The calculator will compute the bending stress in Pascals (Pa).

5. Frequently Asked Questions (FAQ)

Q1: What is the significance of TDC position in this calculation?
A: The Top Dead Center (TDC) position represents the maximum stress condition where bending moments are typically highest in the crankshaft.

Q2: How does crank web geometry affect bending stress?
A: Thicker and wider crank webs generally reduce bending stress, while longer crank pins and larger bearing gaps may increase bending stress.

Q3: What are typical values for bending stress in crankwebs?
A: Bending stress values vary significantly based on engine size and design, but typically range from 10-100 MPa for automotive applications.

Q4: How does material selection affect the design?
A: Different materials have different yield strengths, so the calculated bending stress must be compared against the material's allowable stress with appropriate safety factors.

Q5: Are there other stress components to consider?
A: Yes, in addition to bending stress, torsional stress and combined stress states should be considered for complete crankshaft analysis.