The formula to calculate the Stress Ratio (Fatigue) is:
\[ \text{Stress Ratio} = \frac{\text{Minimum Compressive Stress}}{\text{Maximum Tensile Stress}} \]
Stress Ratio is the ratio of minimum and maximum stress amplitudes of a stress cycle in fatigue. Minimum Compressive Stress is the minimum compressive stress in a cyclic load during fatigue. Maximum Tensile Stress is the maximum amount of force per unit area acting onto the specimen so that it is prone to getting stretched.
Let's assume the following values:
Using the formula:
\[ \text{Stress Ratio} = \frac{40000000}{50000000} \approx 0.8 \]
The Stress Ratio is approximately 0.8.
| Minimum Compressive Stress (Pa) | Maximum Tensile Stress (Pa) | Stress Ratio |
|---|---|---|
| 30000000 | 50000000 | 0.600000000000000 |
| 35000000 | 50000000 | 0.700000000000000 |
| 40000000 | 50000000 | 0.800000000000000 |
| 45000000 | 50000000 | 0.900000000000000 |
| 50000000 | 50000000 | 1.000000000000000 |