Quick Answer
Calculate Medical Devices Fatigue Life Predictor (Basquin-Modified for Implantable Alloys)
Calculator
Result Interpretation
Medical Devices Fatigue Life Predictor (Basquin-Modified for Implantable Alloys) Calculator computes Cycles to Failure in dimensionless using the defined engineering formula and the input values provided.
Worked Example
Verified calculation
Given:
- Fatigue Strength Exponent = -0.085
- Alternating Stress Amplitude = 145000000
- Mean Stress = 48000000
- Ultimate Tensile Strength = 850000000
- Fatigue Strength Coefficient = 1180000000
Expected Result:
- Cycles to Failure = 25997685047.469
Engineering Interpretation:
Under the given input conditions, the calculated result is: Cycles to Failure = 25997685047.469 dimensionless.
The actual numerical result is computed by the Runtime engine using the persisted tool definition. The values shown here come from automatically validated test cases.
Formula / Method
cycles to failure = pow((alternating stress amplitude / (fatigue strength coefficient * (1 - (mean stress / ultimate tensile strength)))), (1 / fatigue strength exponent))Formula family: formula_medicaldevices_mechanical_fatigue_life_predictor_for_implantable_devices
Variables
| Symbol | Label | Role | Description |
|---|---|---|---|
| sigma_a | Alternating Stress Amplitude | INPUT | Alternating Stress Amplitude |
| sigma_m | Mean Stress | INPUT | Mean Stress |
| sigma_f_prime | Fatigue Strength Coefficient | INPUT | Fatigue Strength Coefficient |
| b | Fatigue Strength Exponent | INPUT | Fatigue Strength Exponent |
| sigma_u | Ultimate Tensile Strength | INPUT | Ultimate Tensile Strength |
| cycles_to_failure | Cycles to Failure | OUTPUT | Cycles to Failure |
Calculation Steps
- Enter the alternating stress amplitude in Pa.
- Enter the mean stress in Pa.
- Enter the fatigue strength coefficient in Pa.
- Enter the fatigue strength exponent in dimensionless.
- Enter the ultimate tensile strength in Pa.
- Step 1: Compute cycles to failure.
- Read the cycles to failure (dimensionless) from the results.
Engineering Summary
Calculate Medical Devices Fatigue Life Predictor (Basquin-Modified for Implantable Alloys)
Frequently Asked Questions
What does this calculator calculate?
The Medical Devices Fatigue Life Predictor (Basquin-Modified for Implantable Alloys) Calculator estimates Cycles to Failure based on the input parameters you provide
Why is alternating stress amplitude important in this calculation?
alternating stress amplitude is directly proportional to cycles to failure. When you enter alternating stress amplitude in Pa, the calculator uses it in the engineering formula to compute the output
How should I interpret the result cycles to failure?
The calculator outputs cycles to failure in dimensionless. The result is computed directly from the input values using the defined engineering formula
What units should I use for the inputs?
Enter each value in the units shown next to the input field: Alternating Stress Amplitude (Pa), Mean Stress (Pa), Fatigue Strength Coefficient (Pa), Fatigue Strength Exponent (dimensionless), Ultimate Tensile Strength (Pa). Make sure all inputs use the specified units for consistent results
What assumptions does this calculator use?
This calculator uses automatically validated engineering formulas. Results are approximate and should be validated against site-specific conditions, applicable codes, and professional engineering judgment
Related Tools
Browse More Tools
Explore the full index of engineering calculators on this vertical site.