What Is the Norton-Bailey Steady-State Creep Power Law Calculator?
F.H. Norton in 1929 formulated the power-law relationship between stress and steady-state creep strain rate.
It represents the dislocation climb-assisted glide regime that dominates high-temperature engineering alloys.
How Does the Norton-Bailey Steady-State Creep Power Law Calculator Work?
Because the exponent n is typically between 4 and 7, creep strain rate is extremely sensitive to stress.
A modest 15% increase in operating stress can quadruple the steady-state creep rate.
Norton-Bailey Steady-State Creep Power Law Calculator Formula & Variables
The core mathematical equation utilized by this calculator is expressed as:
Norton classical power-law for secondary steady-state dislocation creep rate.
How to Use the Norton-Bailey Steady-State Creep Power Law Calculator
- Input operating stress in MPa, Norton exponent n, and coefficient A.
- Review steady-state creep rate per hour, per second, and accumulated strain per 1,000 hours.
Step-by-Step Example Calculation
Stainless Steel Piping Creep
Input Values:
Understanding Your Result
Integrates directly into finite element solvers (ANSYS, ABAQUS) for non-linear high-temperature stress relaxation.
Factors That Affect the Result
- Pre-factor A scales exponentially with temperature according to Arrhenius activation energy: A ∝ exp(-Q/RT).
When Should You Use This Calculator?
- Turbine blade stress relaxation, pressure vessel creep design (ASME Section VIII Div 2), and piping flexibility.
Assumptions & Limitations
- Applies specifically to secondary steady-state creep; primary hardening and tertiary acceleration are not included.
Frequently Asked Questions
Calculation Accuracy & Reference Note
Standard ASME and British Standards high-temperature creep power law.