MAT-41

Norton creep

Steady-state power-law creep.

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GoverningNorton creep

Governing equation

\dot\varepsilon=A\sigma^n

where

A: A (1/s)
sig: sig (MPa)
n: n (—)
ed: Norton creep (1/s)

Lecture brief

Historical brief

Hooke (1678), Hall–Petch grain size, Arrhenius activation and Paris fatigue-crack growth are the spine of materials selection. The sheets relate stress, microstructure and life. This sheet (MAT-41 — Norton creep) is the form associated with Norton creep. Working symbols: $A$ , $sig$ , $n$ $\rightarrow$ $ed$ . Steady-state power-law creep. Pedagogical SI sheet with a live model and a swept parameter.

Purpose

Purpose: compute

ed

from

A

sig

n

in Materials via

\dot\varepsilon=A\sigma^n

Steady-state power-law creep. Use it when a real materials question must be answered in SI before a code check.

Live realistic example

In symbols

Live case. Given

A = 1.000e-16\,\mathrm{1/s}

sig = 80.000\,\mathrm{MPa}

n = 5.000\,\mathrm{—}

, the governing relation

\dot\varepsilon=A\sigma^n

yields

ed = 3.277e-7\,\mathrm{1/s}

. One governing identity, SI units, a single sweep on the sheet. Move a slider: the numbers are this situation, not a canned story.

Calculator

Inputs

A A1e-16 1/ssig sig80 MPan n5 —

Outputs

Norton creep ed0.000 1/s

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Narration of this film

One governing identity, SI units, a single sweep on the sheet.

Steady-state power-law creep. Pedagogical SI sheet with a live model and a swept parameter.

Reading speed

Watch on YouTube