Creep — Norton Relaxation

CreepPASS · 0.2%

Time-dependent creep, relaxation, viscoelasticity, or viscoplasticity verification. Checks: stress relaxation under fixed total strain.

Tolerance:: 5%

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Problem statement

Geometry: Fixed total strain, E=200000 MPa, sigma0=100 MPa, A=1e-12 MPa^-3 s^-1, n=3, t=1000 s.
Material: Constitutive or analytical definition: sigma(t)=[sigma0^(1-n)+(n-1) E A t]^(1/(1-n)).
Boundary conditions: Required solver capability: norton_creep_with_elasticity. Use the loading/path control stated in the setup and preserve the complete response history.
Measured quantity: sigma(1000 s)=44.72135955 MPa.

WebCAE Terminal

Paste these commands into the Terminal panel inside WebCAE. They use the same text DSL as the application; run one command per line:

units mm
material E=200000 nu=0.3
primitive box dx=100 dy=10 dz=10
mesh hex size=10
fix surface number 1 component=x
fix surface number 3 component=y
fix surface number 5 component=z
load surface number 2 pressure=-44.72136
solve
probe stress_xx id="sxx"

Results comparison

Reference value	σ(1000 s)=44.72135955 MPa
Our result	σ(1000 s)=44.81226208 MPa
Deviation	0.2%
Tolerance	5%
Status	PASS · 0.2%
Mesh details	Релаксация при фиксированной полной деформации ε0=5e-4 (E=200000 MPa, σ0=100 MPa, A=1e-12 MPa^-3·с^-1, n=3), неявный радиальный возврат rtsafe, 300 steps до t=1000 с

Updated: 2026-10-28 · version not recorded