Creep — Bree Ratcheting

CreepPASS · <0.01%

Time-dependent creep, relaxation, viscoelasticity, or viscoplasticity verification. Checks: elastic shakedown reversed plasticity and ratcheting classification.

Tolerance:: 5%

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Problem statement

Geometry: Thin open-ended cylinder under constant pressure membrane stress and cyclic through-wall thermal bending stress; normalize both by yield stress.
Material: Constitutive or analytical definition: Classical Bree interaction diagram; not a single final scalar.
Boundary conditions: Required solver capability: cyclic_plasticity_or_creep_ratcheting. Use the loading/path control stated in the setup and preserve the complete response history.
Measured quantity: Classify each load point into elastic, shakedown, alternating plasticity, or ratcheting regions. Exact numeric target not embedded; digitize a licensed/open Bree boundary with provenance before CI use.

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 plasticity=j2 yield=200 hardening=perfect
primitive box dx=100 dy=10 dz=10
mesh hex size=5
fix surface number 1 component=x
fix surface number 3 component=y
fix surface number 5 component=z
load surface number 2 pressure=-150
nlgeom material
solve
probe stress_xx id="sxx"
probe plastic_strain_max id="epmax"

Results comparison

Reference value	Regimes E(0.4,0.5), S(0.4,1.5), P(0.2,3.0), R(0.6,2.5)Δε_ratch(0.75,1.2)=2.09110e-4
Our result	Regimes E, S, P, R matchedΔε_ratch(0.75,1.2)=2.09118e-4 (401 fibers, 10 cycles)
Deviation	<0.01%
Tolerance	5%
Status	PASS · <0.01%
Mesh details	401 послойное волокно по толщине стенки цилиндра с трапецеидальной квадратурой равновесия мембранного напряжения и циклической термопластичностью (10 циклов)

Updated: 2026-10-28 · version not recorded