Creep — Perzyna Overstress

CreepPASS · 0%

Time-dependent creep, relaxation, viscoelasticity, or viscoplasticity verification. Checks: overstress threshold and rate exponent.

Tolerance:: 5%

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Problem statement

Geometry: Constant uniaxial stress 300 MPa, sigma_y=250 MPa, eta=500 MPa, m=2, duration 10 s.
Material: Constitutive or analytical definition: dot(eps_p)=< (sigma-sigma_y)/eta >^m.
Boundary conditions: Required solver capability: perzyna_viscoplasticity. Use the loading/path control stated in the setup and preserve the complete response history.
Measured quantity: dot(eps_p)=0.01 1/s and eps_p(10 s)=0.1; below sigma_y the rate is exactly zero.

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=250 hardening=perfect
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=-300
nlgeom material
solve
probe stress_xx id="sxx"
probe plastic_strain_max id="epmax"

Results comparison

Reference value	dε_p/dt=0.01 1/sε_p(10 s)=0.1dε_p/dt(σ<σ_y)=0
Our result	dε_p/dt=0.0100000 1/sε_p(10 s)=0.100000dε_p/dt(240 MPa)=0
Deviation	0%
Tolerance	5%
Status	PASS · 0%
Mesh details	Неявный 3D интегратор вязкопластичности Перзины (σ=300 MPa, σ_y=250 MPa, η=500 MPa·с^0.5, m=2, t=10 с) с проверкой согласованной 6×6 касательной D_alg против центральных разностей

Updated: 2026-10-28 · version not recorded