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View Code? Open in Web Editor NEWUpdated Voce-Chaboche (UVC) Material Model for Structural Steels
License: MIT License
Updated Voce-Chaboche (UVC) Material Model for Structural Steels
License: MIT License
It would be nice to have the return-mapping in stress spaces with constraints other than plane-stress. This has an easy implementation by creating an abstract method that defines the C and Q matrices, and their eigen-decompositions. Then various constrained stress spaces can be implemented by just defining the matrices and decompositions.
The following initial state does not converge using UVCuniaxial:
Strain increment = -5.77349738E-06
Trial stress = -41610.0540172518
Initial state variables = 1.18028336E-04 -298.243073 -11.1183214
With parameters
PROPS(1:10) = [ 1.90481E7, 41500., 14147., 15.2, 13595., 211.16, 2.5621E6, 235.12, 94218., 3.16 ]
Probable cause is using single precision for the backstress components, i.e., lines
UVC_MatMod/Abaqus/UVCuniaxial.for
Lines 27 to 28 in a4ef2c0
REAL(8)
The Abaqus versions are not compatible when an initial stress is defined in the elements.
When I try to run the OpenSees test file for the 3b_brick using the following material parameters: nDMaterial UVCmultiaxial 1 185970.0 0.3 332.18 120.48 8.14 93.15 261.75 2 21102.0 173.6 2300.6 10.42, the code diverges the first time the reverse mapping procedure is used.
There are no testing files for the material at the moment, please add some input files to validate the material model!
See line 57 in RESSForLabMA.for.
When return mapping does not converge XIT is called. When the strain increment is very large the return mapping should be by-passed and the time step should be reduced.
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