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f1564a0 | 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 | # Known limitations and safe claims
## What v1 represents
- Synthetic, three-dimensional, small-strain material-point histories.
- Prescribed proportional deviatoric strain paths.
- J2 plasticity with linear isotropic hardening.
- Chaboche combined hardening, explicitly marked as an experimental AgentFEM
capability.
- A benchmark for path dependence, sequence learning and reproducible
constitutive-surrogate studies.
## What v1 does not represent
- Structural finite-element field data.
- Experimental calibration of a named alloy.
- Fatigue life, damage initiation or crack propagation.
- Temperature dependence, creep, viscoplasticity or finite strain.
- True non-proportional multiaxial loading with rotating stress/strain
directions.
- Validation against every commercial constitutive implementation.
## Important interpretation limits
- High random-split accuracy does not establish path or parameter
extrapolation.
- The pointwise MLP is a history-blind scientific control, not a competitive
constitutive architecture.
- The GRU result establishes learnability on the frozen v1 distribution; it
does not by itself establish stable long-cycle or FE deployment.
- Material-point inference speed does not equal end-to-end structural speed-up.
- Raw stress work on plastic strain is retained as a diagnostic. For the
Chaboche model it must not be called thermodynamic dissipation without a
consistent split of stored and dissipated backstress energy.
- Neural-network metrics may vary slightly across hardware and library
versions even when the physics data are deterministic.
## Changes that require a new version
- adding tensor loading paths or new constitutive models;
- changing physical parameter ranges or path-generation rules;
- changing stored variables, units or schema semantics;
- revising trajectory grouping or benchmark splits;
- correcting any physical or numerical defect in a released trajectory.
Extensions should retain v1 unchanged, publish migration notes and report
results separately on the original v1 test set and the new OOD test sets.
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