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model: nonlinear static steps and neo-Hookean hyperelasticity, mapped by the deck writers

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A nonlinear_static procedure (nonlinear geometry, initial/min/max increments,
increment and iteration caps, force/displacement/energy tolerances, line
search), validated with caps against hostile values. Materials gain an
explicit hyperelastic option (decoupled compressible neo-Hookean on the
isotropic constants). Abaqus writes *STEP, NLGEOM, INC / *STATIC with the
increments and *HYPERELASTIC, NEO HOOKE; LS-DYNA writes the ramped implicit
run with full Newton and *CONTROL_IMPLICIT_AUTO; Nastran refuses SOL 400 by
name, as LS-DYNA does hyperelastic materials in nonlinear steps. Explicit
dynamics refuses hyperelastic materials by name; solve.run names the solver
still to come.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01NmAttHhUZTokgPeEJia8sm
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jyvikoandClaude Opus 5.5 authored and Irakli Kourtis committed 2026-10-14 04:00:21 -04:00
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commit bc9fe2191a
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crates/model/src/lib.rs
+3 -2
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@@ -57,12 +57,13 @@ pub use discrete::{Direction, Mass, PointMass, ResolvedDirection, ResolvedMass,
pub use fluids::{BoxFace, BoxFaces, FaceCondition, FluidBoundary, FluidDomain, Profile, SurfaceBoundary, SurfaceCondition};
pub use geometry::{Classification, Entity, GeometryRef};
pub use loads::{Distribution, Load, centrifugal_acceleration};
pub use materials::{Damage, Directional, Elastic, Erosion, Fluid, Hardening, HardeningPoint, Material, Plastic, Thermal};
pub use materials::{Damage, Directional, Elastic, Erosion, Fluid, Hardening, HardeningPoint, Hyperelastic, Material, Plastic, Thermal};
pub use mesh::{Element, ElementEdge, ElementFace, ElementKind, Node, check_coordinates};
pub use sections::{BeamProfile, Extent, Formulation, Integration, Section, SectionKind};
pub use sets::Set;
pub use steps::{
BulkViscosity, ExplicitDynamic, Hourglass, HourglassKind, InitialVelocity, OutputVariable, Procedure, RigidWall, Step, StressRate, Transient,
BulkViscosity, ExplicitDynamic, Hourglass, HourglassKind, InitialVelocity, MAX_NONLINEAR_INCREMENTS, MAX_NONLINEAR_ITERATIONS, NonlinearStatic,
OutputVariable, Procedure, RigidWall, Step, StressRate, Tolerances, Transient,
};
pub use units::UnitSystem;