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model: load paths of nonlinear static steps

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NonlinearStatic::load_path gives the load factor against the step fraction,
piecewise linear from [0, 0] to fraction 1, so a step can unload or reverse
its loads and prescribed displacements (cyclic loading of path-dependent
materials). Validated (2 to 1000 finite points, increasing fractions), with
load_factor and next_turn for the solver's increments.

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 06:03:36 -04:00
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commit 569b69c061
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crates/model/src/lib.rs
+2 -2
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@@ -62,8 +62,8 @@ pub use mesh::{Element, ElementEdge, ElementFace, ElementKind, Node, check_coord
pub use sections::{BeamProfile, Extent, Formulation, Integration, Section, SectionKind};
pub use sets::Set;
pub use steps::{
BulkViscosity, ExplicitDynamic, Hourglass, HourglassKind, InitialVelocity, MAX_NONLINEAR_INCREMENTS, MAX_NONLINEAR_ITERATIONS, NonlinearStatic,
OutputVariable, Procedure, RigidWall, Step, StressRate, Tolerances, Transient,
BulkViscosity, ExplicitDynamic, Hourglass, HourglassKind, InitialVelocity, MAX_LOAD_PATH_POINTS, MAX_NONLINEAR_INCREMENTS,
MAX_NONLINEAR_ITERATIONS, NonlinearStatic, OutputVariable, Procedure, RigidWall, Step, StressRate, Tolerances, Transient,
};
pub use units::UnitSystem;