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solver, model: imperfections from buckling modes in nonlinear steps

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NonlinearStatic.imperfection {step, mode, scale}: the buckling step's mode, scaled to a largest
component of `scale`, is added to the node coordinates before the step is solved, with a warning
naming it; Abaqus and LS-DYNA decks refuse it by name. A clamped–free column with its first mode
as imperfection under half its buckling load amplifies it by 1/(1 − α) within 2.8 %.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01UhhZMBTviDQxZvwnyP89fo
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jyvikoandClaude Opus 5.5 authored and Irakli Kourtis committed 2026-10-14 13:30:59 -04:00
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commit 0bb1c2462f
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crates/model/src/lib.rs
+1 -1
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@@ -67,7 +67,7 @@ pub use mesh::{
pub use sections::{BeamProfile, Extent, Formulation, Integration, Section, SectionKind};
pub use sets::Set;
pub use steps::{
BulkViscosity, ExplicitDynamic, Hourglass, HourglassKind, InitialVelocity, MAX_LOAD_PATH_POINTS, MAX_NONLINEAR_INCREMENTS,
BulkViscosity, ExplicitDynamic, Hourglass, HourglassKind, Imperfection, InitialVelocity, MAX_LOAD_PATH_POINTS, MAX_NONLINEAR_INCREMENTS,
MAX_NONLINEAR_ITERATIONS, NonlinearStatic, OutputVariable, Procedure, RigidWall, Step, StressRate, Tolerances, Transient,
};
pub use units::UnitSystem;