Mental model ~5 min · ~67 min remaining

Linear vs. nonlinear

NLGEOM updates stiffness; TB,BISO enables yielding; TIME is a static load factor.

Operational mental map

Nonlinearity: identify the mechanism

Departure from baseline is interpreted only by separating geometry, material, and incremental strategy.

Complete the diagram from memory

Predict the missing relationships before revealing the model

Write the idea, not the exact wording. The comparison is feedback, not a grade.

3 missing links

1Input

Baseline

Balanced linear model compared with a reference.

2StateWhat MAPDL state must be established or inspected?3DecisionWhat engineering or programming decision follows?4EvidenceWhat evidence would prove that the decision is defensible?

Mental model — Linear versus nonlinear

Linear, geometrically nonlinear, and elastoplastic curves — Figure 1. Three branches on the same geometry: linear, elastic NLGEOM, and elastoplastic.

Geometric: NLGEOM,ON updates stiffness with the deformed configuration.
Material: TB,BISO allows yielding beyond Sy.
Numerical: substeps + iterations; convergence ≠ automatic physical validity.
TIME: load factor in static analysis; do not confuse it with M14 transient time.

Quick check

In a ramped static analysis, what does TIME=0.5 represent?

Half a second of physical transient time. 50% of the load factor applied in that substep. Half of the Newton–Raphson iterations.

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