Hinge (with fracture)
Simulated Simulated in one model family. A hinge is diagnosed by an absence, which is weaker evidence than a presence.
Source: Style sheet v22 §1.3 (amended by the erratum of 2026-11-06)
Definition (canon)
Hinge. The failure geometry of a mechanical node — discontinuous rupture. Fracture (= snap). What the node does at a hinge.
As corrected on 2026-11-06: a hinge's relaxation was measured flat, not falling, and the scale-free cascade belongs to a coupled population near gain one, not to a hinge.
In plain words
It holds, and then it breaks. In the simulation, nothing slowed and nothing clustered beforehand.
It is not
- A node that announces itself with a cascade. Withdrawn. See the erratum.
- Proven to give no warning. An absence of precursors looks identical to an instrument below its event-count floor unless the count is checked (see applicability floor).
What would defeat it
- Canon, erratum. A structurally hinge-typed model, with a stiff transfer curve and no slowing, whose precursor distribution is scale-free when measured above the event-count floor.
- Follows from the definition. A node typed mechanical whose relaxation time diverges as it nears rupture.
What the architecture does about it
Since no signal is expected, the answer is structural, not a forecast. See structural mitigation.
Where it is carried
Ledger rows
- L04 Simulated In a local-load-sharing bundle (stiff to rupture) relaxation is flat down to 10⁻⁵ of the failure stress. 86% of fibres are intact at the snap and the largest precursor burst in about 11,000 was 10 fibres.