| AID | Analysis Name |
|---|---|
| 050 | Crippling, Isotropic, method Niu, formed and extruded sections |
| 051 | Crippling, Isotropic, method LTV, formed and extruded sections |
| 052 | Crippling, Composite, method MIL-HDBK-17-3E including Dij |
| 053 | Crippling – Buckling Interaction, Johnson-Euler |
| 054 | Crippling, Forced Crippling, Postbuckling, Diagonal Tension |
| 055 | Crippling, Forced Crippling-Compression Crippling Interaction |
| 056 | Crippling, Local, Isotropic, Niu, Formed and Extruded Sections |
| 057 | Crippling, Local, Isotropic, LTV, Formed and Extruded Sections |
| 058 | Crippling, Local, Composite, MIL-HDBK-17 |
Crippling is the observed collapse of short, thin-walled columns after the web and flanges have locally buckled. As load is increased in a postbuckled column, load in the buckled spans remains nearly constant and stresses increase in the corners of the remaining stable cross-section until the column collapses.
The crippling allowable for the entire stiffener is found by computing the crippling stress for each segment of the cross-section and then summing the total crippling load over all of the segments. The allowable crippling stresses for each segment are determined from empirically-derived, log-log curves and are in terms of non-dimensional failure stress and b/t of each segment. Failure stresses are described in terms of yield stress for metallics and ultimate stress (first ply failure) for composites.
Important: The crippling analysis requires that strength margins be activated for each object in the stiffener cross-section.
See the HME document for more information.
See the HVV document for more information.