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About the Analysis issues category
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0
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35
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January 20, 2026
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Global moment equilibrium issue with TIE connections between thickened shell meshes v2
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4
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36
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November 4, 2026
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Mortar contact pair
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11
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556
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November 4, 2026
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*ORIENTATION: a *DISTRIBUTION name that reads as a number (D1, E1, E5, 12, ...) is taken as zero coordinates, and the run stops with only "matrix found to be singular"
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4
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65
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November 4, 2026
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A linear step followed by an NLGEOM step: beams and shells with rotational SPCs stop with "*ERROR in meanrotmpc: MPC has wrong number of terms" (exit 201)
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2
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30
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November 4, 2026
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Norton *CREEP in a linear *VISCO step: a large increment stops ccx with "matrix found to be singular" (exit 255) instead of a cutback
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2
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30
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November 4, 2026
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*CONTACT PRINT CF / CFN / CFS segfaults in a *BUCKLE or *STEADY STATE DYNAMICS step (face-to-face pair, elastic material; own or carried request)
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2
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24
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November 4, 2026
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Axisymmetric model with node-to-surface contact: *EL FILE S plus *CONTACT FILE aborts with SIGABRT and no message (double free in frdcyc.c)
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2
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24
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November 4, 2026
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*EL PRINT ELKE in a linear *STATIC or *BUCKLE step: segmentation fault (resultsmech.f reads the velocities, which linstatic.c and arpackbu.c pass as NULL)
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2
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30
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November 4, 2026
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*SECTION PRINT: FREQUENCYF= does not change how often SOF or FLUX are printed in a mechanical or heat-transfer step, and FREQUENCY= is "not recognized"
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2
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33
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November 4, 2026
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Extrapolated nodal values (S, E, ENER, *SECTION PRINT) of C3D8, C3D8I, C3D20R and expanded 2-D/shell elements are 4e-5 low: the 2x2x2 table in extrapolate.f has 4-digit constants
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2
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22
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November 4, 2026
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*MODEL CHANGE toggles elements: ADD switches an active element off, a second REMOVE switches it back on; GENERATE element sets are misread (random segfault)
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2
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20
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November 4, 2026
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Node-to-surface contact: a slave surface with many faces (e.g. a whole body) overflows the slave-face arrays in inicont.c: wrong forces, hangs or crashes
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2
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25
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November 4, 2026
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Thermal contact: pressure-dependent *GAP CONDUCTANCE is evaluated at the wrong contact pressure (node-to-surface LINEAR/TABULAR, face-to-face TABULAR)
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2
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26
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November 4, 2026
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*PLASTIC, HARDENING=KINEMATIC / COMBINED without NLGEOM: the back stress is updated with the wrong sign, so a tension test softens
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2
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24
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November 4, 2026
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Norton *CREEP with isotropic *ELASTIC: A·t^m is floored at 1e-20, so laws in Pa and s creep too fast and the result depends on the unit system
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2
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21
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November 4, 2026
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Linear *STATIC: SPRING1 / SPRING2 forces caused by a nonzero *BOUNDARY are left out of the load vector, so a SPRING2 from a moved node transmits nothing (exit 0)
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2
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28
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November 4, 2026
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*TRANSFORM is ignored for rotations at shell knots and *KINEMATIC reference nodes; *EQUATION terms on DOF 5/6 of a transformed node are misread
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2
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23
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November 4, 2026
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NLGEOM: an *EQUATION tied to a *RIGID BODY member is not satisfied after a large rotation (also why an identity ORIENTATION changes a *KINEMATIC coupling)
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2
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19
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November 4, 2026
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Steps without NLGEOM that ccx iterates (e.g. an unreached *PLASTIC): *RIGID BODY, *KINEMATIC and mean-rotation MPCs use finite rotations
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2
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23
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November 4, 2026
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NLGEOM is lost after a *FREQUENCY or *BUCKLE step: the next *STATIC step runs geometrically linear unless its *STEP card repeats NLGEOM (exit 0)
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2
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27
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November 4, 2026
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*MODAL DAMPING: the ratio table is sized by the deck's last card (out-of-bounds write, SIGABRT), and RAYLEIGH discards later ratio cards and the *DAMPING values
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2
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22
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November 4, 2026
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*DYNAMIC, EXPLICIT: spring elements are left out of the stable time increment, so a stiff spring makes the solution grow without bound (exit 0, no message)
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2
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22
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November 4, 2026
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Implicit *DYNAMIC (and transient *COUPLED TEMPERATURE-DISPLACEMENT) runs CPE4, CPS4, CAX4, CPE8R, CPS8R and CAX8R elements with half their mass
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2
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31
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November 4, 2026
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Global moment equilibrium issue with TIE connections between thickened shell meshes
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1
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28
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November 3, 2026
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*DEFORMATION PLASTICITY in a *FREQUENCY step: ccx stops after the eigenvalues with "negative eigenvalue of the Cauchy-Green tensor", depending on the units
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3
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104
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October 24, 2026
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*ELEMENT with an unlisted TYPE starting with "D" (e.g. DASHPOT2) is read as a 3-node network element: two DASHPOT2 elements run with exit 0 and no damping
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2
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72
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October 23, 2026
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PERTURBATION *BUCKLE after a heated step: the base thermal strain enters the buckling load case; the factor is wrong and depends on the load size (exit 0)
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3
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52
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October 23, 2026
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*HEAT TRANSFER, *(UN)COUPLED TEMPERATURE-DISPLACEMENT, *VISCO: a blank or zero period (default 1.) prints "step size is negative" and runs with NaN time
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2
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65
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October 23, 2026
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Node surface on a *RIGID BODY node of plane elements, even an unused one: ccx adds a z-SPC and stops with "dependent side of a MPC and a SPC"
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2
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38
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October 23, 2026
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