In the preload (or base) analysis, could be generally nonlinear. = the spin-softening matrix introduced by rotational = the total stiffness matrix contributed from contact elements Loads or by follower force effect (element FOLLW201) = the load stiffening matrix introduced by external pressure Of a linear perturbation buckling analysis) Stiffening matrix is obtained from a nonlinear analysis – not to beĬonfused with the linear stress stiffening matrix obtained from the first phase = the stress stiffening matrix introduced by non-zero stressesįrom the structure superscript N indicates nonlinear (that is, the stress If it is something like dat or inp use the /INPUT.Where: = the part of the tangent stiffness contributed from the If the file extension is cdb then use the archive read function. So you can use /INPUT to read in the CDB file too (if it does not contain CAD data). Most of the time this does not exist as most FEA pre-processors write out just the FEM information.
The CDB format can include IGES of the CAD associated with the mesh. Otherwise you can use the /INPUT command to read in the input file. In the MAPDL GUI it's in Main Menu -> Pre Processing -> Archive Model -> Read. In MAPDL you can use the CDREAD command to read in the CDB file. You can manually write on out in WB Mechanical by selecting the Solution tree object then in the upper right there is an option to write the input file. So, most programs like WB Mechanical will write out a CDB style input file. As you can imagine reading in 1 command is faster than reading 1000 commands to do the same thing. If you had a model with 1000 nodes the input file would need to include either 1000 instances of the N command or 1 instance of the NBLOCK command. Whereas the CDB version there is a NBLOCK command issued once, then all the node numbers and x/y/z locations follow. For example the APDL command N to define a node must be used once per node defined. While there is one set of APDL commands, we group them into the "CDB" and all the others. In this case "format" really means a file of APDL commands. Hi x5833959 First thanks for watching that video lesson - it's me in the video! In Mechanical APDL we can use the /INPUT command to read in externally generated mesh files if they are in MAPDL format.
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