What does pred,off mean in Ansys, and how to use the interface

In ANSYS, pred and off are the two commands used to define stick-slip conditions.

pred command:

The pred is used to set the allowable relative slip direction of the contact unit. It allows the main program to detect and prevent collisions or unusual forms of constraints.

Enter the following command in the ANSYS command stream:

pred,key,value

The key can be any of the following:

dir: Specifies the direction in which relative slippage is allowed.

slv: Specifies the surface that is allowed to move from the contact surface.

LIM: Sets the sliding limit.

value is the value of the keyword, which varies depending on the application.

off command:

OFF converts the selected part to exclude contact parts for reconstruction, meshing, and so on. Enter the following command in the ANSYS command stream:

off,id

where ID refers to the ID of the part. If the command succeeds, the associated contact is closed and a free surface boundary condition is generated for all affected nodes.

The above are the basic usage and examples of the PRED and OFF commands in ANSYS, which you can also set through the ANSYS user interface, which also provides relevant options.

It is to translate the length of b 2 in the y direction of the working plane.

ANSYS accelerates the flow of running commands.

It's 200 steps, the other two can be defaulted, the nsubst command is not very important to the calculation, of course, the larger the step, the longer the calculation time is certain, I usually are about 100 or 150.

The greater influence on the calculation is the containment value of cnvtol, f, and cnvtol, u, force and displacement, whether the setting is proper is related to whether the calculation is convergent, you take a closer look, and show you the calculation I did before The settings are referenced, I hope it is useful:

soluacel,0,,0,nsubst,150

pred,on

nropt,full

nlgeom,on

lnsrch,on

outres,all,all

cnvtol,f,,,2,cnvtol,u,,,2,1

Develop a modal analysis.

The method used and the options chain, such as what modal extraction method, etc., and how many modalities are extracted.

In general, the macro call case is used with MXPAND.

It is a modal sales book collection method to use.

1. You can use the "numoff" command to change the number (main menu>preprocessor>numbering ctrls>add number offset).

2. It should be noted that ANSYS can only make systematic modifications (global increase and decrease) when changing the node number, and cannot change the number of a node individually.

y1: the code of the line selection.

nl1: the line number, if all, specifies the grid of all selected lines.

angsiz: The number of degrees spanned per cell at the time of the arc.

ndiv；The number of portions. Solve for displacements, stresses, and forces caused by external loads. Static analysis is well suited to solve problems where the effects of inertia and damping on a structure are not significant.

Static analysis in ANSYS programs can perform not only linear but also nonlinear analyses such as plasticity, creep, expansion, large deformation, large strain and contact analysis.

space:" + the last size is more than the first size.

": The middle size is larger than the end size.

free: The size is controlled by other items.

kforc 0: Sets only undefined lines.