.cntf file

An OptiStruct ASCII format results file.

File Creation

This file is created when the OPTI format is selected in the CONTF I/O Option Entry for Linear Static, Linear Inertia Relief, and Nonlinear Static Analysis.

File Contents

This file contains the following details. The output is controlled by the CONTF I/O Option.
  • Total contact force
  • Total contact area
  • Total normal force
  • Total tangential force
  • Contact utilization factor and shear magnitude. These are available only if the UTIL option is specified in the CONTF I/O Option.
  • Contact moment. This is only available when the MNTREF continuation line is defined in the CONTACT Bulk Data Entry.

File Format

The .cntf file has the following format:

For each iteration, the following header is used.
iter  Iteration  Numel
Data
Description
iter
Keyword identifying that the next field is the iteration number.
Iteration
Iteration number.
Numel
Total number of nonlinear quasi-static subcases (with contact) in the entire model.
Within the Iteration section, the following information is provided for each subcase.
SUBCASE: <Subcase ID>  <Number of Contact Interfaces>  LOAD: <Load ID> LABEL: <Label>
CONTACT INTERFACE: TOTAL FORCE ACTING ON MAIN SURFACE (BASIC SYSTEM) AND TOTAL CONTACT AREA
CONTACT#  FORCE-X  FORCE-Y  MAGNITUDE  AREA
Data
Description
CONTACT#
The Contact Interface identification number (CTID on the CONTACT Bulk Data Entry).
FORCE-X
The component of the total contact force along the X-axis of the Basic System.
FORCE-Y
The component of the total contact force along the Y-axis of the Basic System.
FORCE-Z
The component of the total contact force along the Z-axis of the Basic System.
MAGNITUDE
The magnitude of the total contact force acting on the Main Surface.
AREA
The total contact area.
CONTACT INTERFACE: TOTAL NORMAL AND TANGENTIAL FORCES ACTING ON MAIN SURFACE
CONTACT#  NORMAL FORCE  TANGENT FORCE
Data
Description
NORMAL FORCE
The total contact force along the normal direction of the contact.
TANGENT FORCE
The total contact force along the tangential direction of the contact.
Note: The following contact moment output is available only when the MNTREF continuation line is defined in the CONTACT Bulk Data Entry.
CONTACT INTERFACE: MOMENT ACTING ON CONTACT SURFACE (BASIC SYSTEM)
CONTACT#        MOMENT-X          MOMENT-Y          MOMENT-Z
Data
Description
CONTACT#
The Contact Interface identification number (CTID on the CONTACT Bulk Data Entry).
MOMENT-X
X-component of the moment, about the reference point in MNTREF definition, in the basic coordinate system.
MOMENT-Y
Y-component of the moment, about the reference point in MNTREF definition, in the basic coordinate system.
MOMENT-Z
Z-component of the moment, about the reference point in MNTREF definition, in the basic coordinate system.