NLGEOM,ON! Nonlinear geometric effects (large deformations)
! NROPT=AUTO by default: Program chooses appropriate Newton-Raphson and
! Adaptive Descent options, depending on
! nonlinearities encountered
! Loads:
F,...
D,...
! Load Step Options:
TIME,...! TIME at end of load step
DELTIM,...! Time step controls (starting, min, max)
AUTOTS,ON! Automatic time stepping, including bisection
! KBC=0 by default (ramped loading)
! Dynamic Options:
ALPHAD,...! Mass damping
TIMINT,ON! TIMINT,ON by default, unless you turned it OFF for
! initial-condition load step
! Nonlinear Options:
CNVTOL,...! Convergence criteria
! NEQIT=25 by default
NCNV,,,...! Nonconvergence termination controls
PRED,ON! Predictor ON
OUTRES,ALL,ALL! Results for every substep written to database
LSWRITE! First "real" transient load step
---! Additional load steps, as needed
---
LSSOLVE,1,3! Initiate multiple l.s. solution
SAVE
FINISH
!
! Review the Results:
/POST26! Time-History Postprocessor
SOLU,2,CNVG! Check convergence
SOLU,3,FOCV
PRVAR,2,3
NSOL,...! Store results (displacements, stresses, etc.) as
! variables
PLVAR,...! Graph results vs. TIME to evaluate general quality
! of analysis, determine critical time step, etc.
FINISH
!
/POST1! General Postprocessor
SET,...! Read results from desired time step
PLDISP,...! Postprocess as desired
PLNSOL,...
NSORT,...
PRNSOL,...
FINISHSee the ANTYPE,TRNOPT,LSWRITE,NLGEOM,NROPT,TIME,DELTIM,AUTOTS,KBC,ALPHAD,
TIMINT,CNVTOL,NEQIT,NCNV,PRED,OUTRES,LSSOLVE, and SOLU command descriptions for more
information.
8.9. Restarts
Restart procedures for a transient analysis are essentially the same as for a static analysis; see Restarting
an Analysis in the Basic Analysis Guide.
8.10. Using Nonlinear (Changing-Status) Elements
Nonlinear elements display an abrupt change in stiffness when they experience a change in status. For
example, when a cable goes slack, its stiffness suddenly drops to zero. When two separat e bodies come
into contact, their overall stiffness changes drastically. These and other status-dependent stiffness
changes can be modeled by using nonlinear elements (described below), by applying birth and death
options to applicable elements (see the Advanced Analysis Guide), or by changing material properties
(MPCHG). Some of the nonlinear element features described below are available only in the ANSYS
Release 15.0 - © SAS IP, Inc. All rights reserved. - Contains proprietary and confidential informationUsing Nonlinear (Changing-Status) Elements