method provides more options for controlling the contact status compared to the method de-
scribed here.)If thermal body forces were present during the static prestress analysis, these thermal body
forces must not be deleted during the full harmonic analysis or else the thermal prestress will
vanish. Hence, any temperature loads used to define the thermal prestress must also be used
in the full harmonic analysis as sinusoidally time-varying temperature loads. You should be
aware of this limitation and exercise some judgement about whether or not to include temper-
ature loads in their static prestress analysis.4.9.1.2. Prestressed Mode-Superposition Harmonic Analysis
To include prestress effects in a mode-superposition analysis, you must first perform a prestressed
modal analysis. Once prestressed modal analysis results are available, proceed as for any other mode-
superposition analysis.
It is highly recommended that you perform a linear perturbation modal analysis prior to doing the
downstream prestressed mode-superposition analysis. In this case, you must set both Elcalc and
MSUPkey to YES on the MXPAND command during the linear perturbation modal analysis phases so
that the downstream stress expansion pass can produce the consistent solution to the linear or nonlinear
base (static or full transient) analysis. The prestressed nonlinear element history (saved variables) is ac-
cessible only in the first and second phases of the linear perturbation. The downstream MSUP or PSD
analysis can only reuse this nonlinear information contained in the Jobname.MODE file which is gen-
erated in the linear perturbation.
Release 15.0 - © SAS IP, Inc. All rights reserved. - Contains proprietary and confidential informationAdditional Harmonic Analysis Details