Hello
I am trying to perform the buckling analysis using SOL105.
Initially I requested, Number of roots desired as 55.
When I tried to increase the Number of roots to more than that, I am getting the following message(in bold).
EIGRL 100 0. 155 MAX
Header
AUTOSPC(NOZERO)=YES
PARAM PRTMAXIM YES
PARAM K6ROT 100.
PARAM SNORM 20.
PARAM POST -1
PARAM NOCOMPS -1
DISPLACEMENT(PLOT) =ALL
$SPCFORCES (PLOT) = 1
STRESS(PLOT) =ALL
FORCE(PLOT) = ALL
$
TEMP(BOTH) = 20121
SUBCASE 10
SUBTITLE = Temperature and preload-displacements
SPC = 10001
$
SUBCASE 10001
TITLE= LC1
SPC = 10001
LOAD = 101
$
SUBCASE 20001
TITLE= Buckling LC1
METHOD = 100
SPC = 10001
STATSUB(PRELOAD) = 10
STATSUB(BUCKLING) = 10001
*** USER INFORMATION MESSAGE 5010 (LNCILS)
STURM SEQUENCE DATA FOR EIGENVALUE EXTRACTION.
TRIAL EIGENVALUE = 9.520809D+00, CYCLES = 4.910854D-01 THE STURM COUNT = 76
*** SYSTEM FATAL MESSAGE 3034 (LNNHERR)
INTERNAL FAILURE IN THE LANCZOS PROCEDURE:
M-ORTHOGONAL QR PROCEDURE FAILED TO CONVERGE. PROBABLE CAUSE:
MASS MATRIX IS INDEFINITE (MODES) OR STIFFNESS MATRIX IS INDEFINITE (BUCKLING).
USER ACTION: CONTACT MSC CLIENT SUPPORT.
*** SYSTEM FATAL MESSAGE 7340 (LNNHERR)
WARNING REPORTED BY SUBROUTINE LNNDRVS (IER= 728)
USER INFORMATION: GRAM-SCHMIDT DID NOT CONVERGE.
TABLE OF SHIFTS: (LNNRIGL)
SHIFT # SHIFT VALUE FREQUENCY, CYCLES # EIGENVALUES BELOW # NEW EIGENVALUES FOUND
1. 7.6885505E-01 1.3955403E-01 0 43
2. -1.0000000E-02 -1.5915494E-02 0 0
3. 9.5208086E+00 4.9108543E-01 76 0
*** SYSTEM FATAL MESSAGE 7340 (LNNRIGL)
TRIDIAGONAL QL DID NOT CONVERGE.
*** USER INFORMATION MESSAGE 9052 (SUBDMAP SEBUCKL)
NO EIGEN SOLUTIONS FOUND IN BUCKLING ANALYSIS.
A POSITIVE STURM COUNT NUMBER INDICATES THE BUCKLING MODES ARE BELOW THE APPLIED STATIC
PRELOAD. ADJUST STATIC PRELOAD BELOW THE LOWEST BUCKLING MODE.
*** USER INFORMATION MESSAGE 4110 (OUTPX2)
END-OF-DATA SIMULATION ON FORTRAN UNIT 12
(MAXIMUM SIZE OF FORTRAN RECORDS WRITTEN = 1 WORDS.)
(NUMBER OF FORTRAN RECORDS WRITTEN = 1 RECORDS.)
(TOTAL DATA WRITTEN FOR EOF MARKER = 1 WORDS.)
Could some one suggest, what mistake I am doing..
Thanks in advance
Prasad.
