想请问出现这个问题是怎么回事？DIFFERENTIAL STIFFNESS MATRIX IS COMPLETELY NULL. THE EIGENPROBLEM CANNOT BE SOLVED....
想请问出现这个问题是怎么回事？DIFFERENTIAL STIFFNESS MATRIX IS COMPLETELY NULL. THE EIGENPROBLEM CANNOT BE SOLVED. IN A BUCKLE ANALYSIS THE MOST LIKELY CAUSE IS THAT A NONZERO LOADING PATTERN WAS NOT SPECIFIED VIA BOUNDARY, CLOAD, DLOAD, ETC,. SEE Eigenvalue Buckling Prediction IN THE Abaqus/Standard USERS MANUAL.
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