Mrt 12 Report post Posted June 27, 2019 Hello all! i have one question! is it possible in Optstrct to do these thing? i want to use nonlinear analysis (preload by weight) for linear buckling analysis/ any idea? thank a lot, Guys! Quote Share this post Link to post Share on other sites
Mrt 12 Report post Posted June 28, 2019 No idea? Quote Share this post Link to post Share on other sites
Rahul R 336 Report post Posted June 28, 2019 This is possible with OptiStruct.Please refer attached document from OptiStruct user guide. Linear Buckling Analysis.pdf Quote Share this post Link to post Share on other sites
Simon Križnik 336 Report post Posted June 28, 2019 Hi, it is possible to use nonlinear quasistatic analysis as a preload for linear buckling analysis (see attached model). From Optistruct help: Quote A linear buckling solution cannot be performed on a linear static subcase that uses inertia relief. STATSUB(BUCKLING) can only be used to reference buckling to linear static or nonlinear static (small displacement + N2S/S2S contact only) subcases. For more information in using a preloaded linear static analysis (with STATSUB(PRELOAD) pointing to large displacement nonlinear analysis), in buckling analysis, refer to Linear Buckling Analysis in the User Guide. NLASTAT+BUCKLING.hm Rahul R and Mrt like this Quote Share this post Link to post Share on other sites
Mrt 12 Report post Posted June 28, 2019 Wow! Thank a lot, Guys!:) I'll read and look at your attached files! Quote Share this post Link to post Share on other sites
Mrt 12 Report post Posted June 30, 2019 @Hyperman I've just tried to open file. Sorry, could you resave file on HM 2017, or just send .fem file? Quote Share this post Link to post Share on other sites
Simon Križnik 336 Report post Posted June 30, 2019 Glad to help. NLSTAT+BUCKLING.fem Mrt likes this Quote Share this post Link to post Share on other sites
Mrt 12 Report post Posted June 30, 2019 @Hyperman perfect!=) it works! my mistake was that i had used static nonlin-geom.) where did you find in UsGuide part about it feature? Quote Share this post Link to post Share on other sites
Simon Križnik 336 Report post Posted June 30, 2019 That document is from Reference Guide>Input Data>Subcase Information Section>STATSUB. STATSUB.pdf Mrt likes this Quote Share this post Link to post Share on other sites
Mrt 12 Report post Posted June 30, 2019 ok=) thank a lot. interesting, but i have different result from abaqus. ) the rate is 2. Quote Share this post Link to post Share on other sites
Simon Križnik 336 Report post Posted June 30, 2019 You're welcome. The results should be similar. Which model are you referring to? Compare analysis set-up in both solvers (unfortunately I do not use Abaqus). Quote Share this post Link to post Share on other sites
Mrt 12 Report post Posted June 30, 2019 at first i'll try to check units=) i think the same, results should be similar. linear buckling (without nnl step) results are the same. Quote Share this post Link to post Share on other sites
