<\/p>\n
Hey Guys, I’ve been following some tutorials and playing with the non-linear analysis settings and I can’t seem to beat this convergance issue.<\/p>\n
It’s a 6″x2″ beam on top of a 3″x3″ post. All 14ga material @ 50ksi yeild.<\/p>\n
I’ve been meshing it as an all quad mesh with a 10mm primary element size and a 2.5mm element size for the corner radii. It’s meshed off of a surface with a 2mm thickness (.08″ or 14ga).<\/p>\n
I’ve applied a 60,000n force to the top edges.<\/p>\n
This is what the force convergance chart looks like<\/p>\n
<\/p>\n
I was getting results like this but it was failing so I added in the SEMIIMPLICIT commandline in the APDL.<\/p>\n
This is the error I get:<\/p>\n
>>> SOLUTION CONVERGED AFTER EQUILIBRIUM ITERATION 15<\/p>\n
*** WARNING *** CP = 3420.078 TIME= 13:12:27
For load step 1 substep 94, stabilization moment norm = 31.5757016 is
large compared to the internal moment norm 47.3393818. Please check
the result carefully.
*** LOAD STEP 1 SUBSTEP 94 COMPLETED. CUM ITER = 143
*** TIME = 0.922000 TIME INC = 0.400000E-02
*** MAX PLASTIC STRAIN STEP = 0.1816 CRITERION = 0.1500
*** AUTO STEP TIME: NEXT TIME INC = 0.40000E-02 UNCHANGED<\/p>\n
FORCE CONVERGENCE VALUE = 0.2759E+06 CRITERION= 266.2
MOMENT CONVERGENCE VALUE = 1297. CRITERION= 0.2306
DISP CONVERGENCE VALUE = 0.1616E-01 CRITERION= 0.1629E-02
EQUIL ITER 1 COMPLETED. NEW TRIANG MATRIX. MAX DOF INC= -4.487 <\/p>\n
*** ERROR *** CP = 3430.438 TIME= 13:12:38<\/strong> *** WARNING *** CP = 3430.453 TIME= 13:12:38 This is element 104714<\/p>\n Now this all makes sense but I the question is, is there a way to allow the analysis to go further? I would like to see more buckling and then see the spring-back in a second step where the force is removed. So far the analysis fails before reaching step 2. I tried reducing the loading until it converges (about 55,000n) and I got the analysis to successfully move to step 2 but there is no buckling (Step 2 did fail but I think it’s because I had it set to auto time stepping).<\/p>\n I have the time stepping set to 100 initial steps with 250 max. I did this because I didn’t want the analysis going forever. It looks like it’s failing because of excessive deformation anyway, not because I don’t have enough time steps but I’m very open to opinions.<\/p>\n Thanks in advance<\/p>\n<\/div>\n","protected":false},"template":"","class_list":["post-352949","topic","type-topic","status-closed","hentry"],"aioseo_notices":[],"acf":[],"custom_fields":[{"0":{"_bbp_subscription":["304160","88"],"_bbp_author_ip":["23.52.43.81"]," _bbp_last_reply_id":["0"]," _bbp_likes_count":["0"],"_btv_view_count":["1271"],"_bbp_topic_status":["unanswered"],"_edit_lock":["1708548907:247247"],"_bbp_topic_id":["352949"],"_bbp_forum_id":["27789"],"_bbp_engagement":["88","304160"],"_bbp_voice_count":["2"],"_bbp_reply_count":["5"],"_bbp_last_reply_id":["353556"],"_bbp_last_active_id":["353556"],"_bbp_last_active_time":["2024-02-23 18:59:28"]},"test":"wallybangergmail-com"}],"_links":{"self":[{"href":"https:\/\/innovationspace.ansys.com\/forum\/wp-json\/wp\/v2\/topics\/352949","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/innovationspace.ansys.com\/forum\/wp-json\/wp\/v2\/topics"}],"about":[{"href":"https:\/\/innovationspace.ansys.com\/forum\/wp-json\/wp\/v2\/types\/topic"}],"version-history":[{"count":0,"href":"https:\/\/innovationspace.ansys.com\/forum\/wp-json\/wp\/v2\/topics\/352949\/revisions"}],"wp:attachment":[{"href":"https:\/\/innovationspace.ansys.com\/forum\/wp-json\/wp\/v2\/media?parent=352949"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}
Element 104714 has excessive distortion. <\/strong><\/p>\n
Contact status (Real ID: 4) changes abruptly from in-contact to
far-field.
>>> TRANSITIONING TO SEMI-IMPLICIT METHOD<\/p>\n<\/p>\n