{"id":44750,"date":"2020-06-04T14:11:22","date_gmt":"2020-06-04T14:11:22","guid":{"rendered":"\/forum\/forums\/topic\/convergence-problem-5\/"},"modified":"2020-06-04T14:11:22","modified_gmt":"2020-06-04T14:11:22","slug":"convergence-problem-5","status":"closed","type":"topic","link":"https:\/\/innovationspace.ansys.com\/forum\/forums\/topic\/convergence-problem-5\/","title":{"rendered":"Convergence problem"},"content":{"rendered":"

Hello everyone !<\/span><\/p>\n

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My name is Alessandro and from few month I have starting to learn how to use ANSYS Mechanical to do somes simulations.
I am some problem with a simulation and I would like to kindly ask you somes helps. <\/p>\n

I would like to simulate the following system:<\/p>\n

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\"System\"<\/p>\n

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There is a concrete base where it is fixed through 12 bolt a steel plate. Between the steel plate and the concrete there is a nitrile rubber to isolate the vibration.<\/p>\n

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The plate can be hit with different object or an object can remain on the plate. The weight of the objects can be up to 1-2t.<\/p>\n

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The idea is, first do a structural simulation to see if the support can resist at the load, then do a modal simulation to see the resonance modes of the plate.<\/p>\n

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In the following pictures is visible the exploded model in ANSYS.<\/p>\n

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\"Ansys<\/p>\n

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I have set this contact:<\/p>\n

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  – Plate-Rubber: Frictional Contact
  – Rubber-Concrete: Frictionless Contact
  – Bolt side surface – Rubber: Frictional Contact and disable small sliding
  – Bolt side surface (down part) – Concrete: Bonded Contact
  – Bolt head downside surface – Plate: Frictional Contact<\/p>\n

The initial contact information say that there aren’t open contact.<\/p>\n

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At the down side of the concrete I have applyed a fixed support.
The bolt pretension is 2500N for each bolt.<\/p>\n

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In the analysis setting I have turn on large deflection.<\/p>\n

In the first step of the simulation I apply the pretension and then I lock it, in the second step I apply a force in one node (near the plate center) with components (20’000N,-20000N,20000N).<\/p>\n

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The problem is that the simulation converge for  the first time step (Bolt pre-tension), but the second step, when I apply the force, doesn’t converge.<\/p>\n

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When the external force is applayed at the plate the bolt head will be not in contact with the plate, I think that this situation cause the convergence problem.<\/p>\n

How I can solve this problem?<\/p>\n

Attached you could find the archive of my simulation model.<\/p>\n

Excuse me for my english and thank you very much in advance for your time and help.
Alessandro<\/p>\n

<\/p>\n

 <\/p>\n","protected":false},"template":"","class_list":["post-44750","topic","type-topic","status-closed","hentry"],"aioseo_notices":[],"acf":[],"custom_fields":[{"0":{"_bbp_old_topic_id":["16931"],"_bbp_old_topic_author_name_id":["Anonymous"],"_bbp_old_is_topic_anonymous_id":["false"],"_bbp_old_closed_status_id":["publish"],"_bbp_author_ip":[null],"_bbp_old_sticky_status_id":["normal"],"_bbp_likes_count":["0"],"_btv_view_count":["1289"],"_bbp_subscription":["252231"],"_bbp_topic_status":["unanswered"],"_bbp_status":["publish"],"_bbp_topic_id":["44750"],"_bbp_forum_id":["27791"],"_bbp_engagement":["79","240","178095"],"_bbp_voice_count":["3"],"_bbp_reply_count":["6"],"_bbp_last_reply_id":["118747"],"_bbp_last_active_id":["118747"],"_bbp_last_active_time":["2020-06-24 06:44:48"]},"test":"alessandrovaghi"}],"_links":{"self":[{"href":"https:\/\/innovationspace.ansys.com\/forum\/wp-json\/wp\/v2\/topics\/44750","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\/44750\/revisions"}],"wp:attachment":[{"href":"https:\/\/innovationspace.ansys.com\/forum\/wp-json\/wp\/v2\/media?parent=44750"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}