{"id":32366,"date":"2018-12-29T21:07:49","date_gmt":"2018-12-29T21:07:49","guid":{"rendered":"\/forum\/forums\/topic\/entering-non-linearity-in-workbench-for-concrete\/"},"modified":"2023-12-01T03:06:59","modified_gmt":"2023-12-01T03:06:59","slug":"entering-non-linearity-in-workbench-for-concrete","status":"closed","type":"topic","link":"https:\/\/innovationspace.ansys.com\/forum\/forums\/topic\/entering-non-linearity-in-workbench-for-concrete\/","title":{"rendered":"Entering non-linearity in Workbench for concrete"},"content":{"rendered":"

I intend to model the non-linear behavior of reinforced concrete in ANSYS workbench. I have seen some discussions<\/a> and videos regarding this and have some confusion and problems which I would like to clarify. From the experimental results I had the load-displacement values which I later converted to flexural stress and flexural strain. According to the discussion (Multilinear Kinematic Plasticity created from a stress-strain graph<\/a>), the engineering stress and engineering strain should be converted to true stress and true strain before entering the values for a material in Engineering Data. I followed the calculation in that discussion but I am getting the both Engineering stress-strain and True stress-strain curves almost similar. I also checked the plastic strain with and without offsetting, plotted with true stress but still had some issue, had almost the same curve.<\/p>\n

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Another discussion (Non-Linear Analysis_Multilinear Theory<\/a>), the user input the values of Raw true stresses and True plastic strains for multi-linear theory (Multi-linear isotropic hardening MISO). Can someone please comment on the calculations are correct or not? Also, as mentioned here<\/a> that should not have the negative slope on the True Stress vs Plastic Strain curve in a multilinear plasticity material model. How can I correct it for my case?<\/p>\n

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I assume that for entering material non-linearity and inputing the values of experimental results we only need to input the true-stress and plastic strain values. From hereafter, I will be referring these two as stress-strain only. If there have some exception, specially related to concrete, then please correct me. Also some researchers have only mentioned the stress-strain values were input, but they didn’t mention whether be engineering or true stress strain or plastic strain with true stress. From what I have searched so far I think it is understood to use the plastic strain with true stress as an input. <\/p>\n

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Some of the articles I read have used MISO for entering the stress-strain curve or values for the material used along with SOLID65. However, some have mentioned the usage of Drucker-Prager or Menetrey-Willam models for the input of stress-strain values for concrete. I would like to ask if I only input the MISO will it be enough to define the non-linear behavior instead of defining the Drucker-Prager or Menetrey-Willam models. In addition, these models require compression and tension results which I do not have and also I am trying to simulate the bending only.<\/p>\n

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In Abaqus, I read some articles only defined concrete damage plasticity and didn’t need to physically design the reinforcements and successfully ran the simulation. In Ansys workbench, as an alternate, I suppose we have the Drucker and Willam model. Could this also be done by defining the MISO only?<\/p>\n

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I intend to model the cracking as well in my static structural model. SOLID65 element is famous for showing the cracking in simulation. However, experts have suggested in some discussion using the SOLID18X elements. Are the SOLID18X able to have the cracking behavior as well? So far what I have searched I think they can not simulate the cracking behavior. If not, then is there any workaround in workbench for modeling the cracking or I shall use SOLID65 only?<\/p>\n

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Also, in some articles, they have skipped the ANSYS models instead have used the Multilinear elasticity (MELAS) to simulate the non-linear concrete. How can I define the Multilinear elasticity (MELAS) in workbench?<\/p>\n","protected":false},"template":"","class_list":["post-32366","topic","type-topic","status-closed","hentry"],"aioseo_notices":[],"acf":[],"custom_fields":[{"0":{"_bbp_old_topic_id":["4538"],"_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","0","0","0","0"],"_btv_view_count":["8718"],"_bbp_subscription":["235427"],"_bbp_status":["publish"],"_bbp_topic_status":["unanswered"],"_bbp_topic_id":["32366"],"_bbp_forum_id":["27791"],"_bbp_engagement":["240","154928","158970","160242","161958","162437","162943","162959","165653","166218","168760","172249"],"_bbp_voice_count":["12"],"_bbp_reply_count":["36"],"_bbp_last_reply_id":["113246"],"_bbp_last_active_id":["113246"],"_bbp_last_active_time":["2020-05-02 01:46:23"]},"test":"jackhero"}],"_links":{"self":[{"href":"https:\/\/innovationspace.ansys.com\/forum\/wp-json\/wp\/v2\/topics\/32366","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\/32366\/revisions"}],"wp:attachment":[{"href":"https:\/\/innovationspace.ansys.com\/forum\/wp-json\/wp\/v2\/media?parent=32366"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}