{"id":358943,"date":"2024-03-26T06:07:09","date_gmt":"2024-03-26T06:07:09","guid":{"rendered":"\/forum\/forums\/topic\/inaccurate-stress-values-menetrey-willam-concrete\/"},"modified":"2024-03-26T06:21:08","modified_gmt":"2024-03-26T06:21:08","slug":"inaccurate-stress-values-menetrey-willam-concrete","status":"closed","type":"topic","link":"https:\/\/innovationspace.ansys.com\/forum\/forums\/topic\/inaccurate-stress-values-menetrey-willam-concrete\/","title":{"rendered":"Inaccurate Stress values – Menetrey Willam Concrete"},"content":{"rendered":"

Hi! I am currently modelling an RC Beam subjected to 4 point bending test for my thesis. Here are the following details:<\/p>\n

<\/a><\/p>\n

Symmetry Region – (quarter beam)<\/p>\n

Boundary Conditions<\/p>\n

<\/a><\/a><\/a><\/p>\n

Input parameters for Menetrey Willam concrete<\/p>\n

<\/a><\/p>\n

Input parameters for Steel<\/p>\n

<\/a><\/p>\n

The parameters are all from related literature. <\/p>\n

Command snippet at Concrete body<\/strong><\/p>\n

TB,CONCR,matid,,,MSOL
TBDATA,1,2,1,1e-3,100,10,1e-20<\/p>\n

My reference study shows that the beam should fail at 35 mm. However, my model still does not fail at 70+ mm. My criteria for failure is (1) <\/strong>Steel yielding or von mises stress of steel reaching 400 MPa and (2)<\/strong> Von mises stress of compressive face of concrete reaches 40 MPa. My problem is that even though my model converges, the von mises stress of concrete is only ~30 MPa at 60 mm which causes overestimation of midspan deflection. <\/p>\n

(1) Steel yields at 400 MPa <\/p>\n

<\/p>\n

(2) Concrete Compressive edge (critical location since midspan) still does not reach 40 MPa at 60 mm <\/p>\n

<\/p>\n

 <\/p>\n

1) What can I do to fix this? Is there something wrong with my boundary conditions, input parameters, etc.? <\/p>\n

2) Would you recommend for me to use a different material model? I was wondering if I should just use Multilinear isotropic model for concrete with a solid65 element type but I am not sure if that can successfully model the softening behavior of concrete. I am also thinking if I should use Drucker Prager instead. <\/p>\n

3) Does anyone know what the command snippet above does? When I remove it, the model does not converge. However, I do not know what the values indicate. <\/p>\n

4.) Should I add another model for concrete that takes into account damage? To my understanding, Menetrey Willam is only a plasticity model so it does not sufficiently model post peak behavior (am I right?). Will doing this correct my problem on concrete compressive stress?<\/p>\n

5.)  I will be modelling Fiber sheets afterwards. How can I set an ultimate strain for fiber sheets such that it fractures at that strain value? <\/p>\n

I would really appreciate any help. Thank you very much!<\/p>\n

 <\/p>\n","protected":false},"template":"","class_list":["post-358943","topic","type-topic","status-closed","hentry","topic-tag-menetrey-william","topic-tag-rc-beam","topic-tag-reinforced-concrete","topic-tag-thesis-help-1","topic-tag-three-point-bending-test"],"aioseo_notices":[],"acf":[],"custom_fields":[{"0":{"_bbp_subscription":["44739","88"],"_bbp_author_ip":["23.206.193.154"]," _bbp_last_reply_id":["0"]," _bbp_likes_count":["0"],"_btv_view_count":["670"],"_bbp_topic_status":["unanswered"],"_edit_lock":["1711433750:289735"],"_bbp_topic_id":["358943"],"_bbp_forum_id":["27791"],"_bbp_engagement":["88","44739"],"_bbp_voice_count":["2"],"_bbp_reply_count":["1"],"_bbp_last_reply_id":["359434"],"_bbp_last_active_id":["359434"],"_bbp_last_active_time":["2024-03-28 12:47:48"]},"test":"rjlandichoup-edu-ph"}],"_links":{"self":[{"href":"https:\/\/innovationspace.ansys.com\/forum\/wp-json\/wp\/v2\/topics\/358943","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":1,"href":"https:\/\/innovationspace.ansys.com\/forum\/wp-json\/wp\/v2\/topics\/358943\/revisions"}],"predecessor-version":[{"id":358944,"href":"https:\/\/innovationspace.ansys.com\/forum\/wp-json\/wp\/v2\/topics\/358943\/revisions\/358944"}],"wp:attachment":[{"href":"https:\/\/innovationspace.ansys.com\/forum\/wp-json\/wp\/v2\/media?parent=358943"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}