{"id":381232,"date":"2024-08-30T21:11:56","date_gmt":"2024-08-30T21:11:56","guid":{"rendered":"https:\/\/innovationspace.ansys.com\/forum\/forums\/topic\/mortar-contact-behavior-unaffected-by-igap\/"},"modified":"2024-08-30T21:11:56","modified_gmt":"2024-08-30T21:11:56","slug":"mortar-contact-behavior-unaffected-by-igap","status":"publish","type":"topic","link":"https:\/\/innovationspace.ansys.com\/forum\/forums\/topic\/mortar-contact-behavior-unaffected-by-igap\/","title":{"rendered":"Mortar contact behavior unaffected by IGAP"},"content":{"rendered":"<p>&lt;p&gt;Hi All,&lt;\/p&gt;&lt;p&gt;I&#8217;m currently setting up\/calibrating a model to represent nonlinear cyclic behavior of masonry in LS Dyna implicit. I am representing joints with *CONTACT_AUTOMATIC_SURFACE_TO_SURFACE_TIEBREAK_MORTAR_ID option.EQ.7. When I was tested the normal force-displacement behavior of the contact\/masonry assembly using a displacement controlled BPM, I observed some non-physical comressive behavior with significant penetrations of the contact interface. After reviewing the manual, I started tinkering with IGAP to reduce\/eliminate the penetrations. However, I am getting identical results regardless of the value I supply to IGAP. For my first run I specified IGAP.EQ.default. This was followed by values of 2 and 10. In all three cases the force and displacement are identical. I have attached a screenshot of my model, the comparative force displacement plot, and the contact definition. The SPC&#8217;s only restrain the z-direction, so there shouldn&#8217;t be any restraint against expansion. The BPM is z-direction only. The only connectivity between the two solid elements is the contact. The values for cards A&amp;B are the defaults as I left those blank on the input file.<img decoding=\"async\" src=\"https:\/\/innovationspace.ansys.com\/forum\/wp-content\/uploads\/sites\/2\/2024\/08\/30-08-2024-1725052035-cyclic_normalDir_masonry.jpg\" alt=\"\" \/>&lt;\/p&gt;&lt;p&gt;<img decoding=\"async\" src=\"https:\/\/innovationspace.ansys.com\/forum\/wp-content\/uploads\/sites\/2\/2024\/08\/30-08-2024-1725052050-contact_def.jpg\" alt=\"\" \/>&lt;\/p&gt;&lt;p&gt;<img decoding=\"async\" src=\"https:\/\/innovationspace.ansys.com\/forum\/wp-content\/uploads\/sites\/2\/2024\/08\/30-08-2024-1725052110-normal-stress-displacement.png\" alt=\"\" \/>&lt;\/p&gt;&lt;p&gt;Does anyone have any suggestions of might be causing this?&lt;\/p&gt;<\/p>\n","protected":false},"template":"","class_list":["post-381232","topic","type-topic","status-publish","hentry","topic-tag-contact","topic-tag-implicit-dynamics-1","topic-tag-masonry-1","topic-tag-tiebreak-1"],"aioseo_notices":[],"aioseo_head":"\n\t\t<!-- All in One SEO 4.9.10 - aioseo.com -->\n\t<meta name=\"description\" content=\"Hi All,I&#039;m currently setting up\/calibrating a model to represent nonlinear cyclic behavior of masonry in LS Dyna implicit. 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When I was tested the normal force-displacement behavior of the contact\/masonry assembly using a displacement controlled BPM, I observed some non-physical comressive behavior with significant penetrations of the contact interface.\" \/>\n\t\t<meta name=\"twitter:image\" content=\"https:\/\/innovationspace.ansys.com\/forum\/wp-content\/uploads\/sites\/2\/2024\/08\/30-08-2024-1725052035-cyclic_normalDir_masonry.jpg\" \/>\n\t\t<script type=\"application\/ld+json\" class=\"aioseo-schema\">\n\t\t\t{\"@context\":\"https:\\\/\\\/schema.org\",\"@graph\":[{\"@type\":\"BreadcrumbList\",\"@id\":\"https:\\\/\\\/innovationspace.ansys.com\\\/forum\\\/forums\\\/topic\\\/mortar-contact-behavior-unaffected-by-igap\\\/#breadcrumblist\",\"itemListElement\":[{\"@type\":\"ListItem\",\"@id\":\"https:\\\/\\\/innovationspace.ansys.com\\\/forum#listItem\",\"position\":1,\"name\":\"Home\",\"item\":\"https:\\\/\\\/innovationspace.ansys.com\\\/forum\",\"nextItem\":{\"@type\":\"ListItem\",\"@id\":\"https:\\\/\\\/innovationspace.ansys.com\\\/forum\\\/topics\\\/#listItem\",\"name\":\"Topics\"}},{\"@type\":\"ListItem\",\"@id\":\"https:\\\/\\\/innovationspace.ansys.com\\\/forum\\\/topics\\\/#listItem\",\"position\":2,\"name\":\"Topics\",\"item\":\"https:\\\/\\\/innovationspace.ansys.com\\\/forum\\\/topics\\\/\",\"nextItem\":{\"@type\":\"ListItem\",\"@id\":\"https:\\\/\\\/innovationspace.ansys.com\\\/forum\\\/forums\\\/topic-tag\\\/contact\\\/#listItem\",\"name\":\"contact\"},\"previousItem\":{\"@type\":\"ListItem\",\"@id\":\"https:\\\/\\\/innovationspace.ansys.com\\\/forum#listItem\",\"name\":\"Home\"}},{\"@type\":\"ListItem\",\"@id\":\"https:\\\/\\\/innovationspace.ansys.com\\\/forum\\\/forums\\\/topic-tag\\\/contact\\\/#listItem\",\"position\":3,\"name\":\"contact\",\"item\":\"https:\\\/\\\/innovationspace.ansys.com\\\/forum\\\/forums\\\/topic-tag\\\/contact\\\/\",\"nextItem\":{\"@type\":\"ListItem\",\"@id\":\"https:\\\/\\\/innovationspace.ansys.com\\\/forum\\\/forums\\\/topic\\\/mortar-contact-behavior-unaffected-by-igap\\\/#listItem\",\"name\":\"Mortar contact behavior unaffected by IGAP\"},\"previousItem\":{\"@type\":\"ListItem\",\"@id\":\"https:\\\/\\\/innovationspace.ansys.com\\\/forum\\\/topics\\\/#listItem\",\"name\":\"Topics\"}},{\"@type\":\"ListItem\",\"@id\":\"https:\\\/\\\/innovationspace.ansys.com\\\/forum\\\/forums\\\/topic\\\/mortar-contact-behavior-unaffected-by-igap\\\/#listItem\",\"position\":4,\"name\":\"Mortar contact behavior unaffected by IGAP\",\"previousItem\":{\"@type\":\"ListItem\",\"@id\":\"https:\\\/\\\/innovationspace.ansys.com\\\/forum\\\/forums\\\/topic-tag\\\/contact\\\/#listItem\",\"name\":\"contact\"}}]},{\"@type\":\"Organization\",\"@id\":\"https:\\\/\\\/innovationspace.ansys.com\\\/forum\\\/#organization\",\"name\":\"Ansys Learning Forum\",\"description\":\"Ansys Innovation Space\",\"url\":\"https:\\\/\\\/innovationspace.ansys.com\\\/forum\\\/\"},{\"@type\":\"WebPage\",\"@id\":\"https:\\\/\\\/innovationspace.ansys.com\\\/forum\\\/forums\\\/topic\\\/mortar-contact-behavior-unaffected-by-igap\\\/#webpage\",\"url\":\"https:\\\/\\\/innovationspace.ansys.com\\\/forum\\\/forums\\\/topic\\\/mortar-contact-behavior-unaffected-by-igap\\\/\",\"name\":\"Mortar contact behavior unaffected by IGAP | Ansys Learning Forum\",\"description\":\"Hi All,I'm currently setting up\\\/calibrating a model to represent nonlinear cyclic behavior of masonry in LS Dyna implicit. 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I am representing joints with *CONTACT_AUTOMATIC_SURFACE_TO_SURFACE_TIEBREAK_MORTAR_ID option.EQ.7. When I was tested the normal force-displacement behavior of the contact\/masonry assembly using a displacement controlled BPM, I observed some non-physical comressive behavior with significant penetrations of the contact interface.","canonical_url":"https:\/\/innovationspace.ansys.com\/forum\/forums\/topic\/mortar-contact-behavior-unaffected-by-igap\/","robots":"max-image-preview:large","keywords":"","webmasterTools":{"miscellaneous":""},"schema":{"@context":"https:\/\/schema.org","@graph":[{"@type":"BreadcrumbList","@id":"https:\/\/innovationspace.ansys.com\/forum\/forums\/topic\/mortar-contact-behavior-unaffected-by-igap\/#breadcrumblist","itemListElement":[{"@type":"ListItem","@id":"https:\/\/innovationspace.ansys.com\/forum#listItem","position":1,"name":"Home","item":"https:\/\/innovationspace.ansys.com\/forum","nextItem":{"@type":"ListItem","@id":"https:\/\/innovationspace.ansys.com\/forum\/topics\/#listItem","name":"Topics"}},{"@type":"ListItem","@id":"https:\/\/innovationspace.ansys.com\/forum\/topics\/#listItem","position":2,"name":"Topics","item":"https:\/\/innovationspace.ansys.com\/forum\/topics\/","nextItem":{"@type":"ListItem","@id":"https:\/\/innovationspace.ansys.com\/forum\/forums\/topic-tag\/contact\/#listItem","name":"contact"},"previousItem":{"@type":"ListItem","@id":"https:\/\/innovationspace.ansys.com\/forum#listItem","name":"Home"}},{"@type":"ListItem","@id":"https:\/\/innovationspace.ansys.com\/forum\/forums\/topic-tag\/contact\/#listItem","position":3,"name":"contact","item":"https:\/\/innovationspace.ansys.com\/forum\/forums\/topic-tag\/contact\/","nextItem":{"@type":"ListItem","@id":"https:\/\/innovationspace.ansys.com\/forum\/forums\/topic\/mortar-contact-behavior-unaffected-by-igap\/#listItem","name":"Mortar contact behavior unaffected by IGAP"},"previousItem":{"@type":"ListItem","@id":"https:\/\/innovationspace.ansys.com\/forum\/topics\/#listItem","name":"Topics"}},{"@type":"ListItem","@id":"https:\/\/innovationspace.ansys.com\/forum\/forums\/topic\/mortar-contact-behavior-unaffected-by-igap\/#listItem","position":4,"name":"Mortar contact behavior unaffected by IGAP","previousItem":{"@type":"ListItem","@id":"https:\/\/innovationspace.ansys.com\/forum\/forums\/topic-tag\/contact\/#listItem","name":"contact"}}]},{"@type":"Organization","@id":"https:\/\/innovationspace.ansys.com\/forum\/#organization","name":"Ansys Learning Forum","description":"Ansys Innovation Space","url":"https:\/\/innovationspace.ansys.com\/forum\/"},{"@type":"WebPage","@id":"https:\/\/innovationspace.ansys.com\/forum\/forums\/topic\/mortar-contact-behavior-unaffected-by-igap\/#webpage","url":"https:\/\/innovationspace.ansys.com\/forum\/forums\/topic\/mortar-contact-behavior-unaffected-by-igap\/","name":"Mortar contact behavior unaffected by IGAP | Ansys Learning Forum","description":"Hi All,I'm currently setting up\/calibrating a model to represent nonlinear cyclic behavior of masonry in LS Dyna implicit. 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When I was tested the normal force-displacement behavior of the contact\/masonry assembly using a displacement controlled BPM, I observed some non-physical comressive behavior with significant penetrations of the contact interface.","inLanguage":"en-US","isPartOf":{"@id":"https:\/\/innovationspace.ansys.com\/forum\/#website"},"breadcrumb":{"@id":"https:\/\/innovationspace.ansys.com\/forum\/forums\/topic\/mortar-contact-behavior-unaffected-by-igap\/#breadcrumblist"},"datePublished":"2024-08-30T21:11:56+00:00","dateModified":"2024-08-30T21:11:56+00:00"},{"@type":"WebSite","@id":"https:\/\/innovationspace.ansys.com\/forum\/#website","url":"https:\/\/innovationspace.ansys.com\/forum\/","name":"Ansys Learning Forum","description":"Ansys Innovation Space","inLanguage":"en-US","publisher":{"@id":"https:\/\/innovationspace.ansys.com\/forum\/#organization"}}]},"og:locale":"en_US","og:site_name":"Ansys Learning Forum | Ansys Innovation Space","og:type":"article","og:title":"Mortar contact behavior unaffected by IGAP | Ansys Learning Forum","og:description":"Hi All,I'm currently setting up\/calibrating a model to represent nonlinear cyclic behavior of masonry in LS Dyna implicit. 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I am representing joints with *CONTACT_AUTOMATIC_SURFACE_TO_SURFACE_TIEBREAK_MORTAR_ID option.EQ.7. When I was tested the normal force-displacement behavior of the contact\/masonry assembly using a displacement controlled BPM, I observed some non-physical comressive behavior with significant penetrations of the contact interface.","twitter:image":"https:\/\/innovationspace.ansys.com\/forum\/wp-content\/uploads\/sites\/2\/2024\/08\/30-08-2024-1725052035-cyclic_normalDir_masonry.jpg"},"aioseo_meta_data":{"post_id":"381232","title":null,"description":null,"keywords":null,"keyphrases":null,"primary_term":null,"canonical_url":null,"og_title":null,"og_description":null,"og_object_type":"default","og_image_type":"content","og_image_url":null,"og_image_width":null,"og_image_height":null,"og_image_custom_url":null,"og_image_custom_fields":null,"og_video":null,"og_custom_url":null,"og_article_section":null,"og_article_tags":null,"twitter_use_og":true,"twitter_card":"default","twitter_image_type":"default","twitter_image_url":null,"twitter_image_custom_url":null,"twitter_image_custom_fields":null,"twitter_title":null,"twitter_description":null,"schema":{"blockGraphs":[],"customGraphs":[],"default":{"data":{"Article":[],"Course":[],"Dataset":[],"FAQPage":[],"Movie":[],"Person":[],"Product":[],"ProductReview":[],"Car":[],"Recipe":[],"Service":[],"SoftwareApplication":[],"WebPage":[]},"graphName":"","isEnabled":true},"graphs":[]},"schema_type":"default","schema_type_options":null,"pillar_content":false,"robots_default":true,"robots_noindex":false,"robots_noarchive":false,"robots_nosnippet":false,"robots_nofollow":false,"robots_noimageindex":false,"robots_noodp":false,"robots_notranslate":false,"robots_max_snippet":null,"robots_max_videopreview":null,"robots_max_imagepreview":"large","priority":null,"frequency":null,"local_seo":null,"limit_modified_date":false,"created":"2024-10-28 16:30:40","updated":"2024-10-28 16:30:40","ai":null,"breadcrumb_settings":null,"seo_analyzer_scan_date":null},"aioseo_breadcrumb":"<div class=\"aioseo-breadcrumbs\"><span class=\"aioseo-breadcrumb\">\n\t\t\t<a href=\"https:\/\/innovationspace.ansys.com\/forum\" title=\"Home\">Home<\/a>\n\t\t<\/span><span class=\"aioseo-breadcrumb-separator\">&raquo;<\/span><span class=\"aioseo-breadcrumb\">\n\t\t\t<a href=\"https:\/\/innovationspace.ansys.com\/forum\/topics\/\" title=\"Topics\">Topics<\/a>\n\t\t<\/span><span class=\"aioseo-breadcrumb-separator\">&raquo;<\/span><span class=\"aioseo-breadcrumb\">\n\t\t\t<a href=\"https:\/\/innovationspace.ansys.com\/forum\/forums\/topic-tag\/contact\/\" title=\"contact\">contact<\/a>\n\t\t<\/span><span class=\"aioseo-breadcrumb-separator\">&raquo;<\/span><span class=\"aioseo-breadcrumb\">\n\t\t\tMortar contact behavior unaffected by IGAP\n\t\t<\/span><\/div>","aioseo_breadcrumb_json":[{"label":"Home","link":"https:\/\/innovationspace.ansys.com\/forum"},{"label":"Topics","link":"https:\/\/innovationspace.ansys.com\/forum\/topics\/"},{"label":"contact","link":"https:\/\/innovationspace.ansys.com\/forum\/forums\/topic-tag\/contact\/"},{"label":"Mortar contact behavior unaffected by IGAP","link":"https:\/\/innovationspace.ansys.com\/forum\/forums\/topic\/mortar-contact-behavior-unaffected-by-igap\/"}],"acf":[],"custom_fields":[{"0":{"_bbp_subscription":["348251"],"_bbp_author_ip":["2620:cc:8000:c22::bbc7"],"_btv_view_count":["842"],"_bbp_topic_status":["unanswered"],"_edit_lock":["1726066901:348251"],"_bbp_topic_id":["381232"],"_bbp_forum_id":["27814"],"_bbp_engagement":["348251"],"_bbp_voice_count":["1"],"_bbp_reply_count":["1"],"_bbp_last_reply_id":["382343"],"_bbp_last_active_id":["382343"],"_bbp_last_active_time":["2024-09-11 15:00:26"]},"test":"gcongdonbuffalo-edu"}],"_links":{"self":[{"href":"https:\/\/innovationspace.ansys.com\/forum\/wp-json\/wp\/v2\/topics\/381232","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\/381232\/revisions"}],"wp:attachment":[{"href":"https:\/\/innovationspace.ansys.com\/forum\/wp-json\/wp\/v2\/media?parent=381232"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}