{"id":393349,"date":"2024-11-08T15:50:06","date_gmt":"2024-11-08T15:50:06","guid":{"rendered":"https:\/\/innovationspace.ansys.com\/forum\/forums\/topic\/inaccurate-stress-results-due-to-geometric-singularities\/"},"modified":"2024-11-08T15:50:06","modified_gmt":"2024-11-08T15:50:06","slug":"inaccurate-stress-results-due-to-geometric-singularities","status":"publish","type":"topic","link":"https:\/\/innovationspace.ansys.com\/forum\/forums\/topic\/inaccurate-stress-results-due-to-geometric-singularities\/","title":{"rendered":"Inaccurate stress results due to geometric singularities"},"content":{"rendered":"<p>&lt;p&gt;Dear all,&lt;\/p&gt;&lt;p&gt;I am conducting a 2D static structural analysis of an optical window made of sapphire, which is in direct contact with a metallic component. The model is set up with axisymmetric 2D behaviour.&lt;\/p&gt;&lt;p&gt;As shown in the attached screenshots, the mesh is refined (element size: 0.1 mm), the contact between the two parts is defined as frictionless, and pressure is applied on the red-highlighted surfaces. The optical window is cylindrical, with fillets around each flat surface.&lt;\/p&gt;&lt;p&gt;As expected, the maximum stress occurs at the base of the fillets. I suspect this is due to a geometric singularity, as the stress values increase when the mesh is refined. Despite my best efforts and research, I have not been able to mitigate this issue or obtain more accurate results.&lt;\/p&gt;&lt;p&gt;Does anyone have suggestions on how to address this? Any advice would be greatly appreciated!&lt;br&gt;&lt;br&gt;Thanking you in advance.&lt;br&gt;Julien&lt;\/p&gt;&lt;p&gt;<img loading=\"lazy\" decoding=\"async\" src=\"https:\/\/innovationspace.ansys.com\/forum\/wp-content\/uploads\/sites\/2\/2024\/11\/08-11-2024-1731075494-mceclip3.png\" width=\"667\" height=\"318\" \/> &nbsp;<img loading=\"lazy\" decoding=\"async\" src=\"https:\/\/innovationspace.ansys.com\/forum\/wp-content\/uploads\/sites\/2\/2024\/11\/08-11-2024-1731075493-mceclip0.png\" width=\"673\" height=\"318\" \/>&lt;\/p&gt;&lt;p&gt;<img loading=\"lazy\" decoding=\"async\" src=\"https:\/\/innovationspace.ansys.com\/forum\/wp-content\/uploads\/sites\/2\/2024\/11\/08-11-2024-1731075494-mceclip4.png\" width=\"1350\" height=\"641\" \/>&lt;\/p&gt;&lt;p&gt;<img loading=\"lazy\" decoding=\"async\" src=\"https:\/\/innovationspace.ansys.com\/forum\/wp-content\/uploads\/sites\/2\/2024\/11\/08-11-2024-1731075494-mceclip1.png\" width=\"676\" height=\"320\" \/> &nbsp;<img loading=\"lazy\" decoding=\"async\" src=\"https:\/\/innovationspace.ansys.com\/forum\/wp-content\/uploads\/sites\/2\/2024\/11\/08-11-2024-1731075493-mceclip2.png\" width=\"668\" height=\"316\" \/>&lt;\/p&gt;&lt;p&gt;&nbsp;&lt;\/p&gt;<\/p>\n","protected":false},"template":"","class_list":["post-393349","topic","type-topic","status-publish","hentry","topic-tag-stress-concentration","topic-tag-stress-singularity"],"aioseo_notices":[],"aioseo_head":"\n\t\t<!-- All in One SEO 4.9.10 - aioseo.com -->\n\t<meta name=\"description\" content=\"Dear all,I am conducting a 2D static structural analysis of an optical window made of sapphire, which is in direct contact with a metallic component. The model is set up with axisymmetric 2D behaviour.As shown in the attached screenshots, the mesh is refined (element size: 0.1 mm), the contact between the two parts is defined\" \/>\n\t<meta name=\"robots\" content=\"max-image-preview:large\" \/>\n\t<link rel=\"canonical\" href=\"https:\/\/innovationspace.ansys.com\/forum\/forums\/topic\/inaccurate-stress-results-due-to-geometric-singularities\/\" \/>\n\t<meta name=\"generator\" content=\"All in One SEO (AIOSEO) 4.9.10\" \/>\n\t\t<meta property=\"og:locale\" content=\"en_US\" \/>\n\t\t<meta property=\"og:site_name\" content=\"Ansys Learning Forum | Ansys Innovation Space\" \/>\n\t\t<meta property=\"og:type\" content=\"article\" \/>\n\t\t<meta property=\"og:title\" content=\"Inaccurate stress results due to geometric singularities | Ansys Learning Forum\" \/>\n\t\t<meta property=\"og:description\" content=\"Dear all,I am conducting a 2D static structural analysis of an optical window made of sapphire, which is in direct contact with a metallic component. The model is set up with axisymmetric 2D behaviour.As shown in the attached screenshots, the mesh is refined (element size: 0.1 mm), the contact between the two parts is defined\" \/>\n\t\t<meta property=\"og:url\" content=\"https:\/\/innovationspace.ansys.com\/forum\/forums\/topic\/inaccurate-stress-results-due-to-geometric-singularities\/\" \/>\n\t\t<meta property=\"article:published_time\" content=\"2024-11-08T15:50:06+00:00\" \/>\n\t\t<meta property=\"article:modified_time\" content=\"2024-11-08T15:50:06+00:00\" \/>\n\t\t<meta name=\"twitter:card\" content=\"summary_large_image\" \/>\n\t\t<meta name=\"twitter:title\" content=\"Inaccurate stress results due to geometric singularities | Ansys Learning Forum\" \/>\n\t\t<meta name=\"twitter:description\" content=\"Dear all,I am conducting a 2D static structural analysis of an optical window made of sapphire, which is in direct contact with a metallic component. 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