{"id":285256,"date":"2023-05-23T11:47:12","date_gmt":"2023-05-23T11:47:12","guid":{"rendered":"\/forum\/forums\/reply\/285256\/"},"modified":"2023-05-23T11:47:12","modified_gmt":"2023-05-23T11:47:12","slug":"285256","status":"publish","type":"reply","link":"https:\/\/innovationspace.ansys.com\/forum\/forums\/reply\/285256\/","title":{"rendered":"Reply To: Difference between SPG IDAM=1 and MAT_ADD_DAMAGE"},"content":{"rendered":"<p>&lt;p&gt;Sorry, but I don&#8217;t understand you at all. In this post, I am asking about MAT_ADD_EROSION, but not about MAT_ADD_DAMAGE or any damage at all.&lt;\/p&gt;&lt;p&gt;&#8221;IDAM controls the mechanism of damage where as MAT_ADD_DAMAGE controls the criteria for the material&#8221; &#8211; as I understand IDAM controls failure criteria too by parameters FS and STRETCH. Different IDAM values control the failure quantity that will be assessed (plastic strain (IDAM=1), shear strain (IDAM=3), etc). Therefore I don&#8217;t need MAT_ADD_EROSION or another cards to simulate material failure for the case MAT_24 + IDAM=1.&lt;\/p&gt;&lt;p&gt;&#8221;for MAT_24 with IDAM 1 has to be used and it is coherent to plastic strain defined in that material card and you dont need to define the FS vale again in the section cards&#8221; &#8211; why?? In MAT_024 we define only the yield stress vs. plastic strain (hardening rule) and therefore we have to set the failure criterion inside SECTION_SOLID_SPG, right? I use ANSYS 2023R1 (LS-Dyna R13.1), maybe it is important&#8230;&lt;\/p&gt;&lt;p&gt;&#8221;Moreover, MAT_24 is not good for brittle materials&#8221; &#8211; this is my main question &#8211; why I can not model brittle material if I set very very small value of critical plastic strain (parameter FS)? Since this value is very small the fracture should be the same as if I define the critical stress in MAT_ADD_EROSION.&lt;\/p&gt;&lt;p&gt;BUT when I tried this I found that material crushing looks very different for these two options. I am wondering because SPG bond breakage follows the same rule &#8211; FS &gt; FS_critical &amp; STRETCH &gt; STRETCH_critical.&lt;\/p&gt;<\/p>\n","protected":false},"template":"","class_list":["post-285256","reply","type-reply","status-publish","hentry"],"aioseo_notices":[],"aioseo_head":"\n\t\t<!-- All in One SEO 4.9.10 - aioseo.com -->\n\t<meta name=\"description\" content=\"Sorry, but I don&#039;t understand you at all. In this post, I am asking about MAT_ADD_EROSION, but not about MAT_ADD_DAMAGE or any damage at all.&quot;IDAM controls the mechanism of damage where as MAT_ADD_DAMAGE controls the criteria for the material&quot; - as I understand IDAM controls failure criteria too by parameters FS and STRETCH. Different IDAM\" \/>\n\t<meta name=\"robots\" content=\"max-image-preview:large\" \/>\n\t<link rel=\"canonical\" href=\"https:\/\/innovationspace.ansys.com\/forum\/forums\/reply\/285256\/\" \/>\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=\"Reply To: Difference between SPG IDAM=1 and MAT_ADD_DAMAGE | Ansys Learning Forum\" \/>\n\t\t<meta property=\"og:description\" content=\"Sorry, but I don&#039;t understand you at all. In this post, I am asking about MAT_ADD_EROSION, but not about MAT_ADD_DAMAGE or any damage at all.&quot;IDAM controls the mechanism of damage where as MAT_ADD_DAMAGE controls the criteria for the material&quot; - as I understand IDAM controls failure criteria too by parameters FS and STRETCH. Different IDAM\" \/>\n\t\t<meta property=\"og:url\" content=\"https:\/\/innovationspace.ansys.com\/forum\/forums\/reply\/285256\/\" \/>\n\t\t<meta property=\"article:published_time\" content=\"2023-05-23T11:47:12+00:00\" \/>\n\t\t<meta property=\"article:modified_time\" content=\"2023-05-23T11:47:12+00:00\" \/>\n\t\t<meta name=\"twitter:card\" content=\"summary_large_image\" \/>\n\t\t<meta name=\"twitter:title\" content=\"Reply To: Difference between SPG IDAM=1 and MAT_ADD_DAMAGE | Ansys Learning Forum\" \/>\n\t\t<meta name=\"twitter:description\" content=\"Sorry, but I don&#039;t understand you at all. In this post, I am asking about MAT_ADD_EROSION, but not about MAT_ADD_DAMAGE or any damage at all.&quot;IDAM controls the mechanism of damage where as MAT_ADD_DAMAGE controls the criteria for the material&quot; - as I understand IDAM controls failure criteria too by parameters FS and STRETCH. 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In this post, I am asking about MAT_ADD_EROSION, but not about MAT_ADD_DAMAGE or any damage at all.\\\"IDAM controls the mechanism of damage where as MAT_ADD_DAMAGE controls the criteria for the material\\\" - as I understand IDAM controls failure criteria too by parameters FS and STRETCH. 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In this post, I am asking about MAT_ADD_EROSION, but not about MAT_ADD_DAMAGE or any damage at all.\"IDAM controls the mechanism of damage where as MAT_ADD_DAMAGE controls the criteria for the material\" - as I understand IDAM controls failure criteria too by parameters FS and STRETCH. 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In this post, I am asking about MAT_ADD_EROSION, but not about MAT_ADD_DAMAGE or any damage at all.\"IDAM controls the mechanism of damage where as MAT_ADD_DAMAGE controls the criteria for the material\" - as I understand IDAM controls failure criteria too by parameters FS and STRETCH. 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In this post, I am asking about MAT_ADD_EROSION, but not about MAT_ADD_DAMAGE or any damage at all.&quot;IDAM controls the mechanism of damage where as MAT_ADD_DAMAGE controls the criteria for the material&quot; - as I understand IDAM controls failure criteria too by parameters FS and STRETCH. Different IDAM","og:url":"https:\/\/innovationspace.ansys.com\/forum\/forums\/reply\/285256\/","article:published_time":"2023-05-23T11:47:12+00:00","article:modified_time":"2023-05-23T11:47:12+00:00","twitter:card":"summary_large_image","twitter:title":"Reply To: Difference between SPG IDAM=1 and MAT_ADD_DAMAGE | Ansys Learning Forum","twitter:description":"Sorry, but I don't understand you at all. In this post, I am asking about MAT_ADD_EROSION, but not about MAT_ADD_DAMAGE or any damage at all.&quot;IDAM controls the mechanism of damage where as MAT_ADD_DAMAGE controls the criteria for the material&quot; - as I understand IDAM controls failure criteria too by parameters FS and STRETCH. 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