{"id":393479,"date":"2024-11-10T21:51:27","date_gmt":"2024-11-10T21:51:27","guid":{"rendered":"https:\/\/innovationspace.ansys.com\/forum\/forums\/topic\/stress-strain-curve-4\/"},"modified":"2024-11-10T21:51:27","modified_gmt":"2024-11-10T21:51:27","slug":"stress-strain-curve-4","status":"publish","type":"topic","link":"https:\/\/innovationspace.ansys.com\/forum\/forums\/topic\/stress-strain-curve-4\/","title":{"rendered":"STRESS STRAIN CURVE"},"content":{"rendered":"<p>&lt;p&gt;Hello. I performed two simulations of the tension of a metal sample in the LS-Dyna program using a material model called mat018 &#8220;Power Law&#8221; and noticed that the stress-strain graph in simulation &#8220;B&#8221; is not rounded (smooth) as in simulation &#8220;A&#8221;. The lack of smoothness (rounding) occurs at the yield point, i.e. where the material changes from an elastic state to a plastic state. I also noticed that changing the density of the material to a lower one improves the rounding of the stress-strain curve (both effective values). Are there any settings (apart from density) that improve the smoothness of the function at the yield point?&lt;\/p&gt;&lt;p&gt;<img decoding=\"async\" src=\"https:\/\/innovationspace.ansys.com\/forum\/wp-content\/uploads\/sites\/2\/2024\/11\/10-11-2024-1731275236-1.jpg\" alt=\"\" \/>&lt;\/p&gt;<\/p>\n","protected":false},"template":"","class_list":["post-393479","topic","type-topic","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=\"Hello. I performed two simulations of the tension of a metal sample in the LS-Dyna program using a material model called mat018 &quot;Power Law&quot; and noticed that the stress-strain graph in simulation &quot;B&quot; is not rounded (smooth) as in simulation &quot;A&quot;. The lack of smoothness (rounding) occurs at the yield point, i.e. where the material\" \/>\n\t<meta name=\"robots\" content=\"max-image-preview:large\" \/>\n\t<link rel=\"canonical\" href=\"https:\/\/innovationspace.ansys.com\/forum\/forums\/topic\/stress-strain-curve-4\/\" \/>\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=\"STRESS STRAIN CURVE | Ansys Learning Forum\" \/>\n\t\t<meta property=\"og:description\" content=\"Hello. I performed two simulations of the tension of a metal sample in the LS-Dyna program using a material model called mat018 &quot;Power Law&quot; and noticed that the stress-strain graph in simulation &quot;B&quot; is not rounded (smooth) as in simulation &quot;A&quot;. The lack of smoothness (rounding) occurs at the yield point, i.e. where the material\" \/>\n\t\t<meta property=\"og:url\" content=\"https:\/\/innovationspace.ansys.com\/forum\/forums\/topic\/stress-strain-curve-4\/\" \/>\n\t\t<meta property=\"article:published_time\" content=\"2024-11-10T21:51:27+00:00\" \/>\n\t\t<meta property=\"article:modified_time\" content=\"2024-11-10T21:51:27+00:00\" \/>\n\t\t<meta name=\"twitter:card\" content=\"summary_large_image\" \/>\n\t\t<meta name=\"twitter:title\" content=\"STRESS STRAIN CURVE | Ansys Learning Forum\" \/>\n\t\t<meta name=\"twitter:description\" content=\"Hello. I performed two simulations of the tension of a metal sample in the LS-Dyna program using a material model called mat018 &quot;Power Law&quot; and noticed that the stress-strain graph in simulation &quot;B&quot; is not rounded (smooth) as in simulation &quot;A&quot;. The lack of smoothness (rounding) occurs at the yield point, i.e. where the material\" \/>\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\\\/stress-strain-curve-4\\\/#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\\\/stress-strain-curve-4\\\/#listItem\",\"name\":\"STRESS STRAIN CURVE\"},\"previousItem\":{\"@type\":\"ListItem\",\"@id\":\"https:\\\/\\\/innovationspace.ansys.com\\\/forum#listItem\",\"name\":\"Home\"}},{\"@type\":\"ListItem\",\"@id\":\"https:\\\/\\\/innovationspace.ansys.com\\\/forum\\\/forums\\\/topic\\\/stress-strain-curve-4\\\/#listItem\",\"position\":3,\"name\":\"STRESS STRAIN CURVE\",\"previousItem\":{\"@type\":\"ListItem\",\"@id\":\"https:\\\/\\\/innovationspace.ansys.com\\\/forum\\\/topics\\\/#listItem\",\"name\":\"Topics\"}}]},{\"@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\\\/stress-strain-curve-4\\\/#webpage\",\"url\":\"https:\\\/\\\/innovationspace.ansys.com\\\/forum\\\/forums\\\/topic\\\/stress-strain-curve-4\\\/\",\"name\":\"STRESS STRAIN CURVE | Ansys Learning Forum\",\"description\":\"Hello. 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I performed two simulations of the tension of a metal sample in the LS-Dyna program using a material model called mat018 &quot;Power Law&quot; and noticed that the stress-strain graph in simulation &quot;B&quot; is not rounded (smooth) as in simulation &quot;A&quot;. The lack of smoothness (rounding) occurs at the yield point, i.e. where the material","og:url":"https:\/\/innovationspace.ansys.com\/forum\/forums\/topic\/stress-strain-curve-4\/","article:published_time":"2024-11-10T21:51:27+00:00","article:modified_time":"2024-11-10T21:51:27+00:00","twitter:card":"summary_large_image","twitter:title":"STRESS STRAIN CURVE | Ansys Learning Forum","twitter:description":"Hello. I performed two simulations of the tension of a metal sample in the LS-Dyna program using a material model called mat018 &quot;Power Law&quot; and noticed that the stress-strain graph in simulation &quot;B&quot; is not rounded (smooth) as in simulation &quot;A&quot;. 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