{"id":165107,"date":"2023-03-17T08:59:25","date_gmt":"2023-03-17T08:59:25","guid":{"rendered":"\/knowledge\/forums\/topic\/what-are-the-benefits-of-mat_089-mat_plasticity_polymer-over-mat_024-for-modeling-polymers\/"},"modified":"2023-07-31T12:30:36","modified_gmt":"2023-07-31T12:30:36","slug":"what-are-the-benefits-of-mat_089-mat_plasticity_polymer-over-mat_024-for-modeling-polymers","status":"publish","type":"topic","link":"https:\/\/innovationspace.ansys.com\/knowledge\/forums\/topic\/what-are-the-benefits-of-mat_089-mat_plasticity_polymer-over-mat_024-for-modeling-polymers\/","title":{"rendered":"What are the benefits of MAT_089 (*MAT_PLASTICITY_POLYMER) over MAT_024 for modeling polymers?"},"content":{"rendered":"<p>1) For polymers it can be difficult to separate the elastic strain from the plastic strain (as you would have to do to prepare the input curve for MAT_024 from a tensile test result) because the stress-vs-total strain curve at high strain values can be steeper than the initial elastic modulus. In those cases, it is easier to input the stress-vs-total strain curve as with MAT_089.  2) MAT_089\u00e2\u20ac\u2122s ability to have failure strain as a function of strain rate is useful for polymers, some of which become more brittle at high strain rates.  3) Unlike MAT_024, the hardening slope of MAT_089 can be larger than the initial modulus. The unloading\/reloading stiffness of MAT_089 is equal to the maximum tangent stiffness attained before the unloading occurs. On the other hand, MAT_024 unloads\/reloads always with the initial modulus, therefore, the hardening slope in the MAT_024 should not exceed the initial modulus.   4) In years gone by, before *MAT_ADD_EROSION was added to the code, MAT_089\u00e2\u20ac\u2122s basing failure on the maximum principal strain (rather than plastic strain) would have been a fourth point on the list.  Additional information can be found in the remarks for *MAT_PLASTICITY_POLYMER in the LS-DYNA Manual Volume II.<\/p>\n","protected":false},"template":"","class_list":["post-165107","topic","type-topic","status-publish","hentry","topic-tag-ls-dyna","topic-tag-ls-dyna-suite","topic-tag-lsdyna","topic-tag-structural-mechanics"],"aioseo_notices":[],"acf":[],"custom_fields":[{"0":{"_wp_page_template":["default"],"_bbp_last_active_time":["3\/15\/2023 20:20"],"_bbp_forum_id":["27789"],"_bbp_author_ip":["23.56.168.180"],"_btv_view_count":["1879"],"siebel_km_number":["2068330"],"product_version":[""],"km_published_date":["2022-07-29T00:00:00.000Z"],"family":["Structural Mechanics"],"application_name":["LS-DYNA Suite"]},"test":"articlesansys-com"}],"_links":{"self":[{"href":"https:\/\/innovationspace.ansys.com\/knowledge\/wp-json\/wp\/v2\/topics\/165107","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/innovationspace.ansys.com\/knowledge\/wp-json\/wp\/v2\/topics"}],"about":[{"href":"https:\/\/innovationspace.ansys.com\/knowledge\/wp-json\/wp\/v2\/types\/topic"}],"version-history":[{"count":0,"href":"https:\/\/innovationspace.ansys.com\/knowledge\/wp-json\/wp\/v2\/topics\/165107\/revisions"}],"wp:attachment":[{"href":"https:\/\/innovationspace.ansys.com\/knowledge\/wp-json\/wp\/v2\/media?parent=165107"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}