{"id":250395,"date":"2023-02-17T13:48:06","date_gmt":"2023-02-17T13:48:06","guid":{"rendered":"\/forum\/forums\/topic\/reporting-an-error-in-anisotropic-elasticity-matrix-calculation\/"},"modified":"2023-02-17T13:48:06","modified_gmt":"2023-02-17T13:48:06","slug":"reporting-an-error-in-anisotropic-elasticity-matrix-calculation","status":"closed","type":"topic","link":"https:\/\/innovationspace.ansys.com\/forum\/forums\/topic\/reporting-an-error-in-anisotropic-elasticity-matrix-calculation\/","title":{"rendered":"Reporting an error in Anisotropic Elasticity Matrix calculation"},"content":{"rendered":"<div style=\"color: black;font-size: 12pt;font-family: Calibri,Arial,Helvetica,sans-serif;background-color: white\">Hi!<\/div>\n<div style=\"color: black;font-size: 12pt;font-family: Calibri,Arial,Helvetica,sans-serif;background-color: white\">&nbsp;<\/div>\n<div style=\"color: black;font-size: 12pt;font-family: Calibri,Arial,Helvetica,sans-serif;background-color: white\">I want to notify you that your software calculates the D66 cell in Anisotropic Elasticity stiffness and compliance matrices incorrectly. When using Matrix Type Stiffness, Format IEEE, and Point Group 6mm, your software says that D66 = 2*(D11-D12), when in actuality it should be (D11-D12)\/2. Similarly, when using Matrix Type Compliance, Format IEEE, and Point Group 6mm, your software says that D66 = (D11-D12)\/2, when in actuality it should be 2*(D11-D12) (see <a id=\"LPlnk476869\" href=\"https:\/\/ntrs.nasa.gov\/api\/citations\/20030014725\/downloads\/20030014725.pdf\" target=\"_blank\" rel=\"noopener noreferrer\" data-auth=\"NotApplicable\" data-safelink=\"true\" data-linkindex=\"0\">https:\/\/ntrs.nasa.gov\/api\/citations\/20030014725\/downloads\/20030014725.pdf<\/a>).<\/div>\n<div style=\"color: black;font-size: 12pt;font-family: Calibri,Arial,Helvetica,sans-serif;background-color: white\">&nbsp;<\/div>\n<div style=\"color: black;font-size: 12pt;font-family: Calibri,Arial,Helvetica,sans-serif;background-color: white\">Note that the unit of the stiffness matrix C is Pa and the unit of the compliance matrix S is Pa^(-1). Thus, one cannot simply switch the matrices&#8217; names.<\/div>\n<div style=\"color: black;font-size: 12pt;font-family: Calibri,Arial,Helvetica,sans-serif;background-color: white\"><img decoding=\"async\" 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alt=\"Kuvan esikatselu\"><\/div>\n<div style=\"color: black;font-size: 12pt;font-family: Calibri,Arial,Helvetica,sans-serif;background-color: white\">I already contacted Ansys support about this error.<\/div>\n<div style=\"color: black;font-size: 12pt;font-family: Calibri,Arial,Helvetica,sans-serif;background-color: white\">&nbsp;<\/div>\n<div style=\"color: black;font-size: 12pt;font-family: Calibri,Arial,Helvetica,sans-serif;background-color: white\">Regards,<\/div>\n<div style=\"color: black;font-size: 12pt;font-family: Calibri,Arial,Helvetica,sans-serif;background-color: white\">Katja<\/div>\n","protected":false},"template":"","class_list":["post-250395","topic","type-topic","status-closed","hentry"],"aioseo_notices":[],"acf":[],"custom_fields":[{"0":{"_bbp_subscription":["272299","20905"],"_bbp_author_ip":["23.192.164.14"]," _bbp_last_reply_id":["0"]," 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17:58:02"]},"test":"katja-mustonentuni-fi"}],"_links":{"self":[{"href":"https:\/\/innovationspace.ansys.com\/forum\/wp-json\/wp\/v2\/topics\/250395","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\/250395\/revisions"}],"wp:attachment":[{"href":"https:\/\/innovationspace.ansys.com\/forum\/wp-json\/wp\/v2\/media?parent=250395"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}