RE: VUMAT for Ogden hyperelasticity
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You need to calculate the entire stress tensor based on the given deformation gradient. You can’t assume that any of the components are zero. See the Abaqus Theory sections on hyperelasticity. Regards, Dave Lindeman Staff Scientist Corporate Research Systems Laboratory 3M Center 235-3G-08 St. Paul, MN 55144 651-733-6383 From: [email protected] [mailto:[email protected]] Sent: Thursday, November 01, 2018 4:21 AM To: [email protected] Subject: [EXTERNAL] [Abaqus] VUMAT for Ogden hyperelasticity hi I'm Msc student of mechanical engineering. I work on fatigue behavior of polymer. I wrote vumat for implementation of ogden hyperelastic . my vumat have good result for one element but for more than 8 elements my model distort excessively. I model a cube and push it with a pressure boundry condition. I set zero the component of 4 5 6 (shear component) of stressNew in my vumat manually but when I run my vumat I see large shear stress in my model. does abaqus change stress outside the vumat? I use abaqus 6.14-2 fortran2013 and visual studio 2012. ________________________________ 3M Notice: This communication is from an [EXTERNAL] sender. If this email looks suspicious, do NOT click or open any links or attachments in the email. To report a suspicious email, click on the Report Phishing – PhishMe icon in the Outlook ribbon or forward this email using the report email as spam link in the text below. Click here<https://spam.mmm.com/pem/pages/digestProcess/digestProcess.jsf?content=aedaaa864ecbae94980a907f945ed29ebe35078ed30859ca69893b9b62f4a846c6c4ff5fb22097b592aab29dac82584f30f60c161a797f8d8d8a621478a2f25250f75f3a4b570e12125b08ef0dd8e5d1dbc7a045714a146255659761471276b9c37b570f20a98a734732948327931bff93d08ba9b6d561fe7c0899c2b004e54a17d051a1b719785d> to report this email as spam [Non-text portions of this message have been removed]