Greetings, <\/p>\n
I have a silicone-rubber type material that I have had a lab perform Dynamic Mechanical Analysis on. The data they have provided me is Shear Complex Modulus (storage and loss moduli) over a frequency range. <\/p>\n
I would like to model this material in ANSYS mechanical, but first I need to validate the lab data by running a displacement sweep and comparing the force response with the force response in the lab data.<\/p>\n
I have used MATLAB to curve fit the data, pulling out the G_e, G_i and T_i terms, thus allowing me to plot the Prony Series, G(t), the shear relaxation as a function of time. <\/p>\n
I have entered the G(t) at 22degC data into a new ANSYS material and I have now tried to run the same DMA displacment vs freq test as a Harmonic Response analysis, AND a single sin freq vibration Transient Structural analysis. In both cases my force response is much (10x) lower than the force response from my lab data.<\/p>\n
Any ideas? Are Harmonic Response and Transient Structural not appropriate for Viscoelastic materials?<\/p>\n
A clue that something might be off is that in both analyses, i got an error saying the material model was missing Linear Elastic data. I had that data in both shear and compression so I added it, in both Harmonic and Transient the simulation then completed, but I beleive I should be able to do this DMA simulation with just shear relaxation data, not quasi static linear elastic data.<\/p>\n","protected":false},"template":"","class_list":["post-252920","topic","type-topic","status-closed","hentry","topic-tag-harmonic-response","topic-tag-material-models","topic-tag-viscoelastic-simulation-2","topic-tag-viscosity"],"aioseo_notices":[],"acf":[],"custom_fields":[{"0":{"_bbp_author_ip":["23.192.164.14"],"_bbp_subscription":["264422","88","55873"],"_btv_view_count":["1237"],"_edit_lock":["1678219824:192961"],"_bbp_topic_status":["unanswered"],"_bbp_status":["publish"],"_bbp_topic_id":["252920"],"_bbp_forum_id":["27791"],"_bbp_engagement":["88","264422"],"_bbp_voice_count":["2"],"_bbp_reply_count":["1"],"_bbp_reply_count_hidden":["1"],"_bbp_last_reply_id":["253052"],"_bbp_last_active_id":["253052"],"_bbp_last_active_time":["2023-03-08 13:04:36"]},"test":"mmayoechodyne-com"}],"_links":{"self":[{"href":"https:\/\/innovationspace.ansys.com\/forum\/wp-json\/wp\/v2\/topics\/252920","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\/252920\/revisions"}],"wp:attachment":[{"href":"https:\/\/innovationspace.ansys.com\/forum\/wp-json\/wp\/v2\/media?parent=252920"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}