{"id":30322,"date":"2018-09-06T15:20:23","date_gmt":"2018-09-06T15:20:23","guid":{"rendered":"\/forum\/forums\/topic\/modelling-visco-elastic-material-for-harmonic-response-analysis\/"},"modified":"2018-09-06T15:20:23","modified_gmt":"2018-09-06T15:20:23","slug":"modelling-visco-elastic-material-for-harmonic-response-analysis","status":"closed","type":"topic","link":"https:\/\/innovationspace.ansys.com\/forum\/forums\/topic\/modelling-visco-elastic-material-for-harmonic-response-analysis\/","title":{"rendered":"Modelling visco-elastic material for harmonic response analysis"},"content":{"rendered":"

Hi everybody,<\/p>\n

<\/p>\n

I’m trying to model a 100×100 mm sandwich composed by 3 layer:<\/p>\n

<\/p>\n

1. Steel sheet, 3 mm thick<\/p>\n

<\/p>\n

2. Viscoelastic polymer, 1 mm thick<\/p>\n

<\/p>\n

3. Steel sheet, 3 mm thick<\/p>\n

<\/p>\n

I need to evaluate the damping effect of the application of 3 mm thick steel sheet with polymer on the FRF of the 3 mm plate. The surfaces are sticked togheter.<\/p>\n

<\/p>\n

I got the complex modulus G’ and loss factor from DMA experimental analysis. I try to follow the help, ANSYS Documentation -> Mech APDL -> Material Reference -> Non Linear Material Properties -> Viscoelasticity, in particular from 4.7.3 paragraph. Unfortunately, i don’t see any change on the model results.. Could someone help me?<\/p>\n

<\/p>\n

This is the command (APDL) that I used to define the material. Polymer is the name selection.<\/p>\n

<\/p>\n

mat_num=2<\/p>\n

<\/p>\n

MP, EX, mat_num, 0.5E+05<\/p>\n

<\/p>\n

MP, NUXY, mat_num, 0.49<\/p>\n

<\/p>\n

MP, DENS, mat_num, 1E-09<\/p>\n

<\/p>\n

 <\/p>\n

<\/p>\n

TB, EXPE, mat_num, 1, 10, GMODULUS<\/p>\n

<\/p>\n

TBTEMP, 22<\/p>\n

<\/p>\n

TBPT, DEFI, 0.1, 70000, 34300, 0<\/p>\n

<\/p>\n

TBPT, DEFI, 0.2, 90000, 53100, 0<\/p>\n

<\/p>\n

TBPT, DEFI, 0.5, 110000, 75900, 0<\/p>\n

<\/p>\n

TBPT, DEFI, 1.0, 150000, 119000, 0 <\/p>\n

<\/p>\n

TBPT, DEFI, 2.0, 200000, 170000, 0<\/p>\n

<\/p>\n

TBPT, DEFI, 3.0, 225000, 207000, 0 <\/p>\n

<\/p>\n

TBPT, DEFI, 10, 400000, 396000, 0<\/p>\n

<\/p>\n

TBPT, DEFI, 100, 1700000, 1700000, 0<\/p>\n

<\/p>\n

TBPT, DEFI, 500, 4000000, 3600000, 0 <\/p>\n

<\/p>\n

TBPT, DEFI, 9000, 20000000, 14000000, 0<\/p>\n

<\/p>\n

 <\/p>\n

<\/p>\n

TB, PRONY, mat_num, , EXPERIMENTAL<\/p>\n

<\/p>\n

 <\/p>\n

<\/p>\n

CMSEL, S, Polymer, ELEM<\/p>\n

<\/p>\n

EMODIF, ALL, MAT, 2<\/p>\n

<\/p>\n

 <\/p>\n

<\/p>\n

ALLSEL<\/p>\n

<\/p>\n

\/solu<\/p>\n","protected":false},"template":"","class_list":["post-30322","topic","type-topic","status-closed","hentry"],"aioseo_notices":[],"acf":[],"custom_fields":[{"0":{"_bbp_old_topic_id":["2491"],"_bbp_old_topic_author_name_id":["Anonymous"],"_bbp_old_is_topic_anonymous_id":["false"],"_bbp_old_closed_status_id":["publish"],"_bbp_author_ip":[null],"_bbp_old_sticky_status_id":["normal"],"_bbp_likes_count":["0","0","0","0","0"],"_btv_view_count":["2921"],"_bbp_subscription":["236280"],"_bbp_topic_status":["unanswered"],"_bbp_status":["publish"],"_bbp_topic_id":["30322"],"_bbp_forum_id":["27791"],"_bbp_engagement":["99","897","157252"],"_bbp_voice_count":["3"],"_bbp_reply_count":["10"],"_bbp_last_reply_id":["64173"],"_bbp_last_active_id":["64173"],"_bbp_last_active_time":["2018-09-14 16:54:05"]},"test":"italicbike"}],"_links":{"self":[{"href":"https:\/\/innovationspace.ansys.com\/forum\/wp-json\/wp\/v2\/topics\/30322","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\/30322\/revisions"}],"wp:attachment":[{"href":"https:\/\/innovationspace.ansys.com\/forum\/wp-json\/wp\/v2\/media?parent=30322"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}