{"id":44455,"date":"2020-05-27T15:40:11","date_gmt":"2020-05-27T15:40:11","guid":{"rendered":"\/forum\/forums\/topic\/fibre-volume-fractions-of-library-values\/"},"modified":"2020-05-27T15:40:11","modified_gmt":"2020-05-27T15:40:11","slug":"fibre-volume-fractions-of-library-values","status":"closed","type":"topic","link":"https:\/\/innovationspace.ansys.com\/forum\/forums\/topic\/fibre-volume-fractions-of-library-values\/","title":{"rendered":"Fibre volume fractions of library values?"},"content":{"rendered":"

Hi,<\/p>\n

<\/p>\n

I am using the material properties (taken from the ‘composite materials’ ‘Data Sources’) below in a static structural analysis:<\/p>\n

<\/p>\n

\"\"<\/p>\n

<\/p>\n

The ‘Epoxy E-Glass Wet’ ply type is listed as ‘Regular’ but it must be UD since Ex > (Ey = Ez)<\/p>\n

<\/p>\n

I am assuming that ‘Wet’ means not pre-preg (as in Hand LayUp &\/or Vac Bagged etc)<\/p>\n

<\/p>\n

I am trying to find out which FVF (Vf, fibre volume fractions) each of these material properties correspond to<\/p>\n

<\/p>\n

Up to now I have been using the equation linking the densities of the constituent materials (epoxy, E-glass and 230GPa Carbon) with the composite density to estimate the FVF’s of these composites from the given composite densities:<\/p>\n

<\/p>\n

Density Composite = (Density Fibres*FVF) + [Density Resin*(1-FVF)]<\/p>\n

<\/p>\n

This has given me the following (ESTIMATED<\/strong><\/em>) FVF’s:<\/p>\n

<\/p>\n

Epoxy E-Glass WET (must be UD)          FVF ≈ 0.50
Epoxy Carbon UD (230 Gpa) Wet           FVF ≈ 0.65
Epoxy Carbon Woven (230 Gpa) Wet     FVF ≈ 0.55<\/p>\n

<\/p>\n

These seem reasonable values, depending on the exact production method used in each case<\/p>\n

<\/p>\n

However, the equation above does not consider voids etc (which depend heavily on the production process, so calculating or estimating them is difficult) and hence can only give estimates<\/p>\n

<\/p>\n

So, my question is …<\/p>\n

<\/p>\n

Does anyone have any more info on the basis of these material property values (especially concerning FVF and production method) &\/or can point me in the right directions to find out?<\/p>\n

<\/p>\n

Thanks<\/p>\n","protected":false},"template":"","class_list":["post-44455","topic","type-topic","status-closed","hentry"],"aioseo_notices":[],"acf":[],"custom_fields":[{"0":{"_bbp_old_topic_id":["16636"],"_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"],"_btv_view_count":["1516"],"_bbp_subscription":["250551"],"_bbp_topic_status":["unanswered"],"_bbp_status":["publish"],"_bbp_topic_id":["44455"],"_bbp_forum_id":["27791"],"_bbp_engagement":["176387"],"_bbp_voice_count":["1"],"_bbp_reply_count":["0"],"_bbp_last_reply_id":["0"],"_bbp_last_active_id":["44455"],"_bbp_last_active_time":["2020-05-27 15:40:11"]},"test":"leigh"}],"_links":{"self":[{"href":"https:\/\/innovationspace.ansys.com\/forum\/wp-json\/wp\/v2\/topics\/44455","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\/44455\/revisions"}],"wp:attachment":[{"href":"https:\/\/innovationspace.ansys.com\/forum\/wp-json\/wp\/v2\/media?parent=44455"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}