Knowing the density values what is the formula for finding density of polymer composite.
Dear Prajna,
without inluding air bubbles during reinforcement procedure and excluding any chemical reactions between the constituents (i.e. avoiding any change of volume(s)) you may estimate the resulting density rhores to my opinion by
the ratio of the sum of all weights ( sum(wi) ) divided by the sum of all volumes ( sum(Vi) ) of your constituents.
rhores = sum(wi) / sum(Vi)
It is like a mixture of non-reacting constituents.
You may replace the volumes Vi by Vi = wi / rhoi so you will have:
rhores = sum(wi) / sum(Vi) = sum(wi) / sum(wi / rhoi )
and your entries are only weights wi and densities rhoi as you requested at your question. For fibres as reinforment material and your non-cured polymer composite this formula is more suitable.
Please take the appropriate data for the polymer composite (rhocomp) which you would expect after curing process.
Best regards
You may find useful to check the following discussions: https://www.researchgate.net/post/How_might_I_determine_glass_fiber_content_in_composite https://www.researchgate.net/post/composites_may_consists_of_three_different_constituent_like_Epoxy_carbon_and_glass_fiberhow_i_can_calculate_volume_and_mas_fraction_from_density
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