I am looking for "standard" equations, the sort that are generally
accepted and are published in books and university skripts. The
equations should apply to polymer + filler composits and polymer +
filler + cut fiber composits. The distribution of filler and fiber
segments is assumed to be evenly distributed in all directions
(isotrope). So how are the composit properties: elastic modulus and
tensile strength usually approximated? Please give me one or two
equations for each and their source.