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. Author manuscript; available in PMC: 2019 Dec 1.
Published in final edited form as: Z Angew Math Mech. 2018 Mar 23;98(12):2048–2071. doi: 10.1002/zamm.201700302
ρ^α
Mass density of constituent α: current mass of constituent α per unit current volume of constituent α kg · m−3
W^α
Volume-specific strain energy function of constituent α: current strain energy of constituent α per unit current volume of constituent α J · m−3
W^mα
Mass-specific strain energy function of constituent α: current strain energy of constituent α per unit current mass of constituent α J · kg−1