E1, E2, E3	Modulus of elasticity in the x, y, z directions respectively (x is the length direction of tow, y is the width direction of tow, z is the vertical direction), MPa or GPa.
v12, v13, v23	Poisson’s ratio in different planes (xy, xz, and yz planes, respectively).
G12, G13, G13	Shear modulus in different planes (xy, xz, and yz planes, respectively), MPa or GPa
εi	Strain component, i = 1, 2, 6
Cijkl	Stiffness coefficient, i, j, k, l = 1, 2, 6
σi	Stress component, i = 1, 2, 6, Pa
Cij,Cijk,Cijkl	Stiffness tensors, i, j, k, l = 1, 2, 6
dU	Internal energy increment, J
uo	Strain energy density, J/m2
V	Volume of meso-unit, μm3
Q(U)	Total strain energy, J
Um	The internal energy of a certain meso-unit, J
Vm	The volume of a certain meso-unit, μm3
κ1	The energy scaling of macro–meso
κ2	The energy scaling of meso–micro
Uc	The accumulated internal energy in No.C meso-unit, J
Uʹc	The energy of a certain micro-system within No.C meso-unit, J
Vc	The volume of No.C meso-unit, μm3
Vʹc	The volume of a certain micro-system within No.C meso-unit, nm3
S0	The entropy value of the initial state within micro-system, J/K
St	The entropy value of the equilibrium state at time of t, J/K
T	The temperature of the external heat source, K
dQ	The heat energy absorbed by the system when it comes into contact with a heat source with a temperature of T, J
Ω	The number of micro-states
q	The sum of effective quantum states
ξ	h/2π
h	Planck’s constant
k	Boltzmann’s constant
w	The vibration frequency of particle swarm, Hz
ωL	The vibration frequency of particle in the space of L, Hz
g(ω)	The distributionfunction of ω
p	The pressureofthe micro-system, MPa
N	The number of particles in the micro-system
D	Diffusion coefficient
r(t)	The atomic position in the moment of t
r(0)	The original position of atom, m2/s
Einteraction	Adsorption energy, J
Etotal	Total energy of micro-system, J
Esurface	Energy of fiber layer, J
Epolymer	Energy of matrix layer, J