Table 1.

Material parameters of the constitutive model for shape memory polymers.

Parameter	Notation	Value
Glass Transition Temperature	$T_g$	42.9 °C (4 °C/min)
WLF first constant	$C_1$	19.1
WLF second constant	$C_2$	58.0 °C
Structural relaxation time (at $T_g$)	${\tau }_S^o$	1573.0 s
Coefficient of thermal expansion in rubbery phase	${\alpha }_r$	8.38 × ${10}^{-4}$ °C${}^{-1}$
Coefficient of thermal expansion in glassy phase	${\alpha }_g$	1.32 × ${10}^{-4}$ °C${}^{-1}$
Equilibrium network shear modulus	${\mu }_r$	0.9 MPa
Limiting value of locking stretch	${\lambda }_L$	1.6
Glassy shear modulus	${\mu }_g$	168.9 MPa
Bulk modulus	k	543.1 MPa
Shear viscosity (at $T_g$)	${\eta }_o$	1.48 × ${10}^4$ MPa-s
Initial shear strength	$s_o$	20.17 MPa
Activation parameter	$Q/s_o$	72.0 K/MPa
Saturation shear strength ratio	$s_s/s_o$	0.7
Flow softening parameter	h	300.0 MPa