Residual Strain Monitoring and Dynamic Characteristics of Hybrid Hollow Square Tube with Metal–FRP–Metal Sandwich Walls

Table 2

Material properties of the unidirectional CFRP composite and the steel square tube.

Material properties	USN 10000/T300 prepreg	AISI 1045
Longitudinal modulus, E1 (GPa)	137	200
Transverse modulus, E2 (GPa)	9	200
Shear modulus, G12 (GPa)	3.78	80
Major Poisson’s ratio, ν12	0.28	0.29
Longitudinal CTE, (10^−6/°C)	−0.5	11
Transverse CTE, (10^−6/°C)	27	11
Density (g/cm^3)	1.76	7.85