Mechanical Behavior of Sandwich Panels with Hybrid PU Foam Core

Table 1

Summary of mechanical properties of GFRP laminates and the PU foam core.

Material type			Modulus of elasticity (MPa)			Strength (MPa)			Strain (%)
			Average	S.D.^1 (MPa)	C.V.^2	Average	S.D.^1 (MPa)	C.V.^2	Average	S.D.^1 (MPa)	C.V.^2
GFRP		Tensile	22680.00	88.88	0.39	291.60	2.76	0.95	1.84	0.02	0.82
		Compressive	21089.23	67.70	1.91	168.21	1.15	2.21	0.81	0.012	3.33
PU foam	150 (kg/m^3)	Shear	16.22	0.091	2.70	0.54	0.014	4.92	7.64	0.26	2.45
		Compressive	35.42	0.52	5.51	1.22	0.015	3.96	6.89	0.32	5.42
	250 (kg/m^3)	Shear	24.32	0.50	2.04	0.79	0.045	2.32	3.82	0.21	2.33
		Compressive	80.59	2.19	1.03	2.87	0.037	1.86	3.56	0.43	1.43
	350 (kg/m^3)	Shear	32.68	0.64	0.78	1.03	0.100	0.76	3.43	0.13	1.76
		Compressive	117.96	3.21	2.56	4.83	0.095	3.65	4.09	0.43	4.21

¹S.D. = standard deviation. ²C.V. = coefficient of variation (%).