Experimental and Theoretical Study of Sandwich Panels with Steel Facesheets and GFRP Core

Table 4

Comparisons of maximum tensile and compressive stress between experimental and analytical results.

Specimen	⁢Experimental strain (ε)		⁢Experimental stress (MPa)		⁢Predicted stress (MPa)		⁢Relative error (%)
	Tensile	Compressive	Tensile	Compressive	Tensile	Compressive	Tensile	Compressive
S()-GFRP	2998	2985	40.7728	40.596	36.85	36.85	10.64	10.16
F()-GFRP	1462	1448	35.3804	35.0416	32.26	32.26	9.67	8.62
S()-GFRP	345	351	67.275	68.445	63.73	63.73	5.56	7.39
S()-GFRP	261	275	50.895	53.625	49.73	49.73	2.34	7.83
S()-GFRP	211	217	41.145	42.315	40.54	40.54	1.49	4.37
S()-GFRP	167	171	32.565	33.345	32.11	32.11	1.41	3.84

Note: the relative error is calculated based on the following formula: (results from the predicted stress − experimental stress)/experimental stress.