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

Table 5

Comparisons of flexural capacity between experimental and FEM results.

Serial number of specimen	⁢Ultimate flexural capacity (kN)			⁢Ultimate displacement (mm)
	Finite element results	Experimental value	Relative error (%)	Finite element results	Experimental value	Relative error (%)
S()-GFRP	91	104	−12.5	17.82	19.87	−10.3
F()-GFRP	169	184	−8.1	14.1	15.13	−6.8
S()-GFRP	114	128	−10.9	6.53	7.13	−8.5
S()-GFRP	129	140	−7.8	5.4	5.72	−5.6
S()-GFRP	171	164	4.3	4.27	4.41	−3.2
S()-GFRP	197	212	−7.1	3.02	3.5	−13.7

Note: the relative error is calculated based on the following formula: (results from the finite element method − experimental results)/experimental values.