Experimental Investigation of the Size Effect of the Mode I Static Fracture Toughness of Limestone

Table 4

Comparison of the results of this study with the estimation results.

	Test value	True value	Estimation result (σc)	Estimation result (ρ)	Estimation result ()
Fracture toughness (MPa·m^1/2)	1.084	1.662	1.784	1.717	1.804
Relative error (%)	0	53.32	64.57	58.39	66.42