Research on the Size Effect of Unstable Fracture Toughness by the Modified Maximum Tangential Stress (MMTS) Criterion

Table 2

Y(α) and V(α) values obtained by the finite element method compared with values obtained by formulas of Guinea et al. and relative errors.

α0	Y(α)	V(α)	Y(α) (Guinea et al.)	V(α) (Guinea et al.)	V(α) (equation (5))	Relative error Y(α) (%)	Relative error V(α) (%)	Relative error V(α) (equation (5)) (%)
0.2	1.6216	1.4434	0.8392	1.3780	1.4434	1.24	2.10	4.75
0.3	1.7192	1.5932	1.1324	1.6008	1.5932	1.25	2.06	0.47
0.4	1.9287	2.0189	1.5204	2.0288	2.0189	1.94	0.27	0.49
0.5	2.3389	2.7754	2.0985	2.7891	2.7754	1.48	0.78	0.49
0.6	3.0536	4.1445	3.0576	4.2170	4.1445	1.54	1.65	1.72