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

Table 1

Parameters for simulating three-point bending test of notched beam in Abaqus and results of simulation.

L (m)	S (m)	B (m)	H (m)	a0 (m)	α0	E (Pa)		P (Pa)	CMOD (m)	K ()	Y(α)	V(α)
2.4	2.17	0.04	1	0.2	0.2	1	0.25	4.58E − 07	4.19371E − 05	2.70E − 05	1.62	1.41
2.4	2.17	0.04	1	0.3	0.3	1	0.25	4.09E − 07	6.53230E − 05	3.14E − 05	1.72	1.63
2.4	2.17	0.04	1	0.4	0.4	1	0.25	3.35E − 07	8.82119E − 05	3.32E − 05	1.93	2.02
2.4	2.17	0.04	1	0.5	0.5	1	0.25	2.35E − 07	1.05873E − 04	3.16E − 05	2.34	2.77
2.4	2.17	0.04	1	0.6	0.6	1	0.25	1.59E − 07	1.28538E − 04	3.05E − 05	3.05	4.15

B, thickness; E, elastic modulus; , Poisson’s ratio; CMOD, crack mouth opening displacement.