Applicability of the Modified Ritchie-Knott-Rice Failure Criterion to Examine the Feasibility of Miniaturized Charpy Type SE(B) Specimens

Table 2

Fracture toughness test results of 10t SE(B) specimens (S55C steel, 20°C). Here, and denote the mean and standard deviation of each parameter, respectively. Though was smaller than 30, cleavage fracture with negligible stable crack extension was observed.

Specimen id	1	2			2/%
	0.54	0.54	0.54	0
(kN)	4.46	4.25	4.36	0.105
(MPam^1/2)	54.2	51.6	52.9	1.30
(N/mm)	79.8	68.1	74.0	5.85
(MPam^1/2)	134	124	129	5.00	7.75
(mm)	0.13	0.02	0.075	0.055
	22.7	26.6	24.7	1.95